WO1996010379A2 - Method and devices for producing somatosensory stimulation using temperature - Google Patents
Method and devices for producing somatosensory stimulation using temperature Download PDFInfo
- Publication number
- WO1996010379A2 WO1996010379A2 PCT/CA1995/000551 CA9500551W WO9610379A2 WO 1996010379 A2 WO1996010379 A2 WO 1996010379A2 CA 9500551 W CA9500551 W CA 9500551W WO 9610379 A2 WO9610379 A2 WO 9610379A2
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- WIPO (PCT)
- Prior art keywords
- fluid
- pain
- housing
- impeller
- adjacent
- Prior art date
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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
- A61F7/007—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating
-
- 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
- A61F7/007—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating
- A61F2007/0075—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating using a Peltier element, e.g. near the spot to be heated or cooled
-
- 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
- A61F7/007—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating
- A61F2007/0075—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating using a Peltier element, e.g. near the spot to be heated or cooled
- A61F2007/0076—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating using a Peltier element, e.g. near the spot to be heated or cooled remote from the spot to be heated or cooled
-
- 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
- A61F2007/0295—Compresses or poultices for effecting heating or cooling for heating or cooling or use at more than one temperature
- A61F2007/0298—Compresses or poultices for effecting heating or cooling for heating or cooling or use at more than one temperature with a section for heating and a section for cooling
Definitions
- the present invention relates to a method and devices for producing somatosensory stimulation for alleviating pain. More particularly the invention relates to a method of alleviating pain by simultaneously heating and cooling adjacent skin areas in the vicinity of pain and to devices for implementing the method.
- Pain abatement research is a major area of study which goes hand-in-hand with pain research itself.
- pain is a symptom of an underlying malady so the presence and nature of the pain in these cases is sometimes essential in aiding awareness and the diagnosis of the underlying illness.
- the abatement of pain has traditionally been effected using various external and internal treatments.
- external treatment include acupuncture, electro-shock treatment using transcutaneous electrical nerve stimulation (TENS), use of temperature such as application of hot or cold packs or topical application of cooling or heating formulations.
- Examples of internal, invasive treatments include drug treatments by oral administration or injection or injection of freezing agents. Where feasible, the external physical methods of alleviating pain are preferable over the invasive, internal techniques for obvious reasons.
- Hot or cold to localized pain such as muscle or tendon pain to reduce swelling has a long history.
- Another type of device is the heating blanket that uses electrical resistive heaters for heating.
- United States Patent No. 4,094,357 discloses a heat transfer blanket which uses heat pipes coupled to heating/cooling systems.
- United States Patent No. 5,269,369 teaches a body suit which utilizes a system of heat pipes to redistribute body heat for heating or cooling the person wearing the suit.
- United States Patent Nos. 4,459,468 and 4,962,761 disclose fluid circulation systems for use with thermal bandages, pads or blankets. A drawback to these circulations systems is that they are quite bulky and awkward since they use large fluid pumps between the heat exchanger and the blanket or pad being heated or cooled. Other systems employ condensers, refrigerants and evaporator coils which are also bulky, awkward and of limited mobility. The use of heating or cooling to alleviate certain types of pain by stimulating or constricting blood flow is well known.
- United States Patent No. 5,314,456 issued to Cohen discloses a heating pad for relief of headache- related back, neck and head pain designed to induce venous constriction and enlargement to alter blood flow in the head to relieve headaches.
- Temporal temperature modulation techniques have been developed wherein the applied temperature is switched between hot and cold.
- United States Patent No. 4,585,002 discloses a method and apparatus for alleviating pain through somatosensory stimulation achieved by frequent alternating temperature stimulation of the skin adjacent to the area of pain. This patent teaches that the habituation to heat and cold can be overcome by cycling one after the other to cause a dynamic temperature sensation more intense than achievable with either hot or cold individually. The frequency of the temperature change from hot to cold or vice versa is several times per minute which is observed to induce the maximal dynamic phase of the thermoreceptors in tissue.
- An improvement over Patent No. 4,585,002 is disclosed in United States Patent No.
- thermoelectric unit 4,860,748 which uses a thermal pattern generator to produce a variety of thermal wave patterns of hot and cold but with temperature switching frequencies of the order of a minute, greater than the switching times disclosed in '002.
- These devices use Peltier thermoelectric units so that the temperature depends on the polarity of the current through the thermoelectric unit.
- Heat and cold are among the most intense stimuli that can be safely applied to the human body within an appropriate temperature range without causing permanent injury or damage. Skin can withstand temperatures in the range from about 0°C to 45-50°C for extended periods of time without causing permanent damage or injury. While many prior art methods of alleviating pain teach application of heat or cold, these methods involve applying one or the other alone or alternating heat and cold temporally on the effected area. Application of heat or cold alone is accompanied by adaption which decreases the efficacy of the technique. In other words the maximum benefit occurs during the initial period of heating or cooling and drops off once the body adapts to the heat or cold.
- a drawback to temporal temperature modulation techniques is that a significant fraction of the duty cycle is required for the skin temperature to reach the temperature of the device so the maximum sensory stimulus is not achieved. Further, among devices that employ heat and/or cold for somatosensory stimulation to block pain, adaptation or habituation to the sensation limits the effectiveness of the treatments. In all these cases the treatments are similar to naturally occurring phenomena and hence the body has built in methods of adaptation.
- the present invention provides enhanced somatosensory stimulation by concurrently heating and cooling adjacent skin areas in the vicinity of pain to a large but safe temperature differential.
- Large spatially modulated temperature differences within confined areas on the skin surface are totally artificial and accordingly the brain has no mechanism to habituate or adapt other than through total suppression of all signals from stimuli, including pain, from the affected area.
- the limitations inherent in sequential heat or cold treatments as a result of habituation and adaptation responses of the brain are reduced.
- the resulting somatosensory stimulation is superior to that produced by temporal thermal modulation since the same neural pathways are simultaneously flooded with hot and cold stimulation so the resulting brain response to habituate to the heat causes enhancement of the sensation of cold and conversely habituation to cold serves to increase the sensation of heat, hence any brain response to adapt to one sensation is self-defeating since it causes increased sensitivity to the other.
- the method of alleviating pain using temperature comprises producing somatosensory stimulation in patients having a pain locus on their body which is sensed in their brain by way of signals transmitted along neural pathways from the pain locus using temperature for pain abatement.
- the method comprises the steps of simultaneously heating a first area and cooling a second area of the patient's skin adjacent to the neural pathways to stimulate additional signals of sensed heating and cooling along the neural pathways extending from the pain locus to the patient's brain.
- a method of producing somatosensory stimulation in a patient having a pain locus and neural pathways transmitting pain signals to the patient's brain using temperature for pain abatement comprises simultaneously heating and cooling adjacent skin areas in the vicinity of the pain so that signals of heat and cold are transmitted along said neural pathways to the patient's brain.
- the temperature of the heated skin area no higher than about 45°C and the temperature of the cooled skin area is no less than about 0°C.
- a device for simultaneously heating and cooling adjacent skin areas comprises a member adapted to be applied to the skin which includes at least a first section which can be heated and at least a second section which can be cooled with the first and second sections being adjacent to each other for heating and cooling adjacent skin areas.
- the device includes means for simultaneously heating the first section to at most 45°C and cooling the second section to 0°C or higher.
- the present invention also provides a fluid pump comprising a housing having an open end portion and one of either a heat source and heat sink attached to said housing at the open end portion.
- the fluid pump includes a motor with an impeller operably coupled thereto for rotation with the motor and impeller located in the housing with the impeller adjacent to said one of either a heat source and heat sink.
- the housing provided with a fluid inlet for admitting heat transfer fluid into the housing.
- the housing includes at least one fluid recirculation outlet and at least one fluid recirculation inlet, whereby rotation of the impeller forces the heat transfer fluid over said one of either a heat source and heat sink through the fluid outlet.
- Figure 1 is a perspective view of a somatosensory stimulation device for applying temperature differential to adjacent skin areas constructed in accordance with the present invention
- Figure 2 is a perspective view of an alternative embodiment of the device for applying temperature differentials to the skin
- Figure 3 is a cross-sectional view along the line 3-3 of Figure 1 ;
- Figure 4 is an exploded perspective view of a portion of the device of Figures 1 and 3;
- Figure 5 is an exploded perspective view of a portion of the device of Figures 1 and 3;
- Figure 6 is a disassembled perspective view of a alternative embodiment of the somatosensory stimulation device of the present invention
- Figure 7 is a perspective view of the embodiment of the device of Figure 6 in use
- Figure 8 is a perspective view of the device of Figure 6 assembled for recharging of the power supply
- Figure 9 is a perspective view of another alternative embodiment of an apparatus constructed in accordance with the present invention.
- Figure 10 a sectional view of a water pump forming part of the apparatus of Figure 9; and Figure 11 is an exploded view of a portion of the fluid pump of Figure 9.
- a portable device for alleviating pain using somatosensory stimulation is shown generally at 20.
- Device 20 comprises a handle 22 to which a head 24 is pivotally attached at 26 using a bracket 28.
- Handle 22 encloses a power supply such as a rechargeable battery (not shown). Electrical connection to head 24 is made by wire 30 from the head to a plug 32 which in turn is electrically connected to the power supply.
- An on-off switch (not shown) is located in handle 22 for turning the power to head 24 on and off.
- Figure 2 shows an alternative embodiment of a hand-held device 200 similar to device 20.
- Head portion 204' has a hemispherical shape which functions in essentially the same way as head 24 of Figure 1.
- head 24 incudes a housing 40 having a front face 42 and a back face 44 and is provided with webbing 46 spaced therebetween.
- An aluminum block 48 is located within housing 40 between webbing 46 and front face 42.
- Aluminum block 48 comprises a solid section 50 containing a well 52 (best seen in Figure 4) with a planar perimeter 53 enclosing the well.
- Block 48 includes a finned section 54 adjacent to solid section 50.
- Finned section 54 is located adjacent to a fan 56 ( Figure 5) which when assembled is attached to webbing 46 on the interior of housing 40 as shown in Figure 3.
- thermoelectric unit 60 is located in recess 52 and is provided with a front face 62 and a back face 64. Back face 64 is in thermal contact with section 50 of block 48.
- the finned section 54 on block 48 in conjunction with fan 56 provide heat dissipation of excess heat generated by thermoelectric unit 60. Power from the power supply is fed to thermoelectric unit 60 and fan 56 through wires 68 and 70 respectively.
- Thermoelectric unit 60 utilizes the Peltier effect so that when an electric current is passed into unit 60 through wires 68 one side of unit 60 is heated up and the other side is cooled. In the configuration shown in Figure 3, side 64 is heated and side 62 is cooled.
- a typical thermoelectric unit 60 is shown as part of Figure 4 and is a Melcor CP1.0-127-06L or related model of dimensions 30 x 30 mm with an array of 127 thermoelectric elements 66 arranged in a rectangular pattern with power ratings between 5 to 25 Watts.
- Planar perimeter 53 extending around thermoelectric unit 60 is heated by surface 64 and surface 62 of the unit is cooled when the power is turned on.
- Fan 56 may for example be a 5 CFM 40x40x10mm fan as used for cooling central processing units in personal computers.
- the arrows in Figure 3 illustrate the flow path for air drawn by fan 56 through the finned section 54 of block 48 for dissipation of heat. This is the preferred arrangement in order to provide the most efficient heat dissip
- thermoelectric unit 60 The power to thermoelectric unit 60 is controlled so that surface 53 does not exceed 45 to 50°C and surface 62 does not drop below about 0°C when in skin contact.
- the ratio of heated area to cooled area is not critical so that a higher fraction of the active area (which includes perimeter 53 and surface 62) may be cooled for better heat management. Improved energy management as well as a decrease of excess heat generation may be accomplished by periodically shutting off the power with the thermoelectric unit open or short circuited during the off time.
- FIG. 6 another alternative embodiment of the somatosensory stimulation device constructed in accordance with the present invention is shown generally at 80.
- head 24' is interchangeable between a strap 86 and handle 22'.
- An on-off switch 23 is shown on handle 22' for switching the power on and off to head 24'.
- Head 24' is provided with outwardly projecting protrusions 82 for pivotally attaching the head to a frame 84 which is connected to a longitudinal strap 86 which can be used to strap head 24' to the user's limb for extended usage.
- Electrical cords 68' and 70' are detachable from head 24' and in use are connected to the power source in handle 22' which in turn may be secured to for example the user's belt by clip 88.
- An AC adapter 90 is used for recharging the rechargeable power supply.
- Figure 7 shows device 80 strapped to a user's arm 92 and
- Figure 8 shows the device with the AC adapter 90 coupled to the rechargeable battery in handle 22' in the recharging mode.
- devices 20, 80 or 200 are used for applying heat and cold to adjacent skin areas in the vicinity of pain.
- the closely adjacent heated and cooled surfaces act to produce enhanced sensory stimulation, the higher the temperature differential providing higher levels of stimulation.
- the purpose of the present method of alleviating pain is to induce a high degree of somatosensory or neural stimulation in the vicinity of the pain, not to per se heat and/or cool muscles or dilate/contract blood vessels to affect blood flow.
- the maximum temperature range which can be safely withstood by tissue under prolonged exposure is about 0 to 45°C without permanent tissue damage.
- the ratio of hot to cold surface areas is chosen to provide the necessary neural stimulation on the one hand and on the other hand keeping providing heat management or dissipation.
- the method of the present invention is to provide spatially modulated temperature differentials by the simultaneous application of hot and cold on the skin adjacent to or in the vicinity of pain.
- the present invention provides enhanced somatosensory stimulation by concurrently heating and cooling adjacent skin areas in the vicinity of pain to a large but safe temperature differential.
- the prior methods that employ heat and/or cold sequentially for somatosensory stimulation to block pain are limited because of adaptation or habituation to the sensation. In all these cases the treatments are similar to naturally occurring phenomena and hence the body has built in methods of adaptation.
- large spatially modulated temperature differences within confined areas on the skin surface are generally artificial and accordingly the brain has no mechanism to habituate or adapt other than through total suppression of all signals from stimuli, including pain, from the affected area. Hence, the limitations inherent in sequential heat or cold treatments resulting from habituation or adaptation responses of the brain are reduced.
- the resulting somatosensory stimulation is superior to temporal modulation since the same neural pathways are simultaneously flooded with hot and cold stimulation so the resulting brain response to habituate to the heat causes enhancement of the sensation of cold and conversely habituation to cold serves to increase the sensation of heat, hence any brain response to adapt to one sensation is self-defeating since it causes increased sensitivity to the other.
- the term "vicinity" as used herein to describe the application of heat and cold concurrently to the skin in the "vicinity" of pain is used to define that area around the pain locus to which the hot and cold are applied so that the same neural pathways involved with transmitting pain signals are utilized in transmitting the hot and cold signals. Thus, as long as the same neural pathways are flooded with hot and cold, the application of hot and cold may not need to be at the pain locus directly.
- adjacent refers to the amount of separation between the heated and cooled areas necessary to give the aforementioned result so the spacing between areas of hot and cold may vary in a range from being contiguous to a finite separation to give the desired somatosensory stimulation.
- a temperature differential of 20-45°C is preferred.
- Apparatus 100 is a table top plug-in unit which operates with between 50 to 200 watts input power and provides a larger surface area pad 102 having a heated section 104 adjacent to a cooled section 106.
- a power supply 108 provides power through electrical leads 115 to a thermoelectric unit 110 located between two identical water pumps 112 and 114. Pump 112 through which the heated water is flowed is in flow communication with a heat exchanger 116 provided with a fan 118 for dissipating excess heat.
- Power supply 108 provides power to fan 118 through leads 119. Water is supplied to the hot and cold sides from a water tank 120 and a microprocessor (not shown) may be integrated into the system for temperature control.
- FIGS 10 and 11 show in greater detail the hot side of the water pump system comprising pump 112 having a motor housing 136, and a housing 138 attached to motor housing 136.
- Housing 138 defines a first chamber 140 and an impeller enclosure 142.
- Chamber 140 is separated from impeller enclosure 142 by a disc 144 having a central aperture 146 to provide a fluid flow pathway between chamber 140 and impeller enclosure 142.
- Housing 138 has an open end portion 143 ( Figure 11) and enclosure 142 and thermoelectric unit 110 is attached to housing 138 at open end portion 143.
- Side 126 of thermoelectric unit 110 is cooled and side 128 is heated when the current is switched on.
- Pump 112 includes an impeller 148 mounted for rotation on a motor shaft 150 which passes through a seal 152 into housing 136 where it is operably coupled to the motor.
- Impeller 148 is spaced from surface 128 of the thermoelectric unit by about 1mm, best seen in Figure 10.
- An O-ring 154 between thermoelectric unit 110 and housing 138 provides a water seal.
- the fluid flow system includes a large water inlet tube 158 to introduce water from tank 120 into first chamber 140 in housing 138.
- This inlet allows for cross-flow exchange of liquid and air but does not provide recirculation.
- an air escape passageway 160 extending from enclosure 142 to the interior of tube 158 is provided for exhausting trapped air or allowing air to vent out of the pump 112 thereby permitting the system to automatically prime and provide a static pressure on the system.
- Passageways 164 extend through the side walls of housing 138 which provide fluid flow communication between first chamber 140 and tubes 166 and 182 shown in Figure 11.
- passageways 170 seen in Figure 10 extend through the side walls of housing 138 to provide fluid flow communication between impeller enclosure 142 and water outlet tubes 172 and
- water inlet tubes 158 extend up through the bottom of tank 120 and each has an end portion 122 which is spaced above the water level. Tubes 158 are provided with holes 124 just above the bottom of tank 120, more clearly visible in Figure 10. Water flows through from tank 120 down through holes 124 into inlet tubes 158 into first chamber 140, through passageway 146 into impeller enclosure 142 and passes over heated/cooled surfaces 128 and 126 respectively of thermoelectric unit 110 and out water outlet tubes 172.
- This water flow system comprising inlet tube 158, chamber 140, enclosure 142, air exhaust 160 and recirculation tubes
- 166, 172, 178 and 182 provides for cross-flow exchange of liquid and air but does not provide for recirculation between tank 120 and the pumps.
- pump 114 When device 100 is assembled as shown in Figure 9, pump 114 is attached adjacent to side 126 of thermoelectric unit 110 and the pump is essentially identical to pump 112 just described above and water circulated over surface 126 of the thermoelectric unit is cooled except the water does not pass through heat exchanger 116. Tubes 178 and 182 on one side of pump 112 conduct heated water to heat exchanger 116 while for the cooled side with pump 114 the corresponding recirculation tubes (not shown) would not be used. Tubes 166 and 172 on the other side of pump 112 recirculate heated water to and from heated section 104 of water bag 102 and the corresponding tubes on pump 114 recirculate cold water to and from cooled section 106 of water bag 102.
- thermoelectric unit 110 The configuration of pumps 112 and 114 each with an impeller 148 located adjacent to opposite sides of thermoelectric unit 110 is very advantageous in that it provides significantly more efficient heat transfer between the thermoelectric unit and the water compared to previous designs in which the pump is spaced away from the water heater and/or water cooler.
- rotating impeller 148 right adjacent to the surface of thermoelectric module 110 provides enhanced heat transfer (fluid shear against the heated/cooled surface) into the fluid thereby increasing the efficiency and cooling power over prior art devices.
- the centrifugal effect created by the rotating impeller acts to create a pressure differential to give a pumping action useful for mixing the heat transfer liquid and for pumping the fluid through the systems to the components being cooled and heated.
- Using a single thermoelectric unit 110 to both heat and cool the water with pumps 112 and 114 mounted on either side of the unit provides a more compact system.
- thermoelectric unit 110 is a Melcor CP 1 4-127-045L or similar device rated at 120 Watts with 15 Volts and 8 amps and a DC motor used to drive impeller 148 operates at 15 Volts below one ampere.
- heat exchanger 116 the water heating and cooling may be provided within safe physiological limits without the need for sophisticated and costly temperature and feedback control systems.
- Flexible pad 102 may be secured to any part of the body using tape, VELCROTM straps and the like and may be readily deformed to fit the contours of the body.
- Apparatus 100 may be modified so that the hot and cold sections 104 and 106 of water bag 102 are periodically switched to provide temporal temperature modulation in addition to spatial temperature modulation. This may be done for example by connecting a heat exchanger and fan to pump 114 so that the hot and cold sides of the apparatus are mirror images of each other. Then the hot and cold sides may be rapidly switched by means of a four way ball valve used to redirect and interchange the hot and cold fluid paths.
- thermoelectric unit 110 Another embodiment of the system may be provided which uses air cooling to cool the hot side of unit thermoelectric unit 110 (not shown).
- the devices disclosed herein are advantageous for several reasons. All the devices require only one thermoelectric unit to produce both hot and cold. The heat produced as a byproduct of cooling one side of the unit is used to heat the adjacent area using heat exchangers or heat conductors. Waste heat in excess of that required to heat the skin contacting member is dissipated through forced convection so that this approach considerably reduces the cost of the device and ancillary controls compared to prior art devices.
Abstract
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU35160/95A AU3516095A (en) | 1994-09-30 | 1995-09-27 | Method and devices for producing somatosensory stimulation using temperature |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US08/316,352 US5628769A (en) | 1994-09-30 | 1994-09-30 | Method and devices for producing somatosensory stimulation using temperature |
US316,352 | 1994-09-30 |
Publications (2)
Publication Number | Publication Date |
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WO1996010379A2 true WO1996010379A2 (en) | 1996-04-11 |
WO1996010379A3 WO1996010379A3 (en) | 1996-08-01 |
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PCT/CA1995/000551 WO1996010379A2 (en) | 1994-09-30 | 1995-09-27 | Method and devices for producing somatosensory stimulation using temperature |
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US (1) | US5628769A (en) |
AU (1) | AU3516095A (en) |
CA (1) | CA2201504A1 (en) |
WO (1) | WO1996010379A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
CA2201504A1 (en) | 1996-04-11 |
WO1996010379A3 (en) | 1996-08-01 |
US5628769A (en) | 1997-05-13 |
AU3516095A (en) | 1996-04-26 |
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