CA2073243A1 - Localized heat transfer device - Google Patents
Localized heat transfer deviceInfo
- Publication number
- CA2073243A1 CA2073243A1 CA002073243A CA2073243A CA2073243A1 CA 2073243 A1 CA2073243 A1 CA 2073243A1 CA 002073243 A CA002073243 A CA 002073243A CA 2073243 A CA2073243 A CA 2073243A CA 2073243 A1 CA2073243 A1 CA 2073243A1
- Authority
- CA
- Canada
- Prior art keywords
- bladder
- fluid
- pump
- pad
- conduit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F7/02—Compresses or poultices for effecting heating or cooling
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0054—Heating or cooling appliances for medical or therapeutic treatment of the human body with a closed fluid circuit, e.g. hot water
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/12—General characteristics of the apparatus with interchangeable cassettes forming partially or totally the fluid circuit
- A61M2205/127—General characteristics of the apparatus with interchangeable cassettes forming partially or totally the fluid circuit with provisions for heating or cooling
Abstract
The invention provides systems for topically heating or cooling an animal or human body, and more particularly concerns a modular system in which a heating or cooling liquid is circulated in a hermetically sealed flow path (6, 9, 6, 7) between a heating or cooling device (21) and a heating or cooling pad (5). In a preferred embodiment, the flow path includes a cassette which is reversibly engageable with a pump (15) and a heating or cooling unit located in a housing (1).
Description
~ MCRT:001 LO~ALIZED HEAT TRANSFER DEVICE
The present invention relates to systems for lo topically heating or cooling an animal or human body.
The invention more particularly concerns such a system in which a heating or cooling liquid is circulated in a hermetically sealed flow path between a heating or cooling device and a heating or cooling pad. In an especially preferred form, the flow path includes a cassette or similar cartridge which is engageable with a pump and a heating or cooling unit. The flow path is permanently sealable and precludes a need for joints, couplings or similar fluid connectors for assembling and disassembling the flow path.
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Localized hyperthermia or hypothermia (topical application of heat or cold, respectively, to selected regions of the body) is used to treat a wide variety of medical/surgical conditions in hospitals, nursing homes, and other care giving locations and is becoming increasingly important in areas such as home health care and sports medicine. Thrombophlebitis, cellulitis, decubitus ulcerations, incisional pain and swelling, post-partum and post-operative pain and swelling, muscle pathology and pain, and joint pathology and pain are some common medical/surgical conditions for which localized hypothermia or hyperthermia can be an effective adjunctive therapy.
Techniques that deliver localized hypothermia or hyperthermia can be classified as moist or dry. With the ~;
moist technique, a hyd~ated surface is in direct or indirect contact with the body; with the dry technique, a ' ' '. -': ., ' '' : `~ . ' : ' .:: .: . - -. :. :.. .
: , , dry surface is in direct or indirect contact with the body. Devices that deliver localized hypothermia or hyperthermia can be characterized as continuous or intermittent. They may be referred to generically as thermiatric devices or units. Continuous devices draw their energy from various types of electrical power sources. Intermittent devices typically draw their energy from anything buy electrical power sources, i.e., exothermic/endothermic and chemical systems.
Localized, heat transfer devices known to those of skill in the art include simple devices, such as hot-water bottles and ice packs, as well as somewhat more sophisticated electromechanical systems.
One commercially available, single use system comprises an enclosed rupturable membrane separating two or more chemicals. The application of pressure to the ~-membrane causes it to rupture, allowing the chemicals to mix in an endothermic or exothermic reaction. The net effect is a bag that absorbs heat from or adds heat to the body. Although this system can be effective and ;~
practical when localized short-term cooling or heating of the body is desired, it is not reùsable and does not deliver constant uniform controlled heating and cooling.
The electrical heat lamp is another system used to add heat to a specific region of the body. Although many commercially available heat lamps have electrical systems that allow one to control the intensity of the light bulb and thereby control temperature, those systems are cumbersome and do not deliver uniform or site specific controlled heating.
More complicated systems require assembly and comprise a flexible polymeric applicator pad which has an inlet port and an outlet port. The ports must be ' ~ . ' . , ' " , ' , , .,. . ' reversibly connected, through a series of individual tubes, to a central fluid reservoir located in a separate housing. With these systems, the housing will contain a mechanism for heating or cooling the fluid in the reservoir and for circulating the fluid through the reservoir and into the applicator pad. For example, U.S.
Patent No. 4,459,468 describes an electromechanical controlled-temperature fluid circulating system designed for assembly to and use in reversible combination with a flexible thermal blanket or pad. This type of system comprises a fluid reservoir, heat transfer elements, temperature control circuitry, power supply, pump, and inlet and outlet ports reversibly connected to two flexible tubes that, in turn, connect the system to the pad. The reservoir contains a fluid, usually water, that can be heated or cooled by the heat transfer elements disposed within or adjacent the reservoir. The temperature of the fluid is monitored by the temperature control circuitry, which, in turn, is electrically connected to thermal modules that can be activated to maintain a desired fluid temperature. A pump is connected between the reservoir and the inlet and outlet ports. The inlet and outlet ports much be connected to two tubes for transferring fluid to an additional set of ports, disposed in the separate flexible applicator pad.
The system must be reversibly assembled prior to use by coupling the pad to the two tubes, which are in turn, connected to the ports in the housing, which contains the reservoir and pump.
A system described in U.S. Pa~ent No. 3,967,627 also has a fluid reservoir or standpipe, which is vented to the atmosphere, a heat exchanger with control circuitry, a peristaltic pump, and inlet and outlet ports. With this system, the heat transfer fluid is stored and maintained in the vented reservoir, and a peristaltic pump is used to force the fluid to flow through a heat . : ;- -: ~ : ,..... . . ..
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exchanger, where the fluid temperature is sensed and regulated, to the outlet port. For assembly, the latter may be reversibly connected to a tube which may be reversibly connected to yet an additional port located in the applicator pad. As with the device set forth in U.S.
Patent No. 4,459,468, the system must be reversibly assembled prior to use by coupling the pad to conduits, which are in turn connected to the ports in the housing.
It can readily be seen that with devices of the types described above, the applicator pad is initially fluidless and, when the pad is not is use, the inlet and outlet ports are open to the atmosphere, preventing maintenance of sterile conditions within the pad. When one desires to use the pad, the ports must be reversibly coupled to a pair of intermediate conduits. The conduits are, in turn, reversibly connected to another pair of ports mounted on the housing.
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Such systems are inefficient, messy, and in some cases hazardous to use. First, the reversible coupling of the applicator pad to the fluid circulating system is cumbersome and time consuming. The devices have multiple fluid couplings, which must be manually connected and often leak, thereby preventing one from maintaining the circulating fluid as sterile. Inexactly fitted connections result in fluid leakage at the couplings, for example, between the inlet and outlet ports of the applicator pad and the intermediate tubing and between the tubing and the ports leading to the fluid reservoir.
Additionally, when the system is disassembled after use, additional fluid leaks from the applicator pad and the - intermediate tubing that connects the fluid circulating system to the applicator pad. This leakage increases the potential for electrical shock and spread of disease, particularly nosocomial infections, as contaminated fluid leaks onto the patient's bed or body parts to which the .. : , . ~, ~ - - . . , ,: ,,. ~ . . . . . .
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pad is applied, often a recent surg cal wound. It also reduces the volume of fluid in the reservoir and, in conjunction with the venting, necessitates frequent refilling of the fluid reservoir.
Second, the efficiency of systems having vented reservoirs and orientation dependent pumps is contingent on the proper placement of the fluid circulating system relative to the applicator pad. If the elevation of the fluid circulating system is the same as that of the applicator pad, the systems may function normally.
However, as the difference between the elevation of the fluid circulating system and the elevation of the applicator pad increases, the efficiency of the system decreases. Moreover, because the reservoirs are vented, any tilting of the fluid circulating system may cause fluid to leak or spill. Fluid can also evaporate from the vented reservoir; hence, the fluid level requires constant monitoring in order to allow one to maintain the proper level of circulating fluid for safe operation of the unit. Finally, the vent facilitates contamination of fluid in the reservoir. ,;
Finally, non-sterility of fluids in the reservoir and the difficulty or impossibility of cleaning or sterilizing reusable parts of the device may induce the spread of nosocomial infection, already a serious problem in most hospitals. Infectious pathogenic microorganisms (for example, those of the Pseudomonas and Sta~hylococcus species) can enter and proliferate within the system and, most often, in the reservoir. Exposure of surgical, traumatic, or pathologic wounds to these pathogens by fluid that leaks from fluid couplings, failed seams in the reservoir or applicator pad, or from the vented 3S reservoir itself, may contribute to the development of secondary infection in the individuals exposed.
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The applicator pads used in connection with such devices, for example those described in U.S. Patents Nos.
3,867,939, 4,114,620, and 4,149,541, also have a number of disadvantages. The most commonly used applicator pads are constructed of flexible polymeric sheeting, formed into conduits for fluid passage. More specifically, U.s.
Patent No. 3,867,939, describes a widely used disposable applicator pad for medical application. The pad is of a laminate construction, with outer layers of absorbent material bonded to a polymeric inner layer that forms a conduit for the passage of fluid. Because of the design of this pad, a moist or dry technique can be used when therapy is delivered. However, if the pad is soiled with urine, blood, or other substances, it must be replaced with a clean, new pad since the integral absorbent coverings are not designed to be cleaned or removed.
U.S. Patent Nos. 4,114,620 and 4,149,541 also relate to polymeric laminated applicator pads that contain internal conduits for fluid passage. Although these applicator pads are more easily cleaned than those described above, they are uncomfortable for the patient, may contribute to skin irritation and cannot ~e used for moist heat transfer.
From the discussion above, it is apparent that substantial improvement is needed in localized heat or cold transfer devices and applicator pads designed for use in conjunction with such devices. Moreover, the problems described above are not exhaustive. Instead, they are merely examples of difficulties encountered with present devices. Clearly, a new and superior heat transfer device is greatly needed.
The above-noted and other drawbacks of the prior art are addressed by providing a novel system for effecting selective heat transfer to or from a body part. The new system features a reusable or disposable operably - -; . ; , - , , ' : ~ .
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connectionless closed loop applicator module designed for efficient and convenient non-fluid communicating interface with heating and pumping elements. The modular nature of the system advantageously enables contained fluid to be sterilized and remain sterile, or sealed from the atmosphere, and allows the fluid system to be isolated from the housing. The system also reduces or eliminates the need for the undesirable assembly of often leaky connections between a fluid reservoir, applicator pads and conduits therebetween. The present invention provides an integral fluid system requiring no connection of fluid transporting conduits prior to use and in which the fluid system can be completely isolated from the housing and pump. The fluid system, accordingly, is hermetically sealable and may remain filled with fluid whether in use or not in use. The system may be portable, if desired, to facilitate convenient transfer from one location to another by the user or health care professional.
The present invention otherwise comprises a closed loop system employing fluid circulation to effect moist or dry heat transfer to or from various regions of the human or animal body. The system includes a fluid filled flexible applicator pad in connectionless linkage with a fluid circulation system and a mechanism for effecting heat transfer and exchange. Preferably, the pad is constructed of at least two sheets of flexible polymeric sheeting, constructed in such a manner that a number of passages for fluid flow are formed within the interior of the pad. These passages are integrally connected to a closed conduit of finite length. The continuous conduit is operatively interfaced with a fluidless housing having mechanisms to (1) circulate the fluid through the conduit and the pad; (2) to remove heat from or add heat to the fluid; and (3) to control these processes. In a particularly preferred embodiment, the device includes . , . , . - ~ ~. . . .
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circuitry to allow the selective control and monitoring of temperature in the system, as well as a mechanism for controlling the rate of flow through the conduit.
The invention also provides an improved applicator pad suitable for delivery of moist or dry heat or cold.
The pad has a removable, disposable or reusable outer covering affixed to one or more sides of the pad by suitable mechanical means such as snaps, zippers, or the like. This feature allows one to dispose of, replace, or clean the covering, if desired, while reusing the applicator pad.
More specifically, according to the present invention there is provided a system for effecting heat transfer to or from a selected region of the body, comprising an (a) applicator module including a pad having a plurality of flow passages therein, and a closed loop conduit that is integrally joined in fluid communicating relation to the pad so as to permit circulation of a fluid through the flow passages of the pad and the conduit; (b) a housing, having a pump and a heat exchanger operably mounted in the housing; and (c) a mechanism for reversibly engaging the conduit with the housing so as to allow the heat exchanger to selectively heat or cool fluid within the conduit and to allow the pump to circulate fluid through the conduit and flow passages of the pad. In an additional novel and more preferred embodiment, the applicator module includes a cassette that is joined, preferably integrally, in fluid communicating relation to the conduit. The cassette includes a mechanism, device or area for interfacing with the heat exchanger to allow selective transfer of heat or cold from the heat exchanger to a fluid in the cassette.
Similarly, the cassette includes a mechanism for operably interfacing with the pump in such manner as to allow the pump to pump fluid through the cassette. Preferably, the .
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cassette also includes a mechanism that allows convenient reversible engagement with the housing.
In one preferred embodiment, ~he pump comprises a peristaltic pump and the mechanism for interfacing with the pump comprises a flexible tube. Preferably, the heat exchanger comprises a thermoelectric heat pump. A
related embodiment includes a pump that circulates fluid through the conduit by peristaltic action and a heat exchanger that comprises a thermoelectric heat pump for ,;
producing heat when an electrical potential of one polarity is applied and for absorbing heat when an electrical potential of the opposite potential is applied. In this embodiment, the housing includes a control circuit, which has a temperature sensor for detecting and responding to the temperature of the fluid and which controls the polarity and duration of application of an electrical potential to the thermoelectric heat pump.
In yet an additional embodiment, the cassette defines a plurality of fluid transporting channels that are connected to a bladder in a manner that will allow flow of fluid from the channels to the bladder. The bladder may be a single bladder, or in a preferred embodiment, a series of bladders. An inlet valve and an outlet valve are interposed between the bladder or bladders and the channels. The inlet valve allows fluid to flow into the bladder when fluid pressure inside the bladder is less than the fluid pressure in the channel adjoining the inlet valve, and the outlet valve allows fluid to flow from the bladder when fluid pressure inside the bladder is greater than the fluid pressure in the channels. With this embodiment, the pump functions by alternately increasing and decreasing fluid pressure in the bladder. In a more version of this apparatus, the pump intermittently increases fluid pressure in the :.:: ,, , : - . . :
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bladder by intermittently compressing the bladder, which comprises resilient means, for example, a sponge or spring, for expanding the bladder after compression by the pump.
In a further refinement, the cassette also comprises a plate mounted in such manner that the plate compresses the bladder when force is exerted against the plate. A
suitable pump for use in this system comprises a cam rotatably mounted on an axis in a position such that upon rotation about the axis the cam intermittently displaces the plate so as to intermittently compress the bladder.
With this pump, fluid does not flow through the pump, but rather through a bladder which is compressed by the pump.
The cam may be rotated by any suitable drive mechanism, preferably an electric motor. With this embodiment, the heat exchanger will preferably include a thermoelectric heat pump. The system may also include a temperature control circuit that is capable of responding to the temperature of fluid within the conduit, by controlling the polarity and duration of application of an electrical potential to the thermoelectric heat pump.
In yet a further embodiment, the cassette, which may itself be flexible, comprises a flexible bladder and the pump comprises a compression element mounted in the housing in operative relation to the bladder so that the pump is capable of intermittently compressing the bladder.
Applicator modules made according to the present invention may be either reusable or disposable, and optionally, may be capable of sterilization prior to use.
The invention also includes an improved pad for use in the applicator module. With this embodiment, are included, the pad which may include a plurality of flow . .
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passages therein, a covering for the pad, and means for reversibly affixing the covering to one or both sides of the pad in a manner such that the covering may be removed from the pad and replaced with the same or another covering. Preferably, a series of snaps is used for attachment.
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`~ Methods for topical heat or cold treatment are also provided. Thus, for example, the invention includes a lo method of topically treating an animal or human body, which comprises applying a thermiatric bladder to a part of an animal or human body, circulating a liquid through a hermetic flow path which includes the interior of the bladder, and generating a temperature differential in the liquid across the bladder. Also included is a method comprising applying a thermiatric bladder to a part of an animal or human body; peristaltically circulating a liquid through a hermetic flow path which includes the bladder; and changing the temperature of the lîquid at a point in the flow path removed from the bladder.
Figure 1: Figure 1 is a perspective view of a ; housing and applicator module.
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Figure 2: Figure 2 is an exploded enlarged view of ' a fragment of an applicator pad.
' ' Figure 3: Figure 3 is a perspective, partially cutaway, view of an embodiment comprising a housing and 30 cassette constructed in accordance with the invention.
Figure 4: Figure 4 is an enlarged view of a peristaltic pump.
Figure 5: Figure 5 shows the device of Figure 3, partially in phantom, as assembled for operation.
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Figure 6: Figure 6 is a partially cutaway, sectional view of a cassette, taken along section line 6-6 in Figure 7.
Figure 7: Figure 7 is a perspective, partially cutaway, view of an embodiment comprising a housing and cassette constructed in accordance with the invention.
Figure 1 depicts a general overall view of the present invention. In the device shown, there are a housing 1 and an applicator module 2 for applying heat or cold to a selected bod~ part of an animal or human. The housing comprises a pump and a heat exchanger, which are described in more detail below. The applicator module 2 comprises a closed loop fluid circulation system including an applicator pad 5, a conduit 6, and preferably, a cassette 7 interposed in the conduit. In a preferred embodiment, the cassette 7 is designed to reversibly or retractably engage with the housing and to ~, 20 functionally interface with the pump and heat exchanger.
Each of these parts is discussed in more detail below.
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As shown in Fig. 2, the pad preferably comprises at least two flexible sheets 7 sealed together along their peripheral edges to form a bag or bladder. The sheets ~ are preferably further sealed together so as to form a i series of interconnected fluid passageways 9 therebetween. The pad may be made of any suitable flexible material that is resistant to tear or puncture and yet allows efficient heat transfer. Such materials may include but are not limited to plastic or polymeric materials like polyethylene or vinyl polymers. The pad may be disposable or reusable, and it may be flat or contoured to fit a part of the body.
In a preferred embodiment, the pad element of the applicator module may include a mechanism 10 for "j ,,~ ~ .
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. ., -reversibly attaching a lightweight pad cover 11 or covers to the external surface of one or both sides of the pad.
The attachment device depicted in Fig. 2 comprises a groove or series of grooves 12 extending along the periphery and/or other locations on the pad that are designed to reversibly engage a corresponding tongue or -series of tongues 13 projecting from the surface of the pad cover or vice versa. Other attachment devices such as snaps, zippers, buttons an the like could also be used. With an attachment device similar to that shown in the drawing, however, the pad cover 11 can be attached to the pad by aligning the tongues 13 in corresponding grooves 12 and then applying pressure to engage the tongue in groove mechanism. Similarly, with a "snap on"
attachment mechanism, the covering and pad will each include a plurality of corresponding snaps and the cover may simply be "shaped" onto the pad. Alternatively, adhesive strips, e.g., made of "Velcro" or a similar material may be used.
Preferably, the pad cover 11 will be made of a material that is soft to the touch, non-irritating to the skin, lightweight, and affords efficient heat transfer but also is resistant to wear, tearing, and puncture.
Suitable pad coverings include, for example, absorbent material or man-made fabrics such as cottons and non-woven materials. The pad cover 11 may also be designed to allow for dry or moist heat or cold transfer; if moist heat transfer is desired, an absorbent material such as polymeric woven and non-woven material or cottons may be most suitable. Preferably, the material used for manufacture of pad cover 11 will be sufficiently inexpensive so that the pad cover can be disposed of as soiled or after a single use, if desired. In an alternate embodiment, however, the pad cover may be made of a material that can be cleaned and reused. Such a material might be a cotton cloth to which a polymeric . . . . - -. - . .
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i material with a tongue or groove is attached around the periphery or at another strategic location.
The novel reversible engagement between pad cover 11 ; 5 and pad 5 provides the advantage of allowing the pad and pad cover to be dispensed and transported as a unit. It also allows the pad cover to be changed or cleaned, when it becomes soiled without requiring disposal or removal ;- of the pad or any portion of the applicator module.
Alternatively, a pad having a covering irreversibly glued, fused, or affixed to its surface (see, e.g., U.S.
Patent # 3,867,939) may be used with the device shown.
Unfortunately, such pads do not afford a number of the advantages of the novel pad and pad cover set described herein and thus are less preferred for use.
Returning now to Fig. 1, it should be noted that the applicator pad 5 is integrally or hermetically connected , to the closed loop conduit 6 in such manner as to allow free flow of fluid from passageways 9 in the pad through the conduit 6 and vice versa. By integrally connecting the pad and the closed loop conduit, one reduces or ` avoids the need for threaded joints or other mechanical connectors typically needed to fill and make up a pad.
` 25 The hermetic nature of the integrated structure greatly reduces the inconvenience of assembly and the potential for leaks and contamination of fluid in the pad.
Consequently, patients are much less likely to develop nosocomial infections when using the pads of the invention.
The conduit 6 may be made of a number of plastic or rubber materials that preferably are resistant to kinking and deformation that causes decreased flow through the conduit. The conduit is preferably flexible and compressible. The conduit may be designed so as to directly interface with the pump and heat exchanger in a .
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manner that allows efficient transfer of heat to or from fluid in the conduit and circulation of such fluid through the conduit and passages of the pad.
In an embodiment that is highly preferred, the applicator module also comprises a cassette 7, which is joined in fluid communicating relation to the conduit.
Thus, in the embodiment shown, the applicator pad 5, conduit 6, and cassette 7 are integrally linked to comprise a closed loop system for fluid circulation, which may be filled with fluid and sterilized as a unit if desired.
In the device shown in Fig. 1, various cassettes 7 are designed to interface the housing, e.g. by insertion into a slot or opening in the body of the housing, in such a manner as to allow operative interface between the cassette heat exchanger and pump mounted in the housing 1. The cassette may have a variety of forms, three of which are described in more detail below.
~igure 3 illustrates a cassette that comprises a flexible region of conduit 14 designed so as to interface with a peristaltic pump 15, which is shown in more detail in Fig. 4. The peristaltic pump comprises a plurality of freely rotatable orbital rollers 16 mounted between end plates 17 driven in rotation by a shaft 18. The flexible section of conduit 14 is arranged in a race through the pump which is spaced from the outer ends of the rollers 16 a distance sufficient to permit collapse of the conduit 14 as the shaft 18 turns. The orbital rollers 16 are moved to first compress the flexible conduit 14, therehy forcing a quantum of fluid trapped in it along the direction of movement of the orbital rollers 16 and causing movement cf fluid through the closed loop system.
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-16- ;, As shown in Figs. 3 and 5, the cassette also includes a heat exchange element 20, which may simply comprise an additional section of a flexible or rigid material such as plastic tubing or maybe made of a variety of different materials specifically designed to enhance heat transfer, such as copper or aluminum, or a polymer with efficient heat transfer characteristics.
The heat exchange element is designed to contact or engage a heat exchanger 21 mounted in the housing in such lo manner as to allow effective transfer of heat or cold from the heat exchanger to the heat exchange element.
Preferably, the heat exchanger 21 is bifunctional and can be used for selective delivery of either heat or cold. However, devices capable of delivering only heat or only cold are also included within the scope of the invention. A number of suitable heat exchangers may be used, including, for example, electric resistor heat ` exchanger, mechanical heat pump, absorption - 20 refrigerator~, or thermoelectric resistor strips.
However, a thermoelectric heat pump or a bank of thermoelectric heat pumps connected in branches or in series capable of selectively delivering heat to or 7 removing heat from the system is preferred. Solid state thermoelectric heat pumps have numerous advantages over separate heating and cooling systems. Generally, thermoelectric heat pumps operate by radiating heat when an electrical potential of one polarity is applied thereto and absorbing heat when an electrical potential of the opposite polarity is applied thereto. A
thermoelectric heat pump may be configured as a flat ~, plate or plates disposed in heat communicating relation to one or both surfaces of the heat exchange interface element 20. Particularly preferred is a heat pump of the type sold by Marlow Industries, Inc. Dallas, Texas.
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In an alternative embodiment, shown in Figs. 6 and 7, the cassette 7 defines a fluid transporting channel or channels 22 interconnected to a bladder or bladders 23 by an inlet valve 24 and an outlet valve 25. The design of S inlet valve 24 allows fluid to flow into the bladder 23 when the fluid pressure inside the bladder is less than the fluid pressure in the channel; similarly, outlet valve 25 allows fluid to flow from the bladder when the -fluid pressure inside the bladder 23 is greater than fluid pressure in the channels 22. Valves of the type commonly known as check valves are preferred, however - other suitable valves would include those known as "one- ~-` way valves" of flutter valves.
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The cassette shown in Fig. 7 comprises a series of - two tandem bladders, each of which has at least one plate e 26 formed of a relatively rigid material such as aluminum or hard plastic. The plate 26 is mounted in such a manner as to allow it to be displaced into the body or cavity of the bladder when force is exerted against it ~i from the exterior of the bladder and, conversely, to -~ allow it to return to its precompression position when l the force is removed. Preferably, the bladder 23 also comprises a resilient member 27 for facilitating or effecting the latter function. In a preferred l embodiment, this resilient member will comprise a sponge `l disposed inside the cavity defined by the bladder;
however, springs or other resilient means could also be used.
The pump functions by intermittently displacing the plate 26, thereby compressing the bladder, and causing fluid flow through the channels defined by the cassette, the conduit and the flow passages of the pad. The pump may, for example, comprise a motor driven cam 28 rotatably mounted on an axis 29 in a manner such that rotation of the cam about its axis alternatively exerts .
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and releases a force against plate 26 so as to cause intermittent compression of the bladder. When the bladder is compressed, the fluid pressure in the bladder is greater than the fluid pressure in the channels so that outlet valve 25 is forced open while inlet valve 24 at the other end is closed and fluid flows from the ` chamber or bladder into the channels located in the cassette. Preferably, when tandem bladders are present, the bladders will be compressed in alternating fashion so as to provide a more even flow of fluid through the closed loop system. Additional bladders may be added if desired.
, In the embodiment shown, the heat exchanger 21 may ; 15 be designed so as to interface with the cassette at one or both sides of bladder 23, but preferably with the side of the bladder opposite the plate 26. In a preferred embodiment, the heat exchanger 21 comprises a flat surface lying adjacent the side of the bladder opposite plate 26. Accordingly, it is preferred that the surface of the bladder adjacent the heat exchanger by made of a material conducive to efficient heat transfer such as copper or aluminum.
In yet a further embodiment, the cassette may be made of a flexible polymeric material and thereby comprise a flexible cassette, having a bladder or a series of bladders in tandem. Like the embodiments shown in Figures 6 and 7, the flexible cassette defines a fluid transporting channel or channels 22 interconnected to a bladder or bladders 23 by an inlet valve 24 and an outlet valve 25, as previously described. With the flexible cassette, valves of the type known as "flutter valves"
are preferred.
The flexible cassette differs from its counterpart shown in Figures 6 and 7 in that it will generally not . - - ... . .
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include plate 26. Instead, the plate, or another suitable compression element such as a roller bar or cam, is provided in operative relation to the bladder so as to be capable of intermittently compressing the bladder. In a preferred embodiment, the compression element includes a plate mounted on an axis in the housing in such a manner as to allow it to intermittently compress the bladder. In an even more preferred embodiment, a ` thermoelectric heat pump is affixed to the surface of the plate.
An attractive feature of all types of cassettes is the ease and convenience with which they may reversible engage or disengage the housing unit. In the embodiment shown in Figure 1, the engagement mechanism of the housing 1 comprises a slot 30 into which the cassette may be inserted. Of course, the configuration of the slot may be varied in keeping with the size and structure of the cassette. For example, with the cassette shown in ~ 20 Figure 3, one end of the housing is left open and the ;i slot 30 extends a distance into one side of the device.
Alternatively, the slot may be omitted, and the cassette 3 directly abutted to an open end of the housing. If desired, the housing and cassette may be supplemented `~ 25 ~ with additional closure devices, for example a clasp, hatch or catch 31.
As shown in Fig. 1, in addition to the pump and heat exchanger, the housing 1 preferably includes a number of other features designed to facilitate safe, efficient, reliable, and convenient operation and service of the device. Such features may include, for example, a temperature sensing mechanism 32 such as a thermistor or thermostat in temperature sensing relation to a control circuit 36 for controlling the temperature in the system, a plate panel 33, having an on-off switch 34, and a hot-cold switch for controll1ng the heat exchanger and adding .
., . ' ~ ' ' -' ' ' ' ~: : --20- ~ , or removing heat from the system 35. Suitable examples of those features are well known in the art.
Preferably, both the pump and the heat exchanger are electrically powered. Therefore, the housing may also include an electrical connection 37 for imputing power to the system from a battery, electrical outlet or other power source such as an automobile cigarette lighter.
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The foregoing description of the invention has been directed to particular preferred embodiments in accordance with the requirements of the patent statutes and for purposes of explanation and illustration. It will be apparent, however, to those skilled in the art that many modifications and changes may be made without departing from the scope and the spirit of the invention.
. .
¢ 20 For example, numerous heat exchanger, pumps and ~ housing configurations may be used. In addition, the i form of cassettes utilized may vary from the devices set forth in the drawings. It is apparent that the invention may also be utilized, with other suitable modifications within the state of the art. It is intended in the following claims to cover all such equivalent modifications and variations which fall within the spirit ~nd scope of tho invontlon.
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The present invention relates to systems for lo topically heating or cooling an animal or human body.
The invention more particularly concerns such a system in which a heating or cooling liquid is circulated in a hermetically sealed flow path between a heating or cooling device and a heating or cooling pad. In an especially preferred form, the flow path includes a cassette or similar cartridge which is engageable with a pump and a heating or cooling unit. The flow path is permanently sealable and precludes a need for joints, couplings or similar fluid connectors for assembling and disassembling the flow path.
:
Localized hyperthermia or hypothermia (topical application of heat or cold, respectively, to selected regions of the body) is used to treat a wide variety of medical/surgical conditions in hospitals, nursing homes, and other care giving locations and is becoming increasingly important in areas such as home health care and sports medicine. Thrombophlebitis, cellulitis, decubitus ulcerations, incisional pain and swelling, post-partum and post-operative pain and swelling, muscle pathology and pain, and joint pathology and pain are some common medical/surgical conditions for which localized hypothermia or hyperthermia can be an effective adjunctive therapy.
Techniques that deliver localized hypothermia or hyperthermia can be classified as moist or dry. With the ~;
moist technique, a hyd~ated surface is in direct or indirect contact with the body; with the dry technique, a ' ' '. -': ., ' '' : `~ . ' : ' .:: .: . - -. :. :.. .
: , , dry surface is in direct or indirect contact with the body. Devices that deliver localized hypothermia or hyperthermia can be characterized as continuous or intermittent. They may be referred to generically as thermiatric devices or units. Continuous devices draw their energy from various types of electrical power sources. Intermittent devices typically draw their energy from anything buy electrical power sources, i.e., exothermic/endothermic and chemical systems.
Localized, heat transfer devices known to those of skill in the art include simple devices, such as hot-water bottles and ice packs, as well as somewhat more sophisticated electromechanical systems.
One commercially available, single use system comprises an enclosed rupturable membrane separating two or more chemicals. The application of pressure to the ~-membrane causes it to rupture, allowing the chemicals to mix in an endothermic or exothermic reaction. The net effect is a bag that absorbs heat from or adds heat to the body. Although this system can be effective and ;~
practical when localized short-term cooling or heating of the body is desired, it is not reùsable and does not deliver constant uniform controlled heating and cooling.
The electrical heat lamp is another system used to add heat to a specific region of the body. Although many commercially available heat lamps have electrical systems that allow one to control the intensity of the light bulb and thereby control temperature, those systems are cumbersome and do not deliver uniform or site specific controlled heating.
More complicated systems require assembly and comprise a flexible polymeric applicator pad which has an inlet port and an outlet port. The ports must be ' ~ . ' . , ' " , ' , , .,. . ' reversibly connected, through a series of individual tubes, to a central fluid reservoir located in a separate housing. With these systems, the housing will contain a mechanism for heating or cooling the fluid in the reservoir and for circulating the fluid through the reservoir and into the applicator pad. For example, U.S.
Patent No. 4,459,468 describes an electromechanical controlled-temperature fluid circulating system designed for assembly to and use in reversible combination with a flexible thermal blanket or pad. This type of system comprises a fluid reservoir, heat transfer elements, temperature control circuitry, power supply, pump, and inlet and outlet ports reversibly connected to two flexible tubes that, in turn, connect the system to the pad. The reservoir contains a fluid, usually water, that can be heated or cooled by the heat transfer elements disposed within or adjacent the reservoir. The temperature of the fluid is monitored by the temperature control circuitry, which, in turn, is electrically connected to thermal modules that can be activated to maintain a desired fluid temperature. A pump is connected between the reservoir and the inlet and outlet ports. The inlet and outlet ports much be connected to two tubes for transferring fluid to an additional set of ports, disposed in the separate flexible applicator pad.
The system must be reversibly assembled prior to use by coupling the pad to the two tubes, which are in turn, connected to the ports in the housing, which contains the reservoir and pump.
A system described in U.S. Pa~ent No. 3,967,627 also has a fluid reservoir or standpipe, which is vented to the atmosphere, a heat exchanger with control circuitry, a peristaltic pump, and inlet and outlet ports. With this system, the heat transfer fluid is stored and maintained in the vented reservoir, and a peristaltic pump is used to force the fluid to flow through a heat . : ;- -: ~ : ,..... . . ..
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exchanger, where the fluid temperature is sensed and regulated, to the outlet port. For assembly, the latter may be reversibly connected to a tube which may be reversibly connected to yet an additional port located in the applicator pad. As with the device set forth in U.S.
Patent No. 4,459,468, the system must be reversibly assembled prior to use by coupling the pad to conduits, which are in turn connected to the ports in the housing.
It can readily be seen that with devices of the types described above, the applicator pad is initially fluidless and, when the pad is not is use, the inlet and outlet ports are open to the atmosphere, preventing maintenance of sterile conditions within the pad. When one desires to use the pad, the ports must be reversibly coupled to a pair of intermediate conduits. The conduits are, in turn, reversibly connected to another pair of ports mounted on the housing.
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Such systems are inefficient, messy, and in some cases hazardous to use. First, the reversible coupling of the applicator pad to the fluid circulating system is cumbersome and time consuming. The devices have multiple fluid couplings, which must be manually connected and often leak, thereby preventing one from maintaining the circulating fluid as sterile. Inexactly fitted connections result in fluid leakage at the couplings, for example, between the inlet and outlet ports of the applicator pad and the intermediate tubing and between the tubing and the ports leading to the fluid reservoir.
Additionally, when the system is disassembled after use, additional fluid leaks from the applicator pad and the - intermediate tubing that connects the fluid circulating system to the applicator pad. This leakage increases the potential for electrical shock and spread of disease, particularly nosocomial infections, as contaminated fluid leaks onto the patient's bed or body parts to which the .. : , . ~, ~ - - . . , ,: ,,. ~ . . . . . .
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pad is applied, often a recent surg cal wound. It also reduces the volume of fluid in the reservoir and, in conjunction with the venting, necessitates frequent refilling of the fluid reservoir.
Second, the efficiency of systems having vented reservoirs and orientation dependent pumps is contingent on the proper placement of the fluid circulating system relative to the applicator pad. If the elevation of the fluid circulating system is the same as that of the applicator pad, the systems may function normally.
However, as the difference between the elevation of the fluid circulating system and the elevation of the applicator pad increases, the efficiency of the system decreases. Moreover, because the reservoirs are vented, any tilting of the fluid circulating system may cause fluid to leak or spill. Fluid can also evaporate from the vented reservoir; hence, the fluid level requires constant monitoring in order to allow one to maintain the proper level of circulating fluid for safe operation of the unit. Finally, the vent facilitates contamination of fluid in the reservoir. ,;
Finally, non-sterility of fluids in the reservoir and the difficulty or impossibility of cleaning or sterilizing reusable parts of the device may induce the spread of nosocomial infection, already a serious problem in most hospitals. Infectious pathogenic microorganisms (for example, those of the Pseudomonas and Sta~hylococcus species) can enter and proliferate within the system and, most often, in the reservoir. Exposure of surgical, traumatic, or pathologic wounds to these pathogens by fluid that leaks from fluid couplings, failed seams in the reservoir or applicator pad, or from the vented 3S reservoir itself, may contribute to the development of secondary infection in the individuals exposed.
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The applicator pads used in connection with such devices, for example those described in U.S. Patents Nos.
3,867,939, 4,114,620, and 4,149,541, also have a number of disadvantages. The most commonly used applicator pads are constructed of flexible polymeric sheeting, formed into conduits for fluid passage. More specifically, U.s.
Patent No. 3,867,939, describes a widely used disposable applicator pad for medical application. The pad is of a laminate construction, with outer layers of absorbent material bonded to a polymeric inner layer that forms a conduit for the passage of fluid. Because of the design of this pad, a moist or dry technique can be used when therapy is delivered. However, if the pad is soiled with urine, blood, or other substances, it must be replaced with a clean, new pad since the integral absorbent coverings are not designed to be cleaned or removed.
U.S. Patent Nos. 4,114,620 and 4,149,541 also relate to polymeric laminated applicator pads that contain internal conduits for fluid passage. Although these applicator pads are more easily cleaned than those described above, they are uncomfortable for the patient, may contribute to skin irritation and cannot ~e used for moist heat transfer.
From the discussion above, it is apparent that substantial improvement is needed in localized heat or cold transfer devices and applicator pads designed for use in conjunction with such devices. Moreover, the problems described above are not exhaustive. Instead, they are merely examples of difficulties encountered with present devices. Clearly, a new and superior heat transfer device is greatly needed.
The above-noted and other drawbacks of the prior art are addressed by providing a novel system for effecting selective heat transfer to or from a body part. The new system features a reusable or disposable operably - -; . ; , - , , ' : ~ .
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connectionless closed loop applicator module designed for efficient and convenient non-fluid communicating interface with heating and pumping elements. The modular nature of the system advantageously enables contained fluid to be sterilized and remain sterile, or sealed from the atmosphere, and allows the fluid system to be isolated from the housing. The system also reduces or eliminates the need for the undesirable assembly of often leaky connections between a fluid reservoir, applicator pads and conduits therebetween. The present invention provides an integral fluid system requiring no connection of fluid transporting conduits prior to use and in which the fluid system can be completely isolated from the housing and pump. The fluid system, accordingly, is hermetically sealable and may remain filled with fluid whether in use or not in use. The system may be portable, if desired, to facilitate convenient transfer from one location to another by the user or health care professional.
The present invention otherwise comprises a closed loop system employing fluid circulation to effect moist or dry heat transfer to or from various regions of the human or animal body. The system includes a fluid filled flexible applicator pad in connectionless linkage with a fluid circulation system and a mechanism for effecting heat transfer and exchange. Preferably, the pad is constructed of at least two sheets of flexible polymeric sheeting, constructed in such a manner that a number of passages for fluid flow are formed within the interior of the pad. These passages are integrally connected to a closed conduit of finite length. The continuous conduit is operatively interfaced with a fluidless housing having mechanisms to (1) circulate the fluid through the conduit and the pad; (2) to remove heat from or add heat to the fluid; and (3) to control these processes. In a particularly preferred embodiment, the device includes . , . , . - ~ ~. . . .
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circuitry to allow the selective control and monitoring of temperature in the system, as well as a mechanism for controlling the rate of flow through the conduit.
The invention also provides an improved applicator pad suitable for delivery of moist or dry heat or cold.
The pad has a removable, disposable or reusable outer covering affixed to one or more sides of the pad by suitable mechanical means such as snaps, zippers, or the like. This feature allows one to dispose of, replace, or clean the covering, if desired, while reusing the applicator pad.
More specifically, according to the present invention there is provided a system for effecting heat transfer to or from a selected region of the body, comprising an (a) applicator module including a pad having a plurality of flow passages therein, and a closed loop conduit that is integrally joined in fluid communicating relation to the pad so as to permit circulation of a fluid through the flow passages of the pad and the conduit; (b) a housing, having a pump and a heat exchanger operably mounted in the housing; and (c) a mechanism for reversibly engaging the conduit with the housing so as to allow the heat exchanger to selectively heat or cool fluid within the conduit and to allow the pump to circulate fluid through the conduit and flow passages of the pad. In an additional novel and more preferred embodiment, the applicator module includes a cassette that is joined, preferably integrally, in fluid communicating relation to the conduit. The cassette includes a mechanism, device or area for interfacing with the heat exchanger to allow selective transfer of heat or cold from the heat exchanger to a fluid in the cassette.
Similarly, the cassette includes a mechanism for operably interfacing with the pump in such manner as to allow the pump to pump fluid through the cassette. Preferably, the .
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cassette also includes a mechanism that allows convenient reversible engagement with the housing.
In one preferred embodiment, ~he pump comprises a peristaltic pump and the mechanism for interfacing with the pump comprises a flexible tube. Preferably, the heat exchanger comprises a thermoelectric heat pump. A
related embodiment includes a pump that circulates fluid through the conduit by peristaltic action and a heat exchanger that comprises a thermoelectric heat pump for ,;
producing heat when an electrical potential of one polarity is applied and for absorbing heat when an electrical potential of the opposite potential is applied. In this embodiment, the housing includes a control circuit, which has a temperature sensor for detecting and responding to the temperature of the fluid and which controls the polarity and duration of application of an electrical potential to the thermoelectric heat pump.
In yet an additional embodiment, the cassette defines a plurality of fluid transporting channels that are connected to a bladder in a manner that will allow flow of fluid from the channels to the bladder. The bladder may be a single bladder, or in a preferred embodiment, a series of bladders. An inlet valve and an outlet valve are interposed between the bladder or bladders and the channels. The inlet valve allows fluid to flow into the bladder when fluid pressure inside the bladder is less than the fluid pressure in the channel adjoining the inlet valve, and the outlet valve allows fluid to flow from the bladder when fluid pressure inside the bladder is greater than the fluid pressure in the channels. With this embodiment, the pump functions by alternately increasing and decreasing fluid pressure in the bladder. In a more version of this apparatus, the pump intermittently increases fluid pressure in the :.:: ,, , : - . . :
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bladder by intermittently compressing the bladder, which comprises resilient means, for example, a sponge or spring, for expanding the bladder after compression by the pump.
In a further refinement, the cassette also comprises a plate mounted in such manner that the plate compresses the bladder when force is exerted against the plate. A
suitable pump for use in this system comprises a cam rotatably mounted on an axis in a position such that upon rotation about the axis the cam intermittently displaces the plate so as to intermittently compress the bladder.
With this pump, fluid does not flow through the pump, but rather through a bladder which is compressed by the pump.
The cam may be rotated by any suitable drive mechanism, preferably an electric motor. With this embodiment, the heat exchanger will preferably include a thermoelectric heat pump. The system may also include a temperature control circuit that is capable of responding to the temperature of fluid within the conduit, by controlling the polarity and duration of application of an electrical potential to the thermoelectric heat pump.
In yet a further embodiment, the cassette, which may itself be flexible, comprises a flexible bladder and the pump comprises a compression element mounted in the housing in operative relation to the bladder so that the pump is capable of intermittently compressing the bladder.
Applicator modules made according to the present invention may be either reusable or disposable, and optionally, may be capable of sterilization prior to use.
The invention also includes an improved pad for use in the applicator module. With this embodiment, are included, the pad which may include a plurality of flow . .
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passages therein, a covering for the pad, and means for reversibly affixing the covering to one or both sides of the pad in a manner such that the covering may be removed from the pad and replaced with the same or another covering. Preferably, a series of snaps is used for attachment.
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`~ Methods for topical heat or cold treatment are also provided. Thus, for example, the invention includes a lo method of topically treating an animal or human body, which comprises applying a thermiatric bladder to a part of an animal or human body, circulating a liquid through a hermetic flow path which includes the interior of the bladder, and generating a temperature differential in the liquid across the bladder. Also included is a method comprising applying a thermiatric bladder to a part of an animal or human body; peristaltically circulating a liquid through a hermetic flow path which includes the bladder; and changing the temperature of the lîquid at a point in the flow path removed from the bladder.
Figure 1: Figure 1 is a perspective view of a ; housing and applicator module.
' .
Figure 2: Figure 2 is an exploded enlarged view of ' a fragment of an applicator pad.
' ' Figure 3: Figure 3 is a perspective, partially cutaway, view of an embodiment comprising a housing and 30 cassette constructed in accordance with the invention.
Figure 4: Figure 4 is an enlarged view of a peristaltic pump.
Figure 5: Figure 5 shows the device of Figure 3, partially in phantom, as assembled for operation.
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Figure 6: Figure 6 is a partially cutaway, sectional view of a cassette, taken along section line 6-6 in Figure 7.
Figure 7: Figure 7 is a perspective, partially cutaway, view of an embodiment comprising a housing and cassette constructed in accordance with the invention.
Figure 1 depicts a general overall view of the present invention. In the device shown, there are a housing 1 and an applicator module 2 for applying heat or cold to a selected bod~ part of an animal or human. The housing comprises a pump and a heat exchanger, which are described in more detail below. The applicator module 2 comprises a closed loop fluid circulation system including an applicator pad 5, a conduit 6, and preferably, a cassette 7 interposed in the conduit. In a preferred embodiment, the cassette 7 is designed to reversibly or retractably engage with the housing and to ~, 20 functionally interface with the pump and heat exchanger.
Each of these parts is discussed in more detail below.
1 .
As shown in Fig. 2, the pad preferably comprises at least two flexible sheets 7 sealed together along their peripheral edges to form a bag or bladder. The sheets ~ are preferably further sealed together so as to form a i series of interconnected fluid passageways 9 therebetween. The pad may be made of any suitable flexible material that is resistant to tear or puncture and yet allows efficient heat transfer. Such materials may include but are not limited to plastic or polymeric materials like polyethylene or vinyl polymers. The pad may be disposable or reusable, and it may be flat or contoured to fit a part of the body.
In a preferred embodiment, the pad element of the applicator module may include a mechanism 10 for "j ,,~ ~ .
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. ., -reversibly attaching a lightweight pad cover 11 or covers to the external surface of one or both sides of the pad.
The attachment device depicted in Fig. 2 comprises a groove or series of grooves 12 extending along the periphery and/or other locations on the pad that are designed to reversibly engage a corresponding tongue or -series of tongues 13 projecting from the surface of the pad cover or vice versa. Other attachment devices such as snaps, zippers, buttons an the like could also be used. With an attachment device similar to that shown in the drawing, however, the pad cover 11 can be attached to the pad by aligning the tongues 13 in corresponding grooves 12 and then applying pressure to engage the tongue in groove mechanism. Similarly, with a "snap on"
attachment mechanism, the covering and pad will each include a plurality of corresponding snaps and the cover may simply be "shaped" onto the pad. Alternatively, adhesive strips, e.g., made of "Velcro" or a similar material may be used.
Preferably, the pad cover 11 will be made of a material that is soft to the touch, non-irritating to the skin, lightweight, and affords efficient heat transfer but also is resistant to wear, tearing, and puncture.
Suitable pad coverings include, for example, absorbent material or man-made fabrics such as cottons and non-woven materials. The pad cover 11 may also be designed to allow for dry or moist heat or cold transfer; if moist heat transfer is desired, an absorbent material such as polymeric woven and non-woven material or cottons may be most suitable. Preferably, the material used for manufacture of pad cover 11 will be sufficiently inexpensive so that the pad cover can be disposed of as soiled or after a single use, if desired. In an alternate embodiment, however, the pad cover may be made of a material that can be cleaned and reused. Such a material might be a cotton cloth to which a polymeric . . . . - -. - . .
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i material with a tongue or groove is attached around the periphery or at another strategic location.
The novel reversible engagement between pad cover 11 ; 5 and pad 5 provides the advantage of allowing the pad and pad cover to be dispensed and transported as a unit. It also allows the pad cover to be changed or cleaned, when it becomes soiled without requiring disposal or removal ;- of the pad or any portion of the applicator module.
Alternatively, a pad having a covering irreversibly glued, fused, or affixed to its surface (see, e.g., U.S.
Patent # 3,867,939) may be used with the device shown.
Unfortunately, such pads do not afford a number of the advantages of the novel pad and pad cover set described herein and thus are less preferred for use.
Returning now to Fig. 1, it should be noted that the applicator pad 5 is integrally or hermetically connected , to the closed loop conduit 6 in such manner as to allow free flow of fluid from passageways 9 in the pad through the conduit 6 and vice versa. By integrally connecting the pad and the closed loop conduit, one reduces or ` avoids the need for threaded joints or other mechanical connectors typically needed to fill and make up a pad.
` 25 The hermetic nature of the integrated structure greatly reduces the inconvenience of assembly and the potential for leaks and contamination of fluid in the pad.
Consequently, patients are much less likely to develop nosocomial infections when using the pads of the invention.
The conduit 6 may be made of a number of plastic or rubber materials that preferably are resistant to kinking and deformation that causes decreased flow through the conduit. The conduit is preferably flexible and compressible. The conduit may be designed so as to directly interface with the pump and heat exchanger in a .
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manner that allows efficient transfer of heat to or from fluid in the conduit and circulation of such fluid through the conduit and passages of the pad.
In an embodiment that is highly preferred, the applicator module also comprises a cassette 7, which is joined in fluid communicating relation to the conduit.
Thus, in the embodiment shown, the applicator pad 5, conduit 6, and cassette 7 are integrally linked to comprise a closed loop system for fluid circulation, which may be filled with fluid and sterilized as a unit if desired.
In the device shown in Fig. 1, various cassettes 7 are designed to interface the housing, e.g. by insertion into a slot or opening in the body of the housing, in such a manner as to allow operative interface between the cassette heat exchanger and pump mounted in the housing 1. The cassette may have a variety of forms, three of which are described in more detail below.
~igure 3 illustrates a cassette that comprises a flexible region of conduit 14 designed so as to interface with a peristaltic pump 15, which is shown in more detail in Fig. 4. The peristaltic pump comprises a plurality of freely rotatable orbital rollers 16 mounted between end plates 17 driven in rotation by a shaft 18. The flexible section of conduit 14 is arranged in a race through the pump which is spaced from the outer ends of the rollers 16 a distance sufficient to permit collapse of the conduit 14 as the shaft 18 turns. The orbital rollers 16 are moved to first compress the flexible conduit 14, therehy forcing a quantum of fluid trapped in it along the direction of movement of the orbital rollers 16 and causing movement cf fluid through the closed loop system.
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-16- ;, As shown in Figs. 3 and 5, the cassette also includes a heat exchange element 20, which may simply comprise an additional section of a flexible or rigid material such as plastic tubing or maybe made of a variety of different materials specifically designed to enhance heat transfer, such as copper or aluminum, or a polymer with efficient heat transfer characteristics.
The heat exchange element is designed to contact or engage a heat exchanger 21 mounted in the housing in such lo manner as to allow effective transfer of heat or cold from the heat exchanger to the heat exchange element.
Preferably, the heat exchanger 21 is bifunctional and can be used for selective delivery of either heat or cold. However, devices capable of delivering only heat or only cold are also included within the scope of the invention. A number of suitable heat exchangers may be used, including, for example, electric resistor heat ` exchanger, mechanical heat pump, absorption - 20 refrigerator~, or thermoelectric resistor strips.
However, a thermoelectric heat pump or a bank of thermoelectric heat pumps connected in branches or in series capable of selectively delivering heat to or 7 removing heat from the system is preferred. Solid state thermoelectric heat pumps have numerous advantages over separate heating and cooling systems. Generally, thermoelectric heat pumps operate by radiating heat when an electrical potential of one polarity is applied thereto and absorbing heat when an electrical potential of the opposite polarity is applied thereto. A
thermoelectric heat pump may be configured as a flat ~, plate or plates disposed in heat communicating relation to one or both surfaces of the heat exchange interface element 20. Particularly preferred is a heat pump of the type sold by Marlow Industries, Inc. Dallas, Texas.
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In an alternative embodiment, shown in Figs. 6 and 7, the cassette 7 defines a fluid transporting channel or channels 22 interconnected to a bladder or bladders 23 by an inlet valve 24 and an outlet valve 25. The design of S inlet valve 24 allows fluid to flow into the bladder 23 when the fluid pressure inside the bladder is less than the fluid pressure in the channel; similarly, outlet valve 25 allows fluid to flow from the bladder when the -fluid pressure inside the bladder 23 is greater than fluid pressure in the channels 22. Valves of the type commonly known as check valves are preferred, however - other suitable valves would include those known as "one- ~-` way valves" of flutter valves.
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The cassette shown in Fig. 7 comprises a series of - two tandem bladders, each of which has at least one plate e 26 formed of a relatively rigid material such as aluminum or hard plastic. The plate 26 is mounted in such a manner as to allow it to be displaced into the body or cavity of the bladder when force is exerted against it ~i from the exterior of the bladder and, conversely, to -~ allow it to return to its precompression position when l the force is removed. Preferably, the bladder 23 also comprises a resilient member 27 for facilitating or effecting the latter function. In a preferred l embodiment, this resilient member will comprise a sponge `l disposed inside the cavity defined by the bladder;
however, springs or other resilient means could also be used.
The pump functions by intermittently displacing the plate 26, thereby compressing the bladder, and causing fluid flow through the channels defined by the cassette, the conduit and the flow passages of the pad. The pump may, for example, comprise a motor driven cam 28 rotatably mounted on an axis 29 in a manner such that rotation of the cam about its axis alternatively exerts .
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and releases a force against plate 26 so as to cause intermittent compression of the bladder. When the bladder is compressed, the fluid pressure in the bladder is greater than the fluid pressure in the channels so that outlet valve 25 is forced open while inlet valve 24 at the other end is closed and fluid flows from the ` chamber or bladder into the channels located in the cassette. Preferably, when tandem bladders are present, the bladders will be compressed in alternating fashion so as to provide a more even flow of fluid through the closed loop system. Additional bladders may be added if desired.
, In the embodiment shown, the heat exchanger 21 may ; 15 be designed so as to interface with the cassette at one or both sides of bladder 23, but preferably with the side of the bladder opposite the plate 26. In a preferred embodiment, the heat exchanger 21 comprises a flat surface lying adjacent the side of the bladder opposite plate 26. Accordingly, it is preferred that the surface of the bladder adjacent the heat exchanger by made of a material conducive to efficient heat transfer such as copper or aluminum.
In yet a further embodiment, the cassette may be made of a flexible polymeric material and thereby comprise a flexible cassette, having a bladder or a series of bladders in tandem. Like the embodiments shown in Figures 6 and 7, the flexible cassette defines a fluid transporting channel or channels 22 interconnected to a bladder or bladders 23 by an inlet valve 24 and an outlet valve 25, as previously described. With the flexible cassette, valves of the type known as "flutter valves"
are preferred.
The flexible cassette differs from its counterpart shown in Figures 6 and 7 in that it will generally not . - - ... . .
., ~ .. - ,, - . , : ~
-19- ,J, 1,' .., .,. 1 ;..`
include plate 26. Instead, the plate, or another suitable compression element such as a roller bar or cam, is provided in operative relation to the bladder so as to be capable of intermittently compressing the bladder. In a preferred embodiment, the compression element includes a plate mounted on an axis in the housing in such a manner as to allow it to intermittently compress the bladder. In an even more preferred embodiment, a ` thermoelectric heat pump is affixed to the surface of the plate.
An attractive feature of all types of cassettes is the ease and convenience with which they may reversible engage or disengage the housing unit. In the embodiment shown in Figure 1, the engagement mechanism of the housing 1 comprises a slot 30 into which the cassette may be inserted. Of course, the configuration of the slot may be varied in keeping with the size and structure of the cassette. For example, with the cassette shown in ~ 20 Figure 3, one end of the housing is left open and the ;i slot 30 extends a distance into one side of the device.
Alternatively, the slot may be omitted, and the cassette 3 directly abutted to an open end of the housing. If desired, the housing and cassette may be supplemented `~ 25 ~ with additional closure devices, for example a clasp, hatch or catch 31.
As shown in Fig. 1, in addition to the pump and heat exchanger, the housing 1 preferably includes a number of other features designed to facilitate safe, efficient, reliable, and convenient operation and service of the device. Such features may include, for example, a temperature sensing mechanism 32 such as a thermistor or thermostat in temperature sensing relation to a control circuit 36 for controlling the temperature in the system, a plate panel 33, having an on-off switch 34, and a hot-cold switch for controll1ng the heat exchanger and adding .
., . ' ~ ' ' -' ' ' ' ~: : --20- ~ , or removing heat from the system 35. Suitable examples of those features are well known in the art.
Preferably, both the pump and the heat exchanger are electrically powered. Therefore, the housing may also include an electrical connection 37 for imputing power to the system from a battery, electrical outlet or other power source such as an automobile cigarette lighter.
********
. .
The foregoing description of the invention has been directed to particular preferred embodiments in accordance with the requirements of the patent statutes and for purposes of explanation and illustration. It will be apparent, however, to those skilled in the art that many modifications and changes may be made without departing from the scope and the spirit of the invention.
. .
¢ 20 For example, numerous heat exchanger, pumps and ~ housing configurations may be used. In addition, the i form of cassettes utilized may vary from the devices set forth in the drawings. It is apparent that the invention may also be utilized, with other suitable modifications within the state of the art. It is intended in the following claims to cover all such equivalent modifications and variations which fall within the spirit ~nd scope of tho invontlon.
, ., '' ` ,.~ `: -,'~,.~:, . ..... , ':
, ~ -: ' ' . ~ ' ` `
Claims (23)
1. A device for effecting heat transfer to or from selected regions of the body, comprising:
an applicator module including a pad defining a plurality of flow passages therein, and a closed loop conduit integrally joined in fluid communicating relation to the pad so as to enable circulation of a fluid through the flow passages of the pad and the conduit;
a housing having a pump and a heat exchanger operably mounted in the housing; and means for reversibly engaging the conduit with the housing so as to enable the heat exchanger to selectively heat or cool fluid within the conduit and the pump to circulate fluid through the conduit and flow passages of the pad.
an applicator module including a pad defining a plurality of flow passages therein, and a closed loop conduit integrally joined in fluid communicating relation to the pad so as to enable circulation of a fluid through the flow passages of the pad and the conduit;
a housing having a pump and a heat exchanger operably mounted in the housing; and means for reversibly engaging the conduit with the housing so as to enable the heat exchanger to selectively heat or cool fluid within the conduit and the pump to circulate fluid through the conduit and flow passages of the pad.
2. The device of claim 1, wherein the conduit further comprises a cassette integrally joined in fluid communicating relation to the conduit, the cassette having means for interfacing with the heat exchanger in such manner as to enable selective transfer of heat to or from the heat exchanger to a fluid within the cassette, means for operably interfacing with the pump in such manner as to enable the pump to pump fluid through the cassette, and means for reversibly engaging the cassette with the housing.
3. The device of claim 2 wherein the pump comprises a peristaltic pump and the means for interfacing with the pump comprises a flexible tube.
4. The device of claim 1 wherein the heat exchanger comprises a thermoelectric heat pump.
5. The device of claim 1 wherein:
The pump circulates fluid through the conduit by peristaltic action; and the heat exchanger comprises a thermoelectric heat pump for producing heat when an electrical potential of one polarity is applied thereto and for absorbing heat when an electrical potential of the opposite potential is applied thereto;
and wherein the device further comprises, a control circuit, including temperature sensitive means, responsive to the temperature of the fluid for controlling the polarity and duration of application of an electrical potential to the thermoelectric heat pump.
The pump circulates fluid through the conduit by peristaltic action; and the heat exchanger comprises a thermoelectric heat pump for producing heat when an electrical potential of one polarity is applied thereto and for absorbing heat when an electrical potential of the opposite potential is applied thereto;
and wherein the device further comprises, a control circuit, including temperature sensitive means, responsive to the temperature of the fluid for controlling the polarity and duration of application of an electrical potential to the thermoelectric heat pump.
6. The device of claim 2 wherein:
the cassette defines a plurality of fluid transporting channels and includes a bladder disposed in fluid communicating relation to the channels, the bladder having an inlet valve and an outlet valve disposed and formed such that the inlet valve enables fluid to flow into the bladder when fluid pressure inside the bladder is less than the fluid pressure in the channels; and the outlet valve enables fluid to flow from the bladder when fluid pressure inside the bladder is greater than the fluid pressure in the channels;
the pump causes fluid to flow by intermittently increasing fluid pressure in the bladder.
the cassette defines a plurality of fluid transporting channels and includes a bladder disposed in fluid communicating relation to the channels, the bladder having an inlet valve and an outlet valve disposed and formed such that the inlet valve enables fluid to flow into the bladder when fluid pressure inside the bladder is less than the fluid pressure in the channels; and the outlet valve enables fluid to flow from the bladder when fluid pressure inside the bladder is greater than the fluid pressure in the channels;
the pump causes fluid to flow by intermittently increasing fluid pressure in the bladder.
7. The device of claim 6 wherein:
the pump intermittently increases fluid pressure in the bladder by intermittently compressing the bladder; and the bladder comprises resilient means for expanding the bladder after compression by the pump.
the pump intermittently increases fluid pressure in the bladder by intermittently compressing the bladder; and the bladder comprises resilient means for expanding the bladder after compression by the pump.
8. The device of claim 7 wherein the resilient means comprises a sponge.
9. The device of claim 6 wherein:
the cassette further comprises a plate mounted in such manner that the plate compresses the bladder when force is exerted against the plate; and the pump comprises a cam rotatably mounted on an axis in a position such that upon rotation about the axis the cam exerts force against the plate so as to intermittently compress the bladder.
the cassette further comprises a plate mounted in such manner that the plate compresses the bladder when force is exerted against the plate; and the pump comprises a cam rotatably mounted on an axis in a position such that upon rotation about the axis the cam exerts force against the plate so as to intermittently compress the bladder.
10. The device of claim 6 wherein:
the heat exchanger comprises a thermoelectric heat pump for producing heat when an electrical potential of one polarity is applied thereto and for absorbing heat when an electrical potential of the opposite potential is applied thereto;
and wherein the device further comprises, control circuit means, including temperature sensitive means, responsive to the temperature of fluid within the conduit, for controlling the polarity and duration of application of an electrical potential to the thermoelectric heat pump.
the heat exchanger comprises a thermoelectric heat pump for producing heat when an electrical potential of one polarity is applied thereto and for absorbing heat when an electrical potential of the opposite potential is applied thereto;
and wherein the device further comprises, control circuit means, including temperature sensitive means, responsive to the temperature of fluid within the conduit, for controlling the polarity and duration of application of an electrical potential to the thermoelectric heat pump.
11. The device of claim 6 wherein the cassette comprises tandem bladders operatively linked in fluid communicating relation to one another.
12. The device of claim 6 wherein:
the cassette comprises a flexible bladder; and the pump comprises a compression element mounted in the housing in operative relation to the bladder so that the pump is capable of intermittently compressing the bladder.
the cassette comprises a flexible bladder; and the pump comprises a compression element mounted in the housing in operative relation to the bladder so that the pump is capable of intermittently compressing the bladder.
13. The device of claim 1, claim 5, claim 6, or claim 12 wherein the applicator module is disposable.
14. The device of claim 1, claim 5 or claim 6 wherein the applicator module is capable of being sterilized prior to use.
15. An article for use in a localized heat transfer device, comprising:
a pad adapted to be applied to a desired body region, wherein the pad having a plurality of flow passages therein;
a covering for the pad; and means for reversibly affixing the covering to the pad in a manner such that the covering may be removed from the pad.
a pad adapted to be applied to a desired body region, wherein the pad having a plurality of flow passages therein;
a covering for the pad; and means for reversibly affixing the covering to the pad in a manner such that the covering may be removed from the pad.
16. The device of claim 15 wherein the affixation means comprises a tongue in groove mechanism.
17. The device of claim 16 wherein the affixation means comprises a plurality of opposing snaps, wherein each snap mounted on the pad cover is adapted to reversibly engage a corresponding snap mounted on the pad.
18. An apparatus for topically treating an animal or human, which comprises:
a hollow applicator adapted to be placed on an animal or human;
a conduit connected at each end to the applicator to form an integral, hermetic container capable of containing a liquid;
a pump adapted to circulate liquid from the conduit through the applicator; and means functionally associated with the conduit to change the temperature of liquid in the conduit.
a hollow applicator adapted to be placed on an animal or human;
a conduit connected at each end to the applicator to form an integral, hermetic container capable of containing a liquid;
a pump adapted to circulate liquid from the conduit through the applicator; and means functionally associated with the conduit to change the temperature of liquid in the conduit.
19. A thermiatric apparatus for topically treating an animal or human body, which comprises:
an applicator defining an internal flow passage and adapted to be placed on an animal or human body; a cassette defining a compressible, liquid flow channel; and a first tubular member integrally interconnecting one end of the flow channel to a first end of the flow passage, and a second tubular member interconnecting the other end of the flow channel to a second end of the flow passage, to define a closed end, hermetic conduit which includes the passage, the flow channel and both tubular members.
an applicator defining an internal flow passage and adapted to be placed on an animal or human body; a cassette defining a compressible, liquid flow channel; and a first tubular member integrally interconnecting one end of the flow channel to a first end of the flow passage, and a second tubular member interconnecting the other end of the flow channel to a second end of the flow passage, to define a closed end, hermetic conduit which includes the passage, the flow channel and both tubular members.
20. The apparatus of claim 19 which further comprises a housing containing a thermal transfer member capable of transferring heat from a warm member to a cooler member, and a pump, the housing adapted to retractably receive the cassette so as to engage the pump with the flow channel and juxtapose the flow channel and the thermal transfer member.
21. The apparatus of claim 19 wherein the apparatus is portable.
22. A method of topically treating an animal or human body, which comprises:
applying a thermiatric bladder to a part of an animal or human body;
circulating a liquid through a hermetic flow path which includes the bladder; and changing the temperature of the liquid at a point in the flow path removed from the bladder.
applying a thermiatric bladder to a part of an animal or human body;
circulating a liquid through a hermetic flow path which includes the bladder; and changing the temperature of the liquid at a point in the flow path removed from the bladder.
23. A method of topically treating an animal or human body, which comprises:
applying a thermiatric bladder to a part of an animal or human body;
and hermetically circulating a liquid through a flow path which includes the interior of the bladder; and generating a temperature differential in the liquid across the bladder.
applying a thermiatric bladder to a part of an animal or human body;
and hermetically circulating a liquid through a flow path which includes the interior of the bladder; and generating a temperature differential in the liquid across the bladder.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/462,495 US5174285A (en) | 1990-01-08 | 1990-01-08 | Localized heat transfer device |
US462,495 | 1990-01-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2073243A1 true CA2073243A1 (en) | 1991-07-09 |
Family
ID=23836624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002073243A Abandoned CA2073243A1 (en) | 1990-01-08 | 1991-01-08 | Localized heat transfer device |
Country Status (5)
Country | Link |
---|---|
US (2) | US5174285A (en) |
EP (1) | EP0510092A1 (en) |
AU (1) | AU7221891A (en) |
CA (1) | CA2073243A1 (en) |
WO (1) | WO1991010414A2 (en) |
Families Citing this family (199)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6551347B1 (en) * | 1988-09-28 | 2003-04-22 | Life Enhancement Technologies, Inc. | Cooling/heating system |
US5174285A (en) * | 1990-01-08 | 1992-12-29 | Lake Shore Medical Development Partners Ltd. | Localized heat transfer device |
US6620188B1 (en) * | 1998-08-24 | 2003-09-16 | Radiant Medical, Inc. | Methods and apparatus for regional and whole body temperature modification |
US5449379A (en) * | 1993-07-21 | 1995-09-12 | Alternative Compression Technologies, Inc. | Apparatus for applying a desired temperature and pressure to an injured area |
US5411541A (en) * | 1993-08-05 | 1995-05-02 | Oansh Designs Ltd. | Portable fluid therapy device |
US5470353A (en) * | 1993-10-20 | 1995-11-28 | Hollister Incorporated | Post-operative thermal blanket |
US5476489A (en) * | 1994-01-28 | 1995-12-19 | Seabrook Medical Systems, Inc. | Cold therapy system |
US5476492A (en) * | 1994-02-23 | 1995-12-19 | Unrug; Sophia | Body warmer for therapeutic purposes containing whole herb seed |
US5464391A (en) * | 1994-03-03 | 1995-11-07 | Northgate Technologies Inc. | Irrigation system for a surgical site |
DE4412667A1 (en) * | 1994-04-13 | 1995-10-19 | Knoll Ernst Feinmech | Fabric cooling device used in medical procedure |
US6230501B1 (en) | 1994-04-14 | 2001-05-15 | Promxd Technology, Inc. | Ergonomic systems and methods providing intelligent adaptive surfaces and temperature control |
US5895418A (en) * | 1994-09-30 | 1999-04-20 | Saringer Research Inc. | Device for producing cold therapy |
US5628769A (en) * | 1994-09-30 | 1997-05-13 | Saringer Research, Inc. | Method and devices for producing somatosensory stimulation using temperature |
US5647051A (en) * | 1995-02-22 | 1997-07-08 | Seabrook Medical Systems, Inc. | Cold therapy system with intermittent fluid pumping for temperature control |
US5634890A (en) * | 1995-05-09 | 1997-06-03 | Aquasage, Inc. | Water massage therapy device and method for using the same |
US5653741A (en) * | 1995-08-22 | 1997-08-05 | Grant; Edward F. | Heating and cooling pad |
US5800480A (en) | 1996-08-30 | 1998-09-01 | Augustine Medical, Inc. | Support apparatus with a plurality of thermal zones providing localized cooling |
US5837002A (en) * | 1996-08-30 | 1998-11-17 | International Business Machines Corporation | Support apparatus with localized cooling of high-contact-pressure body surface areas |
US6010528A (en) * | 1996-08-30 | 2000-01-04 | Augustine Medical, Inc. | Support apparatus which cradles a body portion for application of localized cooling to high contact-pressure body surface areas |
US6024291A (en) * | 1996-09-25 | 2000-02-15 | Locke; Duncan L. | Auxiliary warming device for vehicles |
US6109338A (en) * | 1997-05-01 | 2000-08-29 | Oceaneering International, Inc. | Article comprising a garment or other textile structure for use in controlling body temperature |
US6117164A (en) | 1997-06-06 | 2000-09-12 | Dj Orthopedics, Llc | Flexible multijoint therapeutic pads |
US6096068A (en) * | 1998-01-23 | 2000-08-01 | Innercool Therapies, Inc. | Selective organ cooling catheter and method of using the same |
US6238428B1 (en) | 1998-01-23 | 2001-05-29 | Innercool Therapies, Inc. | Selective organ cooling apparatus and method employing turbulence-inducing element with curved terminations |
US6719779B2 (en) | 2000-11-07 | 2004-04-13 | Innercool Therapies, Inc. | Circulation set for temperature-controlled catheter and method of using the same |
US6464716B1 (en) | 1998-01-23 | 2002-10-15 | Innercool Therapies, Inc. | Selective organ cooling apparatus and method |
US6325818B1 (en) | 1999-10-07 | 2001-12-04 | Innercool Therapies, Inc. | Inflatable cooling apparatus for selective organ hypothermia |
US6379378B1 (en) | 2000-03-03 | 2002-04-30 | Innercool Therapies, Inc. | Lumen design for catheter |
US6491039B1 (en) | 1998-01-23 | 2002-12-10 | Innercool Therapies, Inc. | Medical procedure |
US6231595B1 (en) | 1998-03-31 | 2001-05-15 | Innercool Therapies, Inc. | Circulating fluid hypothermia method and apparatus |
US6991645B2 (en) | 1998-01-23 | 2006-01-31 | Innercool Therapies, Inc. | Patient temperature regulation method and apparatus |
US6254626B1 (en) | 1998-03-24 | 2001-07-03 | Innercool Therapies, Inc. | Articulation device for selective organ cooling apparatus |
US6051019A (en) | 1998-01-23 | 2000-04-18 | Del Mar Medical Technologies, Inc. | Selective organ hypothermia method and apparatus |
US6491716B2 (en) | 1998-03-24 | 2002-12-10 | Innercool Therapies, Inc. | Method and device for applications of selective organ cooling |
US6251130B1 (en) | 1998-03-24 | 2001-06-26 | Innercool Therapies, Inc. | Device for applications of selective organ cooling |
US6261312B1 (en) | 1998-06-23 | 2001-07-17 | Innercool Therapies, Inc. | Inflatable catheter for selective organ heating and cooling and method of using the same |
US6585752B2 (en) | 1998-06-23 | 2003-07-01 | Innercool Therapies, Inc. | Fever regulation method and apparatus |
US6558412B2 (en) | 1998-01-23 | 2003-05-06 | Innercool Therapies, Inc. | Selective organ hypothermia method and apparatus |
US6251129B1 (en) | 1998-03-24 | 2001-06-26 | Innercool Therapies, Inc. | Method for low temperature thrombolysis and low temperature thrombolytic agent with selective organ temperature control |
US6471717B1 (en) | 1998-03-24 | 2002-10-29 | Innercool Therapies, Inc. | Selective organ cooling apparatus and method |
US6843800B1 (en) | 1998-01-23 | 2005-01-18 | Innercool Therapies, Inc. | Patient temperature regulation method and apparatus |
US6245095B1 (en) | 1998-03-24 | 2001-06-12 | Innercool Therapies, Inc. | Method and apparatus for location and temperature specific drug action such as thrombolysis |
US6383210B1 (en) | 2000-06-02 | 2002-05-07 | Innercool Therapies, Inc. | Method for determining the effective thermal mass of a body or organ using cooling catheter |
US6312452B1 (en) | 1998-01-23 | 2001-11-06 | Innercool Therapies, Inc. | Selective organ cooling catheter with guidewire apparatus and temperature-monitoring device |
US7371254B2 (en) | 1998-01-23 | 2008-05-13 | Innercool Therapies, Inc. | Medical procedure |
US6224624B1 (en) | 1998-03-24 | 2001-05-01 | Innercool Therapies, Inc. | Selective organ cooling apparatus and method |
US6551349B2 (en) | 1998-03-24 | 2003-04-22 | Innercool Therapies, Inc. | Selective organ cooling apparatus |
US6576002B2 (en) | 1998-03-24 | 2003-06-10 | Innercool Therapies, Inc. | Isolated selective organ cooling method and apparatus |
US6599312B2 (en) | 1998-03-24 | 2003-07-29 | Innercool Therapies, Inc. | Isolated selective organ cooling apparatus |
US6685732B2 (en) | 1998-03-31 | 2004-02-03 | Innercool Therapies, Inc. | Method and device for performing cooling- or cryo-therapies for, e.g., angioplasty with reduced restenosis or pulmonary vein cell necrosis to inhibit atrial fibrillation employing microporous balloon |
US6602276B2 (en) | 1998-03-31 | 2003-08-05 | Innercool Therapies, Inc. | Method and device for performing cooling- or cryo-therapies for, e.g., angioplasty with reduced restenosis or pulmonary vein cell necrosis to inhibit atrial fibrillation |
US6905494B2 (en) | 1998-03-31 | 2005-06-14 | Innercool Therapies, Inc. | Method and device for performing cooling- or cryo-therapies for, e.g., angioplasty with reduced restenosis or pulmonary vein cell necrosis to inhibit atrial fibrillation employing tissue protection |
US7291144B2 (en) | 1998-03-31 | 2007-11-06 | Innercool Therapies, Inc. | Method and device for performing cooling- or cryo-therapies for, e.g., angioplasty with reduced restenosis or pulmonary vein cell necrosis to inhibit atrial fibrillation |
US6338727B1 (en) | 1998-08-13 | 2002-01-15 | Alsius Corporation | Indwelling heat exchange catheter and method of using same |
US6419643B1 (en) | 1998-04-21 | 2002-07-16 | Alsius Corporation | Central venous catheter with heat exchange properties |
US6716236B1 (en) | 1998-04-21 | 2004-04-06 | Alsius Corporation | Intravascular catheter with heat exchange element having inner inflation element and methods of use |
US6589271B1 (en) | 1998-04-21 | 2003-07-08 | Alsius Corporations | Indwelling heat exchange catheter |
US8128595B2 (en) | 1998-04-21 | 2012-03-06 | Zoll Circulation, Inc. | Method for a central venous line catheter having a temperature control system |
US6458150B1 (en) | 1999-02-19 | 2002-10-01 | Alsius Corporation | Method and apparatus for patient temperature control |
US6368304B1 (en) | 1999-02-19 | 2002-04-09 | Alsius Corporation | Central venous catheter with heat exchange membrane |
US6312453B1 (en) | 1998-07-16 | 2001-11-06 | Olympic Medical Corp. | Device for cooling infant's brain |
US6450990B1 (en) | 1998-08-13 | 2002-09-17 | Alsius Corporation | Catheter with multiple heating/cooling fibers employing fiber spreading features |
US6673098B1 (en) * | 1998-08-24 | 2004-01-06 | Radiant Medical, Inc. | Disposable cassette for intravascular heat exchange catheter |
US6620189B1 (en) * | 2000-02-28 | 2003-09-16 | Radiant Medical, Inc. | Method and system for control of a patient's body temperature by way of a transluminally insertable heat exchange catheter |
US6197045B1 (en) * | 1999-01-04 | 2001-03-06 | Medivance Incorporated | Cooling/heating pad and system |
EP1616543B1 (en) | 1999-01-04 | 2008-09-03 | Medivance Incorporated | Improved cooling/heating pad and system |
US6830581B2 (en) | 1999-02-09 | 2004-12-14 | Innercool Therspies, Inc. | Method and device for patient temperature control employing optimized rewarming |
US6869440B2 (en) | 1999-02-09 | 2005-03-22 | Innercool Therapies, Inc. | Method and apparatus for patient temperature control employing administration of anti-shivering agents |
US6405080B1 (en) | 1999-03-11 | 2002-06-11 | Alsius Corporation | Method and system for treating cardiac arrest |
US6582398B1 (en) | 1999-02-19 | 2003-06-24 | Alsius Corporation | Method of managing patient temperature with a heat exchange catheter |
US6299599B1 (en) | 1999-02-19 | 2001-10-09 | Alsius Corporation | Dual balloon central venous line catheter temperature control system |
US6019783A (en) * | 1999-03-02 | 2000-02-01 | Alsius Corporation | Cooling system for therapeutic catheter |
US6238427B1 (en) | 1999-03-30 | 2001-05-29 | John G. Matta | Therapeutic heat transfer pads |
US6405491B1 (en) | 1999-04-22 | 2002-06-18 | Hill-Rom Services, Inc. | Modular patient room |
US7174678B2 (en) | 1999-04-22 | 2007-02-13 | Hill-Rom Services, Inc. | Modular patient room |
US6165207A (en) * | 1999-05-27 | 2000-12-26 | Alsius Corporation | Method of selectively shaping hollow fibers of heat exchange catheter |
GB2350566A (en) * | 1999-06-04 | 2000-12-06 | Mark Rawlinson Bailey | Liquid cooler and heater |
US6287326B1 (en) | 1999-08-02 | 2001-09-11 | Alsius Corporation | Catheter with coiled multi-lumen heat transfer extension |
US6447474B1 (en) * | 1999-09-15 | 2002-09-10 | Alsius Corporation | Automatic fever abatement system |
US6279338B1 (en) * | 2000-02-19 | 2001-08-28 | Samir Badry Mohamed | Cold compresses apparatus |
EP1800634A3 (en) * | 2000-02-28 | 2010-12-08 | Radiant Medical, Inc. | Disposable casette for intravascular heat exchange catheter |
ATE359748T1 (en) * | 2000-02-28 | 2007-05-15 | Radiant Medical Inc | DISPOSABLE CASSETTE FOR INTRAVASCULAR HEAT EXCHANGE CATHETER |
AU2006201614B2 (en) * | 2000-02-28 | 2008-07-24 | Radiant Medical, Inc. | Disposable cassette for intravascular heat exchange catheter |
US6726708B2 (en) | 2000-06-14 | 2004-04-27 | Innercool Therapies, Inc. | Therapeutic heating and cooling via temperature management of a colon-inserted balloon |
AU2007201161B2 (en) * | 2000-07-21 | 2010-12-16 | Zoll Circulation, Inc. | Heat exchanger catheter for controlling body temperature |
US6942015B1 (en) * | 2000-10-05 | 2005-09-13 | Jenkins Comfort Systems, Llc | Body heating/cooling apparatus |
US6474093B1 (en) | 2000-10-23 | 2002-11-05 | Cosmo Tech Development, Inc. | Expanding barrel system for cooling beverages |
US6551348B1 (en) | 2001-01-26 | 2003-04-22 | Deroyal Industries, Inc. | Temperature controlled fluid therapy system |
US6544282B1 (en) | 2001-02-21 | 2003-04-08 | Radiant Medical, Inc. | Inhibition of platelet activation, aggregation and/or adhesion by hypothermia |
AU2002309987A1 (en) * | 2001-05-25 | 2002-12-09 | Hill-Rom Services, Inc. | Modular patient room |
US6978499B2 (en) * | 2001-05-25 | 2005-12-27 | Hill-Rom Services, Inc. | Architectural bed docking apparatus |
US6637049B2 (en) | 2001-05-25 | 2003-10-28 | Hill-Rom Services, Inc. | Personal care module |
US6598251B2 (en) | 2001-06-15 | 2003-07-29 | Hon Technology Inc. | Body support system |
WO2003015672A1 (en) | 2001-08-15 | 2003-02-27 | Innercool Therapies, Inc. | Method and apparatus for patient temperature control employing administration of anti-shivering |
US20030125649A1 (en) * | 2001-10-31 | 2003-07-03 | Mcintosh Laura Janet | Method and system apparatus using temperature and pressure for treating medical disorders |
US6572640B1 (en) | 2001-11-21 | 2003-06-03 | Alsius Corporation | Method and apparatus for cardiopulmonary bypass patient temperature control |
DE10297559T5 (en) * | 2001-12-20 | 2005-06-02 | Wit Ip Corporation(N.D.Ges.D.Staates Delaware), Southborough | Modular thermal treatment systems with disposable disposable catheter assemblies and associated methods |
US6523354B1 (en) * | 2002-03-08 | 2003-02-25 | Deborah Ann Tolbert | Cooling blanket |
US7008445B2 (en) | 2002-04-29 | 2006-03-07 | Medcool, Inc. | Method and device for rapidly inducing hypothermia |
US7052509B2 (en) | 2002-04-29 | 2006-05-30 | Medcool, Inc. | Method and device for rapidly inducing and then maintaining hypothermia |
US6714821B1 (en) | 2002-05-31 | 2004-03-30 | Karl A. Duda | Heating pad assembly |
AU2002950146A0 (en) * | 2002-07-10 | 2002-09-12 | Ronald Kenneth Cardow | Thermo hydra - pressure unit circulator |
US6827728B2 (en) | 2002-08-08 | 2004-12-07 | Medivance Incorporated | Patient temperature control system |
US6802855B2 (en) | 2002-08-08 | 2004-10-12 | Medivance Incorporated | Patient temperature control system connector apparatus |
US7186222B1 (en) * | 2002-09-10 | 2007-03-06 | Radiant Medical, Inc. | Vascular introducer with temperature monitoring probe and systems for endovascular temperature control |
WO2004023982A2 (en) * | 2002-09-12 | 2004-03-25 | Radiant Medical, Inc. | System and method for determining and controlling core body temperature |
US7211104B2 (en) | 2002-10-08 | 2007-05-01 | Vital Wear, Inc. | Contrast therapy system and method |
US8425579B1 (en) | 2002-10-08 | 2013-04-23 | Vitalwear, Inc. | Therapeutic knee brace for a contrast therapy system |
US8226698B2 (en) * | 2002-10-08 | 2012-07-24 | Vitalwear, Inc. | Therapeutic cranial wrap for a contrast therapy system |
US7694693B1 (en) | 2002-10-08 | 2010-04-13 | Vitalwear, Inc. | Mixing valve for a contrast therapy system |
US8216290B2 (en) | 2002-10-08 | 2012-07-10 | Vitalwear, Inc. | Automated temperature contrast and dynamic pressure modules for a hot or cold wrap therapy system |
US8052628B1 (en) | 2002-10-08 | 2011-11-08 | Vitalwear, Inc. | Spinal column brace for a contrast therapy system |
US20040267340A1 (en) * | 2002-12-12 | 2004-12-30 | Wit Ip Corporation | Modular thermal treatment systems with single-use disposable catheter assemblies and related methods |
JP4658612B2 (en) | 2002-12-12 | 2011-03-23 | メドクール・インコーポレイテッド | Method and apparatus for rapidly inducing and maintaining hypothermia |
US7658205B1 (en) | 2002-12-19 | 2010-02-09 | Vitalwear, Inc. | Systems for a fluid circuit coupler |
US7278984B2 (en) | 2002-12-31 | 2007-10-09 | Alsius Corporation | System and method for controlling rate of heat exchange with patient |
US20040167466A1 (en) * | 2003-02-21 | 2004-08-26 | Drasler William J. | Delivering cooled fluid to sites inside the body |
US7300453B2 (en) | 2003-02-24 | 2007-11-27 | Innercool Therapies, Inc. | System and method for inducing hypothermia with control and determination of catheter pressure |
US6770085B1 (en) * | 2003-04-11 | 2004-08-03 | Ryan R Munson | Heat absorbing pad |
WO2004105587A2 (en) * | 2003-05-28 | 2004-12-09 | Medcool, Inc. | Methods and apparatus for thermally activating a console of a thermal delivery system |
US20060287697A1 (en) * | 2003-05-28 | 2006-12-21 | Medcool, Inc. | Methods and apparatus for thermally activating a console of a thermal delivery system |
US20040249427A1 (en) * | 2003-06-06 | 2004-12-09 | Yunes Nabilsi | Medical cooler device |
US7160316B2 (en) | 2003-09-24 | 2007-01-09 | Dynatherm Medical, Inc. | Methods and apparatus for adjusting body core temperature |
US8182521B2 (en) | 2003-09-24 | 2012-05-22 | Dynatherm Medical Inc. | Methods and apparatus for increasing blood circulation |
US7326195B2 (en) * | 2003-11-18 | 2008-02-05 | Boston Scientific Scimed, Inc. | Targeted cooling of tissue within a body |
EP1727503A1 (en) | 2004-02-23 | 2006-12-06 | Aqueduct Medical, Inc. | Temperature-controllable device |
WO2005089297A2 (en) * | 2004-03-16 | 2005-09-29 | Mario Michel Rathle | Self-ventilating and self-cooling variable geometry pillow |
US20050284417A1 (en) * | 2004-06-25 | 2005-12-29 | Animal Capture Equipment, Inc. | Device for cooling and moistening sea mammal |
US7959657B1 (en) | 2004-07-07 | 2011-06-14 | Harsy Douglas R | Portable thermal therapeutic apparatus and method |
US20060025840A1 (en) * | 2004-08-02 | 2006-02-02 | Martin Willard | Cooling tissue inside the body |
US7828831B1 (en) | 2004-12-06 | 2010-11-09 | Deroyal Industries, Inc. | Hot and cold fluid therapy system |
JP2006226569A (en) * | 2005-02-16 | 2006-08-31 | Hokkaido Univ | Compact cooling and heating device and cooling and heating method |
US8491644B1 (en) * | 2005-02-22 | 2013-07-23 | Medivance Incorporated | Portable, refrigerant-based apparatus and method for rapid systemic patient cooling |
AU2006239290B2 (en) | 2005-04-27 | 2012-05-10 | Zoll Circulation, Inc. | System for adjusting the temperature of a patient |
US7951182B2 (en) * | 2005-07-14 | 2011-05-31 | Zoll Circulation, Inc. | System and method for leak detection in external cooling pad |
DE102005038766A1 (en) * | 2005-08-17 | 2007-03-01 | Erhard Keller | Body parts e.g. skin, cooling device for e.g. humans, has cooling pad that is provided for attaching at body part, where cooling pad connected to cooling device comprises cold pack with connecting pipes |
US20070113564A1 (en) * | 2005-11-23 | 2007-05-24 | Whitney David L | Mechanically heated and cooled shoes with easy-to-use controls |
US7666214B2 (en) * | 2006-04-12 | 2010-02-23 | Smiths Medical Asd, Inc. | Underbody thermal blanket |
US8529613B2 (en) | 2006-10-18 | 2013-09-10 | Medcool, Inc. | Adjustable thermal cap |
US9308148B2 (en) | 2006-12-04 | 2016-04-12 | Thermatx, Inc. | Methods and apparatus for adjusting blood circulation |
US8603150B2 (en) | 2006-12-04 | 2013-12-10 | Carefusion 2200, Inc. | Methods and apparatus for adjusting blood circulation |
KR101547610B1 (en) * | 2006-12-21 | 2015-08-26 | 비티지 인터내셔널 리미티드 | Device and method for producing therapeutic foam |
US9044371B2 (en) * | 2007-06-13 | 2015-06-02 | Trailerlogic, Llc | Scalable and portable human remains cold storage system |
US8475509B2 (en) * | 2007-08-09 | 2013-07-02 | Zoll Circulation, Inc. | Devices and methods for using endovascular cooling to treat septic shock and other disorders |
US20090143844A1 (en) * | 2007-11-29 | 2009-06-04 | Gaymar Industries, Inc. | Hose management for convective devices |
BE1017916A3 (en) * | 2007-12-31 | 2009-11-03 | Gebotech Bv | HEAT EXCHANGER. |
JP2009254795A (en) * | 2008-03-18 | 2009-11-05 | Nippon Koden Corp | Liquid temperature regulator |
US8475508B2 (en) * | 2008-05-15 | 2013-07-02 | Ryan R Munson | Therapeutic cooling system |
US20100004595A1 (en) * | 2008-07-01 | 2010-01-07 | Ethicon, Inc. | Balloon catheter systems for treating uterine disorders having fluid line de-gassing assemblies and methods therefor |
GB2461905A (en) * | 2008-07-17 | 2010-01-20 | John Christopher Magrath | Heating and cooling blanket |
US20100319381A1 (en) * | 2009-06-17 | 2010-12-23 | The Government Of The Us, As Represented By The Secretary Of The Navy | Body Armor Suite Cooling System |
GB2474233A (en) * | 2009-10-06 | 2011-04-13 | Uk Investments Associates Llc | Cooling pump comprising a detachable head portion |
NO20093496A1 (en) * | 2009-12-09 | 2011-06-06 | E Innovation As | Device for breathing air unit |
CN102917674A (en) | 2010-01-08 | 2013-02-06 | 康尔福盛2200公司 | Methods and apparatus for enhancing vascular access in an appendage to enhance therapeutic and interventional procedures |
US20140234793A1 (en) * | 2010-06-04 | 2014-08-21 | Alvin Stewart Ostrow | Moist heat drug delivery apparatus and method |
TW201225944A (en) * | 2010-12-28 | 2012-07-01 | Univ Tatung | Cold/hot therapy device with temperature control |
US9283110B2 (en) | 2011-09-20 | 2016-03-15 | Zoll Circulation, Inc. | Patient temperature control catheter with outer sleeve cooled by inner sleeve |
US9259348B2 (en) | 2011-09-28 | 2016-02-16 | Zoll Circulation, Inc. | Transatrial patient temperature control catheter |
US10045881B2 (en) | 2011-09-28 | 2018-08-14 | Zoll Circulation, Inc. | Patient temperature control catheter with helical heat exchange paths |
US8888832B2 (en) | 2011-09-28 | 2014-11-18 | Zoll Circulation, Inc. | System and method for doubled use of patient temperature control catheter |
US9314370B2 (en) | 2011-09-28 | 2016-04-19 | Zoll Circulation, Inc. | Self-centering patient temperature control catheter |
US9566187B2 (en) * | 2012-03-13 | 2017-02-14 | Breg, Inc. | Cold therapy systems and methods |
US9717625B2 (en) | 2012-09-28 | 2017-08-01 | Zoll Circulation, Inc. | Intravascular heat exchange catheter with non-round coiled coolant path |
US9433528B2 (en) | 2012-09-28 | 2016-09-06 | Zoll Circulation, Inc. | Intravascular heat exchange catheter with rib cage-like coolant path |
US9241827B2 (en) | 2012-09-28 | 2016-01-26 | Zoll Circulation, Inc. | Intravascular heat exchange catheter with multiple spaced apart discrete coolant loops |
US9801756B2 (en) | 2012-09-28 | 2017-10-31 | Zoll Circulation, Inc. | Intravascular heat exchange catheter and system with RFID coupling |
CN104869869B (en) | 2012-10-18 | 2017-06-09 | 泰普尔-派迪克管理有限责任公司 | Supporting pad and the method for controlling the surface temperature of the supporting pad |
US9278023B2 (en) | 2012-12-14 | 2016-03-08 | Zoll Circulation, Inc. | System and method for management of body temperature |
US20150025606A1 (en) * | 2013-07-19 | 2015-01-22 | James Elliott Davis | Pillow with integrated cooling system |
US9474644B2 (en) | 2014-02-07 | 2016-10-25 | Zoll Circulation, Inc. | Heat exchange system for patient temperature control with multiple coolant chambers for multiple heat exchange modalities |
US20150223974A1 (en) * | 2014-02-07 | 2015-08-13 | Zoll Circulation, Inc. | Patient heat exchange system with transparent wall for viewing circulating refrigerant |
US11033424B2 (en) * | 2014-02-14 | 2021-06-15 | Zoll Circulation, Inc. | Fluid cassette with tensioned polymeric membranes for patient heat exchange system |
US10792185B2 (en) * | 2014-02-14 | 2020-10-06 | Zoll Circulation, Inc. | Fluid cassette with polymeric membranes and integral inlet and outlet tubes for patient heat exchange system |
US10500088B2 (en) * | 2014-02-14 | 2019-12-10 | Zoll Circulation, Inc. | Patient heat exchange system with two and only two fluid loops |
US10179064B2 (en) | 2014-05-09 | 2019-01-15 | Sleepnea Llc | WhipFlash [TM]: wearable environmental control system for predicting and cooling hot flashes |
US9709609B2 (en) | 2014-07-14 | 2017-07-18 | Covidien Lp | Systems and methods for improving the range of sensor systems |
WO2016029109A2 (en) * | 2014-08-22 | 2016-02-25 | Calderon Henry | System for local thermal treatment |
US9784263B2 (en) | 2014-11-06 | 2017-10-10 | Zoll Circulation, Inc. | Heat exchange system for patient temperature control with easy loading high performance peristaltic pump |
US11359620B2 (en) | 2015-04-01 | 2022-06-14 | Zoll Circulation, Inc. | Heat exchange system for patient temperature control with easy loading high performance peristaltic pump |
US9713566B2 (en) * | 2014-12-04 | 2017-07-25 | Corey Lavigne | Heating and cooling mat assembly |
AU2016243565A1 (en) | 2015-03-28 | 2017-10-19 | The Regents Of The University Of California | Thermoelectric temperature controlled cooler for biomedical applications |
US11213423B2 (en) | 2015-03-31 | 2022-01-04 | Zoll Circulation, Inc. | Proximal mounting of temperature sensor in intravascular temperature management catheter |
US20160287432A1 (en) * | 2015-03-31 | 2016-10-06 | Zoll Circulation, Inc. | Serpentine heat exchange assembly for removable engagement with patient heat exchange system |
US10537465B2 (en) * | 2015-03-31 | 2020-01-21 | Zoll Circulation, Inc. | Cold plate design in heat exchanger for intravascular temperature management catheter and/or heat exchange pad |
US10022265B2 (en) | 2015-04-01 | 2018-07-17 | Zoll Circulation, Inc. | Working fluid cassette with hinged plenum or enclosure for interfacing heat exchanger with intravascular temperature management catheter |
CN109475747A (en) | 2016-03-28 | 2019-03-15 | 加利福尼亚大学董事会 | Heat exchange module and system for medical applications |
WO2017172836A1 (en) | 2016-03-28 | 2017-10-05 | Hypothermia Devices, Inc. | Heat exchange module, system and method |
KR101864011B1 (en) * | 2016-05-30 | 2018-06-01 | 최령일 | Medical device for controlling body temperature using thermoelectric element |
JP7166249B2 (en) | 2016-09-28 | 2022-11-07 | ハイポサーミア デバイシズ,インコーポレイテッド | Heat exchange module, system and method |
CN106510933A (en) * | 2016-12-13 | 2017-03-22 | 杭州才风科技有限公司 | Dressing system and dressing apparatus |
US11116657B2 (en) | 2017-02-02 | 2021-09-14 | Zoll Circulation, Inc. | Devices, systems and methods for endovascular temperature control |
US11185440B2 (en) | 2017-02-02 | 2021-11-30 | Zoll Circulation, Inc. | Devices, systems and methods for endovascular temperature control |
US11337851B2 (en) | 2017-02-02 | 2022-05-24 | Zoll Circulation, Inc. | Devices, systems and methods for endovascular temperature control |
DE102018105674B3 (en) * | 2018-03-12 | 2019-08-01 | NMI Naturwissenschaftliches und Medizinisches Institut an der Universität Tübingen | cooling pad; Cooler; Cooling system and method for operating a cooling pad and a cooling device |
US20200352345A1 (en) * | 2019-05-07 | 2020-11-12 | Sinomax USA Inc. | Mattress comprising one or more cooling devices |
EP4252723A1 (en) * | 2020-03-27 | 2023-10-04 | Quickcool AB | Removable liquid heat exchanging element for use in a device for temperature control treatment |
US11793670B2 (en) | 2020-06-11 | 2023-10-24 | Douglas R. Harsy | Cold therapy device and method |
TWI795190B (en) * | 2022-01-24 | 2023-03-01 | 黃進華 | Cold and hot compress device with high-efficiency hot and cold conversion and quick replacement of compress tape |
TWI769968B (en) * | 2022-01-24 | 2022-07-01 | 黃進華 | A hot and cold compress device that can quickly replace the tape and has high-efficiency cold and heat conversion |
Family Cites Families (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1025012A (en) * | 1909-06-22 | 1912-04-30 | Elise R Norwood | Water-bag retainer. |
DE746650C (en) * | 1941-08-12 | 1944-08-16 | Max Engel | Heating device |
US2566865A (en) * | 1946-12-26 | 1951-09-04 | Wingerter Ralph | Portable refrigerator |
DE1053537B (en) * | 1958-02-28 | 1959-03-26 | Siemens Reiniger Werke Ag | Cooling pillow |
US3046903A (en) * | 1960-03-18 | 1962-07-31 | George W Jones | Artificial blood circulation apparatus |
US3088288A (en) * | 1960-12-21 | 1963-05-07 | Thore M Elfving | Thermoelectric refrigeration system |
US3074410A (en) * | 1961-01-23 | 1963-01-22 | Gorman Rupp Ind Inc | Temperature control for therapeutic apparatus |
US3154926A (en) * | 1962-09-25 | 1964-11-03 | Max L Hirschhorn | Cooling blanket |
US3480015A (en) * | 1967-05-12 | 1969-11-25 | Medical Electroscience Inc | Apparatus for collecting and cooling blood |
US3738372A (en) * | 1972-01-13 | 1973-06-12 | T Shioshvili | Apparatus for application of local hypothermy to the kidney |
US3867939A (en) * | 1972-05-18 | 1975-02-25 | Moore Perk Corp | Disposable, sterile temperature control applicator pad for medical application |
US3967627A (en) * | 1974-11-18 | 1976-07-06 | Moore-Perk Corporation | Hot/cold applicator system |
US4114620A (en) * | 1977-03-02 | 1978-09-19 | Moore-Perk Corporation | Patient treatment pad for hot or cold use |
US4199307A (en) * | 1977-07-05 | 1980-04-22 | Andros Incorporated | Medical infusion system |
US4256437A (en) * | 1978-02-01 | 1981-03-17 | Stewart Naumann Laboratories, Inc. | Peristaltic infusion pump and method |
FR2417974A1 (en) * | 1978-02-23 | 1979-09-21 | Electro Vente | Peltier effect unit for skin treatment - has fan on one side and coil on other side to balance unequal temperature effects |
FR2435678A1 (en) * | 1978-09-06 | 1980-04-04 | Grandi Rene | Portable multi-use refrigerating equipment - utilises pumped fluid to conduct thermoelectric element energy to point of use |
US4259961A (en) * | 1979-01-24 | 1981-04-07 | Hood Iii Andrew G | Cooling pad |
US4335726A (en) * | 1980-07-11 | 1982-06-22 | The Kendall Company | Therapeutic device with temperature and pressure control |
US4476685A (en) * | 1981-05-11 | 1984-10-16 | Extracorporeal Medical Specialties, Inc. | Apparatus for heating or cooling fluids |
US4523594A (en) * | 1982-02-12 | 1985-06-18 | Lawrence Kuznetz | Stretchable textile heat-exchange jacket |
US4459468A (en) * | 1982-04-14 | 1984-07-10 | Bailey David F | Temperature control fluid circulating system |
US4691762A (en) * | 1983-04-01 | 1987-09-08 | Life Support Systems, Inc. | Personal temperature control system |
GB2173890B (en) * | 1985-04-20 | 1988-11-09 | Aisin Seiki | Heat exchangers |
US4713051A (en) * | 1985-05-21 | 1987-12-15 | Coopervision, Inc. | Cassette for surgical irrigation and aspiration and sterile package therefor |
US4844072A (en) * | 1985-12-27 | 1989-07-04 | Seabrook Medical Systems, Inc. | Liquid-circulating thermal therapy system |
US4962761A (en) * | 1987-02-24 | 1990-10-16 | Golden Theodore A | Thermal bandage |
US4930317A (en) * | 1988-05-20 | 1990-06-05 | Temperature Research Corporation | Apparatus for localized heat and cold therapy |
US5002201A (en) * | 1988-09-14 | 1991-03-26 | Aquatec Inc. | Bottled water cooler apparatus and method |
US4894072A (en) * | 1989-03-27 | 1990-01-16 | General Motors Corporation | High efficiency vapor storage canister |
US5174285A (en) * | 1990-01-08 | 1992-12-29 | Lake Shore Medical Development Partners Ltd. | Localized heat transfer device |
-
1990
- 1990-01-08 US US07/462,495 patent/US5174285A/en not_active Expired - Fee Related
-
1991
- 1991-01-08 WO PCT/US1991/000144 patent/WO1991010414A2/en not_active Application Discontinuation
- 1991-01-08 EP EP91903454A patent/EP0510092A1/en not_active Withdrawn
- 1991-01-08 AU AU72218/91A patent/AU7221891A/en not_active Abandoned
- 1991-01-08 CA CA002073243A patent/CA2073243A1/en not_active Abandoned
-
1992
- 1992-03-16 US US07/852,431 patent/US5344436A/en not_active Expired - Fee Related
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EP0510092A1 (en) | 1992-10-28 |
US5174285A (en) | 1992-12-29 |
US5344436A (en) | 1994-09-06 |
WO1991010414A2 (en) | 1991-07-25 |
WO1991010414A3 (en) | 1991-10-31 |
AU7221891A (en) | 1991-08-05 |
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Legal Events
Date | Code | Title | Description |
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FZDE | Discontinued |