US3901231A - Infusion pump apparatus - Google Patents
Infusion pump apparatus Download PDFInfo
- Publication number
- US3901231A US3901231A US440410A US44041074A US3901231A US 3901231 A US3901231 A US 3901231A US 440410 A US440410 A US 440410A US 44041074 A US44041074 A US 44041074A US 3901231 A US3901231 A US 3901231A
- Authority
- US
- United States
- Prior art keywords
- motor
- angulation
- syringe
- infusion pump
- piston
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/14212—Pumping with an aspiration and an expulsion action
- A61M5/14216—Reciprocating piston type
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S128/00—Surgery
- Y10S128/01—Motorized syringe
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S128/00—Surgery
- Y10S128/12—Pressure infusion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S128/00—Surgery
- Y10S128/13—Infusion monitoring
Definitions
- ABSTRACT Infusion pump apparatus for delivering intravenous fluid from a syringe to a patient so that volume may be accurately controlled between a small delivery rate and a large delivery rate is disclosed.
- the pump is adaptable to adjust the amplitude of the syringe stroke in order to accurately meter the volume of fluid delivered to a patient within a given time period.
- the pump may be employed in an oxygen atmosphere without creating a potentially dangerous condition likely to result in an explosion.
- An an optional feature a pressure sensitive arrangement which stops the pump in the event the resistance to flow of fluid becomes greater than that required for normal operation is also disclosed.
- the present invention relates to an infusion pump system and more particularly to a pump having a synchronous motor adaptable to move a piston of a surgical syringe to deliver to a patient predetermined accurately measured volumetric amounts of intravenous fluid.
- syringe pump that comprises a pump assembly adaptable to be either permanently affixed to a syringe or detachably connected thereto.
- a detachable syringe pump assembly is shown by Rosenberg in US. Pat. No. 3,447,479.
- Rosenberg discloses a pump driven by the combined efforts of a synchronous timing motor and an induction drive motor.
- induction motors There are inherent problems to be overcome combining operating characteristics of such drive motors; Among the problems encountered by induction motors are the continual making and breaking of electrical. contact with resultant arcing between contacts, the dis-; advantages of which are self-evident when one is re-. quired to operate a motor in an atmosphere wherein: free oxygen is present. Moreover, induction type mo-- tors are affected by variances in voltage and thus it isdifficult if not impossible to deliver with exactitude a: constant and closely controlled volume of intravenous" fluid wherein the power services may be irregular; thus,; the supply of energy to the pump may vary greatly with? resultant highly diverse amounts of fluid pumped into a patients veins.
- infusion pump apparatus for rectilinear pumping and delivery of fluid, e.g., l.V. solution to a patient, at an average rate which can be selected within a range of rates.
- the apparatus includes a novel rate selecting mechanism which includes means for defining an arcuate movement path and means for pivotally reciprocating the arcuate means.
- a driving linkage is coupled to reciprocate the pump and also coupled to be moved by the arcuate means while reciprocating along a range of positions on the arcuate path thereon.
- a range of defining member is coupled to the driving linkage for movement therewith and has a fixed pivot whose position is selectively variable. At any fixed pivot point the member limits the range of movement of the driving member along the arcuate path and thus fixes the stroke and average output of the pump.
- means are provided for sensing the pressure in fluid output and for stopping the pump or signaling a warning for sensed pressures over a preselected high value.
- This latter feature has the advantage of preventing damage to the patient should the l.V. capillary be inserted wrongly, e.g. into a muscle tissue.
- FIG. 1 is a perspective view of a portable stand adaptable to support a source of supply of intravenous fluid, infusion pump apparatus including a syringe pump and a motor drive assembly therefor.
- FIG. 2 is a perspective view of the syringe pump and drive assembly showing more specific details of its exterior construction.
- FIG. 3 is a vertical front sectional view through the pump and drive assembly with the front portion of the housing broken away so that the working parts of the drive assembly may be seen more clearly.
- the component parts of the assembly are shown in two positions, the solid lines showing the syringe piston fully extended, the dotted lines showing the syringe piston fully retracted, and defining a maximum amplitude of syringe stroke.
- FIG. 4 is a vertical front sectional view of the pump and drive assembly similar to FIG. 3 but showing the component parts operative between a position of complete piston extension and complete piston retraction, but defining an intermediate amplitude of syringe stroke.
- FIG. 5 is a vertical side sectional view through the drive assembly, taken along line 55 of FIG. 3, a front portion of the housing broken away to show more clearly the working parts thereof.
- the drive assembly is shown secured to a portion of a vertical column of the stand.
- FIG. 6 is a schematic diagram of a control circuit for use with the subject pump system.
- FIG. 7 is a schematic diagram of a control circuit similar to that shown in FIG. 6 employing a pressure sensitive device for use with the subject pump system.
- an'infusion pump apparatus 10 is shown mounted by a clamping arrangement on a vertical rod member 12 of a portable stand 14 adaptable to support an intravenous fluid storage bottle 16 from a hook member 18 disposed at an upper end of the rod member 12.
- pump apparatus 10 comprises a housing 20 having a front face member 22, side members 24, top 26 and bottom 28 members and a back plate 30.
- Front face member 22 may be remov ably secured to housing 20 as by machine screws 32.
- Face member 22 has imprinted thereon a scale 34 of incremental numbcrs corresponding to a desired .parametcr of operation for pumping of fluid by the appa; ratus.
- the-scale 34 shows a range of numbers from to 300 and refers to milliliters of fluid pumped per hour.
- Adjusting knob 36 is keyed in a known manner to an exterior portionof a shaft 38 FIG. 5) hereinafter described in detail disposed within the housing. rotation of the knob 36 serves to set the pump at a predetermined rate of delivery of fluid for infusion into the veins of a patient and the volume of fluid flow is indicated by a fingcr 39 formed integrally withand extending outwardly from knob 36.
- Adjusting knob 36 must include a friction loaded shaft provision or other means (such as a lock knob) to insure that it will main tain itself in any desired selected position to have the apparatus pump the required flow of fluid.
- the friction shaft or other provisions are needed to overcome a small tendency of the hereinafter described variable rate mechanism to shift the setting.
- a knurled member 42 is located exteriorly of the face 22 and iskeyed to a portion of a shaft 44 (FIG. 5) extensive exteriorly of the housing.
- the knurled member 44 is effective when rotated to move a magnetic switch 46 assembly (FIGS. 3 and 4) between off and on positions to activate the pump apparatus.
- a magnetic switch 46 assembly (FIGS. 3 and 4) between off and on positions to activate the pump apparatus.
- the switch is preferably of the type shown, the present invention, at least in its broader aspects, contemplates the use of alternative switches such as the conventional toggle switch.
- An operation or on light 150 is disposed -in face member 22 and serves to indicate that the apparatus flange62 formed thereon adapted to be securablyand pivotally received by a yoke 64 carved from an exterior end of a lever member 66 (hereinafter described in detail).
- the rod member has an inner end formed toprovide a piston (not shown) head or plunger adaptable to move reciprocat'ingly within the body 56 of the syringe 58.
- syringe 58 The upper end of syringe 58 is operatively con n ected. as is well known in the art to a valve arrangement68. (FIGS. 1 and 2) that permits flow offluid therethrough of syringe 58 isa" rodmember 60 having a circular only to the patient and prevents back flow of solution into the bottle 16 when rod member moves upwardly to cause pressure to be exerted in valve arrangement 68.
- This is preferably a pair of one-way valves permitting flow only from I.V. bottle 16 to syringe 58 and from syringe S8 to the patient-connected line.
- a synchronous electrical motor 98 (FIG. 5) is secured to a back side of mounting plate 72 and is adaptable to rotate a drive shaft 100 that extends through a mounting plate aperture 102 having a diameter somewhat larger. than the diameter of the drive shaft.
- the drive shaft 100 is keyed or otherwise affixed to an cecentric member 104.
- the member 104 has an outboard end that pivotally receives a pin 106 secured in one end of a pivot link 108.
- Pivot link 108 has secured in its other end a pin 1.10 pivotally received by the aperture formed in the second leg 78B of U.-shaped member 78.
- a range defining member 112 has one end 114 pivotally secured to link member 90 and extends to connect its other end in pivotal engagement at IlZP with one end of a rod member 116.
- the other end of rod member 116 is secured to shaft 38 and rotates coincidentally therewith.
- shaft 38 is connected to and controlled by adjusting knob 36.
- control knob selects or fixes the posi tion of pivot 112? and this in turn controls through range of positions that pivot 96 can travel on arcuate path 82 (considering the relative movement between arcuate means 78 and the pivot 96.)
- This determines the vertical strokc distance of driving linkage 90 and thus.(through arm 66) of the pump stroke the syringe 58.
- the rate of reciprocating of the syringe plunger is determined by the rotation of the motor 98 which is preferably fixed so that the position determines the average pumpingrate. s
- calibration means 1 l8 is provided comprising a block 120, a first adjustment screws 122 threadably receivable therethrough for establishing a minimum adjustrnent position and-a second adjustment screw I24 threadably receivable by the block for establishing a maximum adjustment position of the shaft 38. It should be noted that either screw when th r caded inwaidly or outawrdly of the block will; upon rotation of shaft 38,
- the Unit 10 is designed to be connected to the commonly available AC power mains (60 hz, 120 v) via a conventional three prong plug 134 which includes a separate ground male prong for connection to ground.
- AC power mains 60 hz, 120 v
- a conventional three prong plug 134 which includes a separate ground male prong for connection to ground.
- the added ground wiring system is commonly used in hospitals in the US. and provides additional protection against electrical shock and leakage currents which could be very dangerous in this environment of use.
- the plug 134 has three conductors 134A, 134C and 1346 leading to the unit 10.
- Conductors 134A and 134C are for the convention AC power and conductor 1346 is connected to the ground prong of plug 134.
- the ground wire 134G is connected to a terminal 146 of a terminal block 132.
- the terminal146 is securely electrically and physically connected to the housing of the unit 10 to ground that housing.
- the AC power line 134A is connected through a terminal 133 on block 132 to one side of the switch 130.
- the switch 130 comprised an insulated sealed envelope housing 130H and a pair of switch blades normally mechanically biased apart switch blades 1308 which are made of magnetic material. When the magnet 126 is moved to the horizontal position the magnetic flux causes the blades to move together and complete the connection through the switch 130.
- switch 130 is connected via a line 136, terminal 138 and line 140 to the motor 98 of the pump assembly.
- the other side of the motor connects by a wire 142 with a post 144 of the terminal assembly 132 which part is, in turn, connected to the power input line 134C of the power cord.
- the indicator light 150 is connected between wires 140 and 142, and is lighted to signal when the motor is running and is off when the motor is shut down.
- a second preferred embodiment of the invention is illustrated employing, in accordance with a feature of the present invention, means 152 for sensing pressure in the l.V. line to the patient and for automatically shutting off the pump unit 10 in response to a sensed pressure over a selected level.
- This means 152 in this embodiment, includes a closed housing 152H having a diaphragm 152D which is in pressure communication (via a noncompressive, non-conductive fluid in zone 152A and a flexible diaphragm 1521 with the [.V. line to the patent.
- a diaphragm 152D which is in pressure communication (via a noncompressive, non-conductive fluid in zone 152A and a flexible diaphragm 1521 with the [.V. line to the patent.
- a two prong plug 160 is adaptable to be received by receptacle 154 and includes the two wires 162; 164 leading from the pressure sensitive switch 168.
- a relay switch arrangement 172 is disposed along the wire 158 of the device and includes an indicator light 174 for warning-of an overpressure. It should be noted that in the event pressure sensor 152 reads a pressure considered inimical to the operation of the system, switch 168 will open, causing the light 174 :to light and, more importantly the interruptionof current flow through switch 172 to shut down motor 98 even thoughmagnetic switch 130 remains in a closed position.
- a supply of intravenous fluid is attached to a stand and from the supply conduit means is connected through the pump apparatus 10 to a vein of a patient as is well known.
- the pump apparatus is set to a desired'flow of fluid by rotating adjusting knob 36 to the selected point as indicated on scale 34.
- Knob'42 is rotated from the off to on position and the motor will begin operation to cause'the syringe piston to reciprocate in cylinder 56,alternat 'ely drawing fluid into one-way arrangement means '68 on a retraction stroke and forcing fluid out of this means 68 into a vein of apatient on an extension stroke;
- the fluid flow setting as accomplished by'rotating knob 36 is translated into a desired volume of fluid flow by varying amplitude of the syringe piston between positions of full retraction and extension.
- Rotation of knob 36 causes rod 116 to turn between the screws 122, 124 of the calibration means 118 to have indicator arm 39 point to a desired number on scale 34.
- I v I Rotational movement of rod 1 16 to a desired position between, threadably adjustable screws 122 and 124 forces bar member 112, by virtue of its pinned and articulated relationship with the link 90, to position the link in a desired position along the curvilinear path defined by grooves 82 formed in the member 78.
- the link 90 having one end positioned in grooves 82 and its other end secured substantially intermediate the ends of lever 66 is effective to move the lever 66 through an acutate angle about its end 70 pivotally secured to mounting plate 72.
- eccentric 104 rotation of eccentric 104 by the motor causes pivot link 108 to urge the free end 88 of member 78 upwardly and downwardly and thereby define angular displacement about the end 84 of member 78 pivotally secured to the mounting plate.
- Link 90 positioned in grooves 82 of member 78 and connected to lever 66 causes the lever to rotate about its end 70.
- the lever in turn translates its angular movement to the rod of the piston syringe 58 and by virtue of its pivotal connection therewith, causes the piston to move rectilinearly and reciprocatingly within the cylinder of the syringe.
- the cooperative construction of the present invention makes it possible by interrelated structure to combine in a unique arrangement angular motion with rectilinear motion to establish a desired amplitude of stroke for a piston syringe. It should be noted that positioning the end 94 of link at any desired point along the curvilinear path defined by grooves 82 is effective to change the amplitude of the piston stroke and thereby deliver to a patients vein a highly accurate and closely controlled volume of intravenous fluid.
- Infusion pump apparatus with an adjustable piston stroke amplitude for reciprocating a piston within a syringe to deliver fluid comprising:
- angulation means pivotally disposed in said housing and operatively connected to said piston to cause said reciprocation of said piston in said syringe; arcuate means pivotally disposed in said housing operatively connected to said angulation means; said arcuate means adaptable to adjustably determine said piston stroke amplitude by varying the displacement of said angulation means: motor means connnected to said arcuate means operable to reciprocate said angulation means through said angular displacement; and
- said calibration means comprising (a) means for preselecting the fluid flow rate of said infusion pump apparatus by adjusting said displacement of said angulation means, and (b) adjusting means for establishing the minimum and maximum displacement of said angulation means.
- said angulation means comprises lever means having one end pivotally secured within said housing, said arcuate means comprising a substantially Ushaped member having a middle portion shaped to form a portion of an arc and having grooves formed in said middle portion to define a curvilinear path, link means connected between a point substantially intermediate the ends of said lever means and a point adjustably positioned along said curvilinear path of said U-shaped member, said point of position of said link means along the curvilinear path of said U-shaped member being effective to control the angular distance traveled by said lever and thereby control the amplitude of the syringe piston.
- said motor means comprises a brushless synchronous electric motor, and magnetic switch means for controlling said motor means between on and off positions, said motor means and said magnetic switch means being adaptable to operate safely in an explosive atmosphere when said switch controls said motor in an operable condition or causes said motor to turn on or off.
- said motor means comrises a synchronous motor adaptable to operate safely in an explosive atmosphere, an eccentric member keyed to a shaft rotatable by said motor, and a pivot link having one end pivotally connected to said eccentric member and another end pivotally connected to the point of position between said arcuate means and said link means located on the curvilinear path of said U-shaped member.
Abstract
Infusion pump apparatus for delivering intravenous fluid from a syringe to a patient so that volume may be accurately controlled between a small delivery rate and a large delivery rate is disclosed. The pump is adaptable to adjust the amplitude of the syringe stroke in order to accurately meter the volume of fluid delivered to a patient within a given time period. The pump may be employed in an oxygen atmosphere without creating a potentially dangerous condition likely to result in an explosion. An an optional feature a pressure sensitive arrangement which stops the pump in the event the resistance to flow of fluid becomes greater than that required for normal operation is also disclosed.
Description
[11] 3,901,231 Aug. 26, 1975 INFUSION PUMP APPARATUS [75] Inventor: Raymond 6. Olson, Niles, 111.
[73] Assignee: Baxter Laboratories, Inc., Morton Grove, Ill.
[22] Filed: Feb. 7, 1974 [21] Appl. No.-:440,4l0
[52] US. Cl. 128/214 F; 128/218 R; 92/13]; l28/D1G, 1; 128/010. 12; 128/D1G. 13
[51] Int. Cl. A6lm 5/00 [58] Fieldoiseal'clt 128/214 E,2l4 F,218 A, 128/218 R, 218 G, DIG. l, DIG. l2, DIG. 13;
5/1973 Wilhclmson ct a1 l28/D1G. l 6/1974 Fumagalli 92/l3.7
Primary Examiner-Richard A. Gaudet Assistant Examiner-Henry S. Layton [57] ABSTRACT Infusion pump apparatus for delivering intravenous fluid from a syringe to a patient so that volume may be accurately controlled between a small delivery rate and a large delivery rate is disclosed. The pump is adaptable to adjust the amplitude of the syringe stroke in order to accurately meter the volume of fluid delivered to a patient within a given time period. The pump may be employed in an oxygen atmosphere without creating a potentially dangerous condition likely to result in an explosion. An an optional feature a pressure sensitive arrangement which stops the pump in the event the resistance to flow of fluid becomes greater than that required for normal operation is also disclosed.
5 Claims, 7 Drawing Figures PATENTEU Auszs 197s SHIT 1 BF 4 PATIENT PATENTEBAUBZSIQTS" 3.9019231 T0 i T0 PATIENT PATIENT l V SOLUTION mrusrou PUMP APPARATUS The present invention relates to an infusion pump system and more particularly to a pump having a synchronous motor adaptable to move a piston of a surgical syringe to deliver to a patient predetermined accurately measured volumetric amounts of intravenous fluid.
The use of surgical syringes for injecting intravenous fluid into the veins of a pateint has long been known. It is common practice to employ a syringe comprising a cylinder and a piston reciprocatingly disposed therein to cause fluid to 'move from a source of supply to a patient who requires a constant and measured amount of the fluid for purposes of life sustaining nourishment or other aspects of medicinal treatment.
Various means may be utilized to operate the piston of a syringe. The most elementary means for causing movement of a piston would be pressing by hand against a rod portion of the piston extending exteriorly of the cylinder, thereby forcing the head of the piston to move rectilinearly and pump fluid from the supply source to the patient. Modern technology has developed more advanced and sophisticated means for delivering fluid from a source of supply by means of a syringe. In this connection, electromechanical devices have been created that automatically move a piston or plunger of a syringe to cause fluid to be pumped to a patient who requires the adminstering of intravenous fluid to obtain nutrients for sustaining life.
Illustrative of devices that may be used to pump intravenous fluid is a so called syringe pump that comprises a pump assembly adaptable to be either permanently affixed to a syringe or detachably connected thereto. A detachable syringe pump assembly is shown by Rosenberg in US. Pat. No. 3,447,479. However Rosenberg discloses a pump driven by the combined efforts of a synchronous timing motor and an induction drive motor.
There are inherent problems to be overcome combining operating characteristics of such drive motors; Among the problems encountered by induction motors are the continual making and breaking of electrical. contact with resultant arcing between contacts, the dis-; advantages of which are self-evident when one is re-. quired to operate a motor in an atmosphere wherein: free oxygen is present. Moreover, induction type mo-- tors are affected by variances in voltage and thus it isdifficult if not impossible to deliver with exactitude a: constant and closely controlled volume of intravenous" fluid wherein the power services may be irregular; thus,; the supply of energy to the pump may vary greatly with? resultant highly diverse amounts of fluid pumped into a patients veins.
BRIEF SUMMARY OF THE INVENTION In accordance with a major feature of the present irivention infusion pump apparatus is provided for rectilinear pumping and delivery of fluid, e.g., l.V. solution to a patient, at an average rate which can be selected within a range of rates. The apparatus includes a novel rate selecting mechanism which includes means for defining an arcuate movement path and means for pivotally reciprocating the arcuate means. A driving linkage is coupled to reciprocate the pump and also coupled to be moved by the arcuate means while reciprocating along a range of positions on the arcuate path thereon.
A range of defining member is coupled to the driving linkage for movement therewith and has a fixed pivot whose position is selectively variable. At any fixed pivot point the member limits the range of movement of the driving member along the arcuate path and thus fixes the stroke and average output of the pump.
In accordance with another feature of the invention means are provided for sensing the pressure in fluid output and for stopping the pump or signaling a warning for sensed pressures over a preselected high value.
This latter feature has the advantage of preventing damage to the patient should the l.V. capillary be inserted wrongly, e.g. into a muscle tissue.
These and other features and advantages of the invention will become apparent from the ensuing description, reference being had to the accompanying drawings, in which like members are used to identify like elements in the several views.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a portable stand adaptable to support a source of supply of intravenous fluid, infusion pump apparatus including a syringe pump and a motor drive assembly therefor.
FIG. 2 is a perspective view of the syringe pump and drive assembly showing more specific details of its exterior construction.
FIG. 3 is a vertical front sectional view through the pump and drive assembly with the front portion of the housing broken away so that the working parts of the drive assembly may be seen more clearly. The component parts of the assembly are shown in two positions, the solid lines showing the syringe piston fully extended, the dotted lines showing the syringe piston fully retracted, and defining a maximum amplitude of syringe stroke.
FIG. 4 is a vertical front sectional view of the pump and drive assembly similar to FIG. 3 but showing the component parts operative between a position of complete piston extension and complete piston retraction, but defining an intermediate amplitude of syringe stroke. 1
FIG. 5 is a vertical side sectional view through the drive assembly, taken along line 55 of FIG. 3, a front portion of the housing broken away to show more clearly the working parts thereof. The drive assembly is shown secured to a portion of a vertical column of the stand.
FIG. 6 is a schematic diagram of a control circuit for use with the subject pump system.
FIG. 7 is a schematic diagram of a control circuit similar to that shown in FIG. 6 employing a pressure sensitive device for use with the subject pump system.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, an'infusion pump apparatus 10 is shown mounted by a clamping arrangement on a vertical rod member 12 of a portable stand 14 adaptable to support an intravenous fluid storage bottle 16 from a hook member 18 disposed at an upper end of the rod member 12.
As seen more clearly in FIG. 2 pump apparatus 10 comprises a housing 20 having a front face member 22, side members 24, top 26 and bottom 28 members and a back plate 30. Front face member 22 may be remov ably secured to housing 20 as by machine screws 32.
Access to the interior of the housing is accomplished by unthreading the screws and removing face member 22 from the housing. I
A knurled member 42 is located exteriorly of the face 22 and iskeyed to a portion of a shaft 44 (FIG. 5) extensive exteriorly of the housing. The knurled member 44 is effective when rotated to move a magnetic switch 46 assembly (FIGS. 3 and 4) between off and on positions to activate the pump apparatus. Although the switch is preferably of the type shown, the present invention, at least in its broader aspects, contemplates the use of alternative switches such as the conventional toggle switch.
An operation or on light 150 is disposed -in face member 22 and serves to indicate that the apparatus flange62 formed thereon adapted to be securablyand pivotally received by a yoke 64 carved from an exterior end ofa lever member 66 (hereinafter described in detail). The rod member has an inner end formed toprovide a piston (not shown) head or plunger adaptable to move reciprocat'ingly within the body 56 of the syringe 58. i
The upper end of syringe 58 is operatively con n ected. as is well known in the art to a valve arrangement68. (FIGS. 1 and 2) that permits flow offluid therethrough of syringe 58 isa" rodmember 60 having a circular only to the patient and prevents back flow of solution into the bottle 16 when rod member moves upwardly to cause pressure to be exerted in valve arrangement 68. This is preferably a pair of one-way valves permitting flow only from I.V. bottle 16 to syringe 58 and from syringe S8 to the patient-connected line.
Referringnow to FIGS. 3, 4, and 5, it can be seen that of pivot ll2P byfixing the stroke pair of arcuate.grooves 82..Ihefifstleg-7:8A= has its end 84 pivotally connected at 86 to the mounting plate 72.
A first link driving mcmber 90 has a first end 92 'pivotally secured substantially intermediate "the ends of lever 66 and has a second end,94 secured as bypins 96 received in the arcuate grooves 82 of membcr=78. It should be noted that the second end 94 of link 90 may be assumed positions along an arcuate path defined by the grooves 82 formed in the middle portion member A synchronous electrical motor 98 (FIG. 5) is secured to a back side of mounting plate 72 and is adaptable to rotate a drive shaft 100 that extends through a mounting plate aperture 102 having a diameter somewhat larger. than the diameter of the drive shaft. ,The drive shaft 100 is keyed or otherwise affixed to an cecentric member 104. The member 104 has an outboard end that pivotally receives a pin 106 secured in one end of a pivot link 108. Pivot link 108 has secured in its other end a pin 1.10 pivotally received by the aperture formed in the second leg 78B of U.-shaped member 78.
A range defining member 112 has one end 114 pivotally secured to link member 90 and extends to connect its other end in pivotal engagement at IlZP with one end of a rod member 116. The other end of rod member 116 is secured to shaft 38 and rotates coincidentally therewith. As hereinbefore described shaft 38 is connected to and controlled by adjusting knob 36.
Note that the control knob selects or fixes the posi tion of pivot 112? and this in turn controls through range of positions that pivot 96 can travel on arcuate path 82 (considering the relative movement between arcuate means 78 and the pivot 96.) This, however, in accordance with a major feature of the present invention determines the vertical strokc distance of driving linkage 90 and thus.(through arm 66) of the pump stroke the syringe 58. The rate of reciprocating of the syringe plungeris determined by the rotation of the motor 98 which is preferably fixed so that the position determines the average pumpingrate. s
The pump unit as described has bee'nconstructed and tested. Empirical data has established that a near linear relationship can be made to-exist between the setting of knob 36 and-the flow rate and that the average rate of pumping can be precisely controlled over a satisfactory range. y
In order to control the rotation-of shaft 38 between minimum and maximum limit positions. asindicatcd on scale 34, calibration means 1 l8 isprovided comprising a block 120, a first adjustment screws 122 threadably receivable therethrough for establishing a minimum adjustrnent position and-a second adjustment screw I24 threadably receivable by the block for establishing a maximum adjustment position of the shaft 38. It should be noted that either screw when th r caded inwaidly or outawrdly of the block will; upon rotation of shaft 38,
establish a contact point with-either edge of rod member 116 and thereby prevent furtherrotation of shaft 38. Thus. it is possible to adjust the rotation'of shaft 38 between minimum and maximum positions so that-opposite correspondence is I maintained with scale 34 whenknob 36 is turned to rotate shaft 38 and thereby select a desired rate of fluid infusion.
It can be seen that rotation of knurled knob 42 causes a magnetic arm I26 affixied thereto'to rotate therewith throughout an angle of substantially-90 as defined by limit pin 128 protruding from the mounting plate and an exterior side of an enclosed magnetic switch 130 secured as by screws to the mounting plate 72. The pump assembly is inoperative when magnetic arm 126 is engaged with pin 128 and becomes operative when magnetic arm 126 is rotated by knob 42 into contact with magnetic switch 130. Magnetic switch 130 is wired in a known manner. to an insulated terminal assembly 132 (FIGS. 6 and 7) secured to the mounting plate 72.
Referring now to FIG. 6, the Unit 10 is designed to be connected to the commonly available AC power mains (60 hz, 120 v) via a conventional three prong plug 134 which includes a separate ground male prong for connection to ground. Of course, other power sources and double insulation may be employed without departing from the invention. However, the added ground wiring system is commonly used in hospitals in the US. and provides additional protection against electrical shock and leakage currents which could be very dangerous in this environment of use.
The plug 134 has three conductors 134A, 134C and 1346 leading to the unit 10. Conductors 134A and 134C are for the convention AC power and conductor 1346 is connected to the ground prong of plug 134.
The ground wire 134G is connected to a terminal 146 of a terminal block 132. The terminal146 is securely electrically and physically connected to the housing of the unit 10 to ground that housing.
The AC power line 134A is connected through a terminal 133 on block 132 to one side of the switch 130. As best shown in FIG. 6, the switch 130 comprised an insulated sealed envelope housing 130H and a pair of switch blades normally mechanically biased apart switch blades 1308 which are made of magnetic material. When the magnet 126 is moved to the horizontal position the magnetic flux causes the blades to move together and complete the connection through the switch 130.
The other side of switch 130 is connected via a line 136, terminal 138 and line 140 to the motor 98 of the pump assembly. The other side of the motor connects by a wire 142 with a post 144 of the terminal assembly 132 which part is, in turn, connected to the power input line 134C of the power cord.
The indicator light 150 is connected between wires 140 and 142, and is lighted to signal when the motor is running and is off when the motor is shut down.
ln HO. 7 a second preferred embodiment of the invention is illustrated employing, in accordance with a feature of the present invention, means 152 for sensing pressure in the l.V. line to the patient and for automatically shutting off the pump unit 10 in response to a sensed pressure over a selected level.
This means 152, in this embodiment, includes a closed housing 152H having a diaphragm 152D which is in pressure communication (via a noncompressive, non-conductive fluid in zone 152A and a flexible diaphragm 1521 with the [.V. line to the patent. When the pressure in the IV chamber 152C rises above a threshold level, it moves diaphragm 152D to break the contact of a switch 168 and disconnect the connection between lines 162 and 164.
A two prong plug 160 is adaptable to be received by receptacle 154 and includes the two wires 162; 164 leading from the pressure sensitive switch 168. A relay switch arrangement 172 is disposed along the wire 158 of the device and includes an indicator light 174 for warning-of an overpressure. It should be noted that in the event pressure sensor 152 reads a pressure considered inimical to the operation of the system, switch 168 will open, causing the light 174 :to light and, more importantly the interruptionof current flow through switch 172 to shut down motor 98 even thoughmagnetic switch 130 remains in a closed position.
In the operation of the present invention, a supply of intravenous fluid is attached to a stand and from the supply conduit means is connected through the pump apparatus 10 to a vein of a patient as is well known. The pump apparatus is set to a desired'flow of fluid by rotating adjusting knob 36 to the selected point as indicated on scale 34. Knob'42 is rotated from the off to on position and the motor will begin operation to cause'the syringe piston to reciprocate in cylinder 56,alternat 'ely drawing fluid into one-way arrangement means '68 on a retraction stroke and forcing fluid out of this means 68 into a vein of apatient on an extension stroke;
The fluid flow setting as accomplished by'rotating knob 36 is translated into a desired volume of fluid flow by varying amplitude of the syringe piston between positions of full retraction and extension. Rotation of knob 36 causes rod 116 to turn between the screws 122, 124 of the calibration means 118 to have indicator arm 39 point to a desired number on scale 34. I v I Rotational movement of rod 1 16 to a desired position between, threadably adjustable screws 122 and 124 forces bar member 112, by virtue of its pinned and articulated relationship with the link 90, to position the link in a desired position along the curvilinear path defined by grooves 82 formed in the member 78. The link 90 having one end positioned in grooves 82 and its other end secured substantially intermediate the ends of lever 66 is effective to move the lever 66 through an acutate angle about its end 70 pivotally secured to mounting plate 72.
It can be seen that rotation of eccentric 104 by the motor causes pivot link 108 to urge the free end 88 of member 78 upwardly and downwardly and thereby define angular displacement about the end 84 of member 78 pivotally secured to the mounting plate. Link 90 positioned in grooves 82 of member 78 and connected to lever 66 causes the lever to rotate about its end 70. The lever in turn translates its angular movement to the rod of the piston syringe 58 and by virtue of its pivotal connection therewith, causes the piston to move rectilinearly and reciprocatingly within the cylinder of the syringe. Thus, it can be seen that the cooperative construction of the present invention makes it possible by interrelated structure to combine in a unique arrangement angular motion with rectilinear motion to establish a desired amplitude of stroke for a piston syringe. It should be noted that positioning the end 94 of link at any desired point along the curvilinear path defined by grooves 82 is effective to change the amplitude of the piston stroke and thereby deliver to a patients vein a highly accurate and closely controlled volume of intravenous fluid.
It is thought that the invention and many of its attendant advantages will be understood from the foregoing description and it will be apparent to those skilled in the art that various changes may be made in the form, construction and arrangement of the component parts without departing from the spirit and scope of the invention or sacrificing all its material advantages, the
form hereinbefore described being merely a preferred embodiment thereof.
I claim:
1. Infusion pump apparatus with an adjustable piston stroke amplitude for reciprocating a piston within a syringe to deliver fluid comprising:
a housing;
angulation means pivotally disposed in said housing and operatively connected to said piston to cause said reciprocation of said piston in said syringe; arcuate means pivotally disposed in said housing operatively connected to said angulation means; said arcuate means adaptable to adjustably determine said piston stroke amplitude by varying the displacement of said angulation means: motor means connnected to said arcuate means operable to reciprocate said angulation means through said angular displacement; and
calibration means cooperable with said operative connection between said angulation means and said arcuate means,
said calibration means comprising (a) means for preselecting the fluid flow rate of said infusion pump apparatus by adjusting said displacement of said angulation means, and (b) adjusting means for establishing the minimum and maximum displacement of said angulation means.
2. The infusion pump apparatus of claim 1 wherein said adjusting means comprises a plurality of threadably adjustable screws.
3. The infusion pump apparatus of claim 1 wherein said angulation means comprises lever means having one end pivotally secured within said housing, said arcuate means comprising a substantially Ushaped member having a middle portion shaped to form a portion of an arc and having grooves formed in said middle portion to define a curvilinear path, link means connected between a point substantially intermediate the ends of said lever means and a point adjustably positioned along said curvilinear path of said U-shaped member, said point of position of said link means along the curvilinear path of said U-shaped member being effective to control the angular distance traveled by said lever and thereby control the amplitude of the syringe piston.
4. The infusion pump apparatus of claim 1 wherein said motor means comprises a brushless synchronous electric motor, and magnetic switch means for controlling said motor means between on and off positions, said motor means and said magnetic switch means being adaptable to operate safely in an explosive atmosphere when said switch controls said motor in an operable condition or causes said motor to turn on or off. 5. The infusion pump apparatus of claim 3 wherein said motor means comrises a synchronous motor adaptable to operate safely in an explosive atmosphere, an eccentric member keyed to a shaft rotatable by said motor, and a pivot link having one end pivotally connected to said eccentric member and another end pivotally connected to the point of position between said arcuate means and said link means located on the curvilinear path of said U-shaped member.
Claims (5)
1. Infusion pump apparatus with an adjustable piston stroke amplitude for reciprocating a piston within a syringe to deliver fluid comprising: a housing; angulation means pivotally disposed in said housing and operatively connected to said piston to cause said reciprocation of said piston in said syringe; arcuate means pivotally disposed in said housing operatively connected to said angulation means; said arcuate means adaptable to adjustably determine said piston stroke amplitude by varying the displacement of said angulation means: motor means connnected to said arcuate means operable to reciprocate said angulation means through said angular displacement; and calibration means cooperable with said operative connection between said angulation means and said arcuate means, said calibration means comprising (a) means for pre-selecting the fluid flow rate of said infusion pump apparatus by adjusting said displacement of said angulation means, and (b) adjusting means for establishing the minimum and maximum displacement of said angulation means.
2. The infusion pump apparatus of claim 1 wherein said adjusting means comprises a plurality of threadably adjustable screws.
3. The infusion pump apparatus of claim 1 wherein said angulation means comprises lever means having one end pivotally secured within said housing, said arcuate means comprising a substantially U-shaped member having a middle portion shaped to form a portion of an arc and having grooves formed in said middle portion to define a curvilinear path, link means connected between a point substantially intermediate the ends of said lever means and a point adjustably positioned along said curvilinear path of said U-shaped member, said point of position of said link means along the curvilinear path of said U-shaped member being effective to control the angular distance traveled by said lever and thereby control the amplitude of the syringe piston.
4. The infusion pump apparatus of claim 1 wherein said motor means comprises a brushless synchronous electric motor, and magnetic switch means for controllinG said motor means between on and off positions, said motor means and said magnetic switch means being adaptable to operate safely in an explosive atmosphere when said switch controls said motor in an operable condition or causes said motor to turn on or off.
5. The infusion pump apparatus of claim 3 wherein said motor means comrises a synchronous motor adaptable to operate safely in an explosive atmosphere, an eccentric member keyed to a shaft rotatable by said motor, and a pivot link having one end pivotally connected to said eccentric member and another end pivotally connected to the point of position between said arcuate means and said link means located on the curvilinear path of said U-shaped member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US440410A US3901231A (en) | 1974-02-07 | 1974-02-07 | Infusion pump apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US440410A US3901231A (en) | 1974-02-07 | 1974-02-07 | Infusion pump apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US3901231A true US3901231A (en) | 1975-08-26 |
Family
ID=23748655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US440410A Expired - Lifetime US3901231A (en) | 1974-02-07 | 1974-02-07 | Infusion pump apparatus |
Country Status (1)
Country | Link |
---|---|
US (1) | US3901231A (en) |
Cited By (86)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3985133A (en) * | 1974-05-28 | 1976-10-12 | Imed Corporation | IV pump |
US3999542A (en) * | 1975-04-10 | 1976-12-28 | Shaw Robert F | Anti-clogging liquid administration apparatus and method |
DE2609699A1 (en) * | 1974-05-28 | 1977-09-15 | Imed Corp | Pump with predetermined flow rate and dispensed volume - has volumetric cassette with piston and piston delivery stroke control |
US4056333A (en) * | 1974-07-15 | 1977-11-01 | Valleylab | Intravenous feeding pump failure alarm system |
US4067332A (en) * | 1975-02-28 | 1978-01-10 | Ivac Corporation | Syringe pump drive system and disposable syringe cartridge |
US4078562A (en) * | 1976-08-16 | 1978-03-14 | Diana W. Friedman | Infusion pump with feedback control |
US4091810A (en) * | 1975-11-03 | 1978-05-30 | Valleylab | Method for intravenous feeding of a patient |
US4126132A (en) * | 1975-07-28 | 1978-11-21 | Andros Incorporated | Intravenous and intra arterial delivery system |
US4175474A (en) * | 1976-12-13 | 1979-11-27 | Elitex, Koncern Textilniho Strojirenstvi | Variable displacement pump |
US4178927A (en) * | 1975-11-03 | 1979-12-18 | Valleylab | Intravenous liquid delivery system |
US4264281A (en) * | 1978-05-11 | 1981-04-28 | Paul Hammelmann | Pump with an automatically adjusted output rate |
WO1982000590A1 (en) * | 1980-08-25 | 1982-03-04 | Travenol Lab Baxter | Metering apparatus with downline pressure monitoring system |
US4381006A (en) * | 1980-11-10 | 1983-04-26 | Abbott Laboratories | Continuous low flow rate fluid dispenser |
US4382753A (en) * | 1979-03-09 | 1983-05-10 | Avi, Inc. | Nonpulsating IV pump and disposable pump chamber |
US4391600A (en) * | 1979-03-09 | 1983-07-05 | Avi, Inc. | Nonpulsating IV pump and disposable pump chamber |
US4391599A (en) * | 1979-01-18 | 1983-07-05 | Imed Corporation | Apparatus for providing a controlled flow of intravenous fluid to a patient |
US4392847A (en) * | 1979-01-08 | 1983-07-12 | Whitney Douglass G | Injection and monitoring system |
US4410322A (en) * | 1979-03-09 | 1983-10-18 | Avi, Inc. | Nonpulsating TV pump and disposable pump chamber |
DE2660392C2 (en) * | 1976-03-06 | 1983-10-20 | Imed Corp., 92131 San Diego, Calif. | Piston pump arrangement for an infusion apparatus |
US4452251A (en) * | 1982-11-05 | 1984-06-05 | Medrad, Inc. | Syringe content indicating device |
US4468222A (en) * | 1976-05-24 | 1984-08-28 | Valleylab | Intravenous liquid pumping system and method |
US4674722A (en) * | 1985-11-18 | 1987-06-23 | Critikon, Inc. | Medical accessory pole clamp |
US4696671A (en) * | 1984-02-08 | 1987-09-29 | Omni-Flow, Inc. | Infusion system having plural fluid input ports and at least one patient output port |
US4816019A (en) * | 1986-03-04 | 1989-03-28 | Kamen Dean L | Infiltration detection system using pressure measurement |
US4828545A (en) * | 1984-02-08 | 1989-05-09 | Omni-Flow, Inc. | Pressure responsive multiple input infusion system |
US4838860A (en) * | 1987-06-26 | 1989-06-13 | Pump Controller Corporation | Infusion pump |
US4854836A (en) * | 1986-02-18 | 1989-08-08 | Baxter International Inc. | Collapsible conduit for linear peristaltic pump and method of making the same |
US4857048A (en) * | 1987-05-29 | 1989-08-15 | Hewlett-Packard Company | IV pump and disposable flow chamber with flow control |
US4898579A (en) * | 1987-06-26 | 1990-02-06 | Pump Controller Corporation | Infusion pump |
US5100380A (en) * | 1984-02-08 | 1992-03-31 | Abbott Laboratories | Remotely programmable infusion system |
GB2252798A (en) * | 1991-02-14 | 1992-08-19 | Danby Medical Ltd | Pumping arrangment for intravenous supply of fluids |
WO1993002627A1 (en) * | 1991-07-31 | 1993-02-18 | Mentor O&O Inc. | Controlling operation of handpieces during ophthalmic surgery |
US5232439A (en) * | 1992-11-02 | 1993-08-03 | Infusion Technologies Corporation | Method for pumping fluid from a flexible, variable geometry reservoir |
US5320503A (en) * | 1988-05-17 | 1994-06-14 | Patient Solutions Inc. | Infusion device with disposable elements |
US5342313A (en) * | 1992-11-02 | 1994-08-30 | Infusion Technologies Corporation | Fluid pump for a flexible, variable geometry reservoir |
US5395320A (en) * | 1992-06-09 | 1995-03-07 | Sabratek Corporation | Programmable infusion pump with interchangeable tubing |
US5462256A (en) * | 1994-05-13 | 1995-10-31 | Abbott Laboratories | Push button flow stop useable with a disposable infusion pumping chamber cassette |
US5584667A (en) * | 1988-05-17 | 1996-12-17 | Davis; David L. | Method of providing uniform flow from an infusion device |
US5609575A (en) * | 1994-04-11 | 1997-03-11 | Graseby Medical Limited | Infusion pump and method with dose-rate calculation |
US5620312A (en) * | 1995-03-06 | 1997-04-15 | Sabratek Corporation | Infusion pump with dual-latching mechanism |
US5628619A (en) * | 1995-03-06 | 1997-05-13 | Sabratek Corporation | Infusion pump having power-saving modes |
US5637093A (en) * | 1995-03-06 | 1997-06-10 | Sabratek Corporation | Infusion pump with selective backlight |
US5788674A (en) * | 1996-03-05 | 1998-08-04 | Medication Delivery Devices, Inc. | Apparatus and method for limiting free-flow in an infusion system |
US5795327A (en) * | 1995-03-06 | 1998-08-18 | Sabratek Corporation | Infusion pump with historical data recording |
US5803712A (en) * | 1988-05-17 | 1998-09-08 | Patient Solutions, Inc. | Method of measuring an occlusion in an infusion device with disposable elements |
US5816779A (en) * | 1994-05-13 | 1998-10-06 | Abbott Laboratories | Disposable fluid infusion pumping cassette having an interrelated flow control and pressure monitoring arrangement |
US5829723A (en) * | 1995-06-28 | 1998-11-03 | Medex, Inc. | Medical device mounting structure |
US5853386A (en) * | 1996-07-25 | 1998-12-29 | Alaris Medical Systems, Inc. | Infusion device with disposable elements |
US5904668A (en) * | 1995-03-06 | 1999-05-18 | Sabratek Corporation | Cassette for an infusion pump |
US5910110A (en) * | 1995-06-07 | 1999-06-08 | Mentor Ophthalmics, Inc. | Controlling pressure in the eye during surgery |
US5951510A (en) * | 1997-04-11 | 1999-09-14 | Nestec S.A. | Pump system with error detection for clinical nutrition |
USD418916S (en) * | 1998-09-16 | 2000-01-11 | Mentor Ophthalmics, Inc. | Tube set for surgical instrument |
US6468242B1 (en) | 1998-03-06 | 2002-10-22 | Baxter International Inc. | Medical apparatus with patient data recording |
WO2002087665A1 (en) * | 2001-04-26 | 2002-11-07 | Groening Ruediger | Pump for the time-controlled, metered administration of medicaments |
US20030069541A1 (en) * | 1999-03-09 | 2003-04-10 | Durect Corporation | Implantable device for access to a treatment site |
WO2003035138A2 (en) * | 2001-10-22 | 2003-05-01 | L.G. Med Ltd. | Method and device for detecting malfunction in a gravity fed intravenous delivery system |
US20050159708A1 (en) * | 2002-07-24 | 2005-07-21 | Rudolf Sidler | Infusion pump, control program, semiconductor means and method for the dosed administration of a medicinal liquid |
US20050197626A1 (en) * | 1998-10-29 | 2005-09-08 | Medtronic Minimed Inc. | Fluid reservoir for use with an external infusion device |
US20080076970A1 (en) * | 2006-09-26 | 2008-03-27 | Mike Foulis | Fluid management measurement module |
US20080108896A1 (en) * | 2004-10-13 | 2008-05-08 | Mallinckrodt Inc. | Powerhead of a Power Injection System |
US20090153058A1 (en) * | 2007-12-18 | 2009-06-18 | Hospira, Inc. | Infusion pump with configurable screen settings |
US20130158469A1 (en) * | 2002-05-24 | 2013-06-20 | Baxter Healthcare S.A. | Dialysis machine with electrical insulation for variable voltage input |
US20150133861A1 (en) * | 2013-11-11 | 2015-05-14 | Kevin P. McLennan | Thermal management system and method for medical devices |
US10022498B2 (en) | 2011-12-16 | 2018-07-17 | Icu Medical, Inc. | System for monitoring and delivering medication to a patient and method of using the same to minimize the risks associated with automated therapy |
WO2018215542A1 (en) | 2017-05-23 | 2018-11-29 | B. Braun Melsungen Ag | Sterile pump module for an infusion pump |
US10143795B2 (en) | 2014-08-18 | 2018-12-04 | Icu Medical, Inc. | Intravenous pole integrated power, control, and communication system and method for an infusion pump |
US10166328B2 (en) | 2013-05-29 | 2019-01-01 | Icu Medical, Inc. | Infusion system which utilizes one or more sensors and additional information to make an air determination regarding the infusion system |
US10342917B2 (en) | 2014-02-28 | 2019-07-09 | Icu Medical, Inc. | Infusion system and method which utilizes dual wavelength optical air-in-line detection |
US10430761B2 (en) | 2011-08-19 | 2019-10-01 | Icu Medical, Inc. | Systems and methods for a graphical interface including a graphical representation of medical data |
US10463788B2 (en) | 2012-07-31 | 2019-11-05 | Icu Medical, Inc. | Patient care system for critical medications |
US10578474B2 (en) | 2012-03-30 | 2020-03-03 | Icu Medical, Inc. | Air detection system and method for detecting air in a pump of an infusion system |
US10596316B2 (en) | 2013-05-29 | 2020-03-24 | Icu Medical, Inc. | Infusion system and method of use which prevents over-saturation of an analog-to-digital converter |
US10635784B2 (en) | 2007-12-18 | 2020-04-28 | Icu Medical, Inc. | User interface improvements for medical devices |
US10656894B2 (en) | 2017-12-27 | 2020-05-19 | Icu Medical, Inc. | Synchronized display of screen content on networked devices |
US10850024B2 (en) | 2015-03-02 | 2020-12-01 | Icu Medical, Inc. | Infusion system, device, and method having advanced infusion features |
US10874793B2 (en) | 2013-05-24 | 2020-12-29 | Icu Medical, Inc. | Multi-sensor infusion system for detecting air or an occlusion in the infusion system |
US10918787B2 (en) | 2015-05-26 | 2021-02-16 | Icu Medical, Inc. | Disposable infusion fluid delivery device for programmable large volume drug delivery |
US11135360B1 (en) | 2020-12-07 | 2021-10-05 | Icu Medical, Inc. | Concurrent infusion with common line auto flush |
USD939079S1 (en) | 2019-08-22 | 2021-12-21 | Icu Medical, Inc. | Infusion pump |
US11246985B2 (en) | 2016-05-13 | 2022-02-15 | Icu Medical, Inc. | Infusion pump system and method with common line auto flush |
US11278671B2 (en) | 2019-12-04 | 2022-03-22 | Icu Medical, Inc. | Infusion pump with safety sequence keypad |
US11324888B2 (en) | 2016-06-10 | 2022-05-10 | Icu Medical, Inc. | Acoustic flow sensor for continuous medication flow measurements and feedback control of infusion |
US11344673B2 (en) | 2014-05-29 | 2022-05-31 | Icu Medical, Inc. | Infusion system and pump with configurable closed loop delivery rate catch-up |
US11344668B2 (en) | 2014-12-19 | 2022-05-31 | Icu Medical, Inc. | Infusion system with concurrent TPN/insulin infusion |
US11883361B2 (en) | 2020-07-21 | 2024-01-30 | Icu Medical, Inc. | Fluid transfer devices and methods of use |
US11972395B2 (en) | 2023-02-01 | 2024-04-30 | Icu Medical, Inc. | Systems and methods for a graphical interface including a graphical representation of medical data |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2000262A (en) * | 1931-11-09 | 1935-05-07 | William Joyner | Hypodermic injector |
US2645224A (en) * | 1950-03-18 | 1953-07-14 | Ward L Beebe | Hypodermic syringe |
US3206072A (en) * | 1964-09-22 | 1965-09-14 | Calvin R Mencken | Pipetting machine |
US3443521A (en) * | 1967-01-26 | 1969-05-13 | Carl H Stender | Pumping equipment and operating mechanism |
US3559644A (en) * | 1967-12-14 | 1971-02-02 | Robert F Shaw | Liquid infusion apparatus |
US3731679A (en) * | 1970-10-19 | 1973-05-08 | Sherwood Medical Ind Inc | Infusion system |
US3818806A (en) * | 1971-06-15 | 1974-06-25 | G Fumagalli | Pumping device for promoting patients breathing |
-
1974
- 1974-02-07 US US440410A patent/US3901231A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2000262A (en) * | 1931-11-09 | 1935-05-07 | William Joyner | Hypodermic injector |
US2645224A (en) * | 1950-03-18 | 1953-07-14 | Ward L Beebe | Hypodermic syringe |
US3206072A (en) * | 1964-09-22 | 1965-09-14 | Calvin R Mencken | Pipetting machine |
US3443521A (en) * | 1967-01-26 | 1969-05-13 | Carl H Stender | Pumping equipment and operating mechanism |
US3559644A (en) * | 1967-12-14 | 1971-02-02 | Robert F Shaw | Liquid infusion apparatus |
US3731679A (en) * | 1970-10-19 | 1973-05-08 | Sherwood Medical Ind Inc | Infusion system |
US3818806A (en) * | 1971-06-15 | 1974-06-25 | G Fumagalli | Pumping device for promoting patients breathing |
Cited By (123)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2609699A1 (en) * | 1974-05-28 | 1977-09-15 | Imed Corp | Pump with predetermined flow rate and dispensed volume - has volumetric cassette with piston and piston delivery stroke control |
US3985133A (en) * | 1974-05-28 | 1976-10-12 | Imed Corporation | IV pump |
US4056333A (en) * | 1974-07-15 | 1977-11-01 | Valleylab | Intravenous feeding pump failure alarm system |
US4067332A (en) * | 1975-02-28 | 1978-01-10 | Ivac Corporation | Syringe pump drive system and disposable syringe cartridge |
US3999542A (en) * | 1975-04-10 | 1976-12-28 | Shaw Robert F | Anti-clogging liquid administration apparatus and method |
US4126132A (en) * | 1975-07-28 | 1978-11-21 | Andros Incorporated | Intravenous and intra arterial delivery system |
US4091810A (en) * | 1975-11-03 | 1978-05-30 | Valleylab | Method for intravenous feeding of a patient |
US4178927A (en) * | 1975-11-03 | 1979-12-18 | Valleylab | Intravenous liquid delivery system |
DE2660392C2 (en) * | 1976-03-06 | 1983-10-20 | Imed Corp., 92131 San Diego, Calif. | Piston pump arrangement for an infusion apparatus |
US4468222A (en) * | 1976-05-24 | 1984-08-28 | Valleylab | Intravenous liquid pumping system and method |
US4078562A (en) * | 1976-08-16 | 1978-03-14 | Diana W. Friedman | Infusion pump with feedback control |
US4175474A (en) * | 1976-12-13 | 1979-11-27 | Elitex, Koncern Textilniho Strojirenstvi | Variable displacement pump |
US4264281A (en) * | 1978-05-11 | 1981-04-28 | Paul Hammelmann | Pump with an automatically adjusted output rate |
US4392847A (en) * | 1979-01-08 | 1983-07-12 | Whitney Douglass G | Injection and monitoring system |
US4391599A (en) * | 1979-01-18 | 1983-07-05 | Imed Corporation | Apparatus for providing a controlled flow of intravenous fluid to a patient |
US4410322A (en) * | 1979-03-09 | 1983-10-18 | Avi, Inc. | Nonpulsating TV pump and disposable pump chamber |
US4391600A (en) * | 1979-03-09 | 1983-07-05 | Avi, Inc. | Nonpulsating IV pump and disposable pump chamber |
US4382753A (en) * | 1979-03-09 | 1983-05-10 | Avi, Inc. | Nonpulsating IV pump and disposable pump chamber |
WO1982000590A1 (en) * | 1980-08-25 | 1982-03-04 | Travenol Lab Baxter | Metering apparatus with downline pressure monitoring system |
US4394862A (en) * | 1980-08-25 | 1983-07-26 | Baxter Travenol Laboratories, Inc. | Metering apparatus with downline pressure monitoring system |
US4381006A (en) * | 1980-11-10 | 1983-04-26 | Abbott Laboratories | Continuous low flow rate fluid dispenser |
US4452251A (en) * | 1982-11-05 | 1984-06-05 | Medrad, Inc. | Syringe content indicating device |
USRE36871E (en) * | 1984-02-08 | 2000-09-12 | Abbott Laboratories | Remotely programmable infusion system |
US4696671A (en) * | 1984-02-08 | 1987-09-29 | Omni-Flow, Inc. | Infusion system having plural fluid input ports and at least one patient output port |
US5464392A (en) * | 1984-02-08 | 1995-11-07 | Abbott Laboratories | Infusion system having plural fluid input ports and at least one patient output port |
US4828545A (en) * | 1984-02-08 | 1989-05-09 | Omni-Flow, Inc. | Pressure responsive multiple input infusion system |
US5304126A (en) * | 1984-02-08 | 1994-04-19 | Abbott Laboratories | Infusion system having plural fluid flow lines |
US5100380A (en) * | 1984-02-08 | 1992-03-31 | Abbott Laboratories | Remotely programmable infusion system |
US4674722A (en) * | 1985-11-18 | 1987-06-23 | Critikon, Inc. | Medical accessory pole clamp |
US4854836A (en) * | 1986-02-18 | 1989-08-08 | Baxter International Inc. | Collapsible conduit for linear peristaltic pump and method of making the same |
US4816019A (en) * | 1986-03-04 | 1989-03-28 | Kamen Dean L | Infiltration detection system using pressure measurement |
US4857048A (en) * | 1987-05-29 | 1989-08-15 | Hewlett-Packard Company | IV pump and disposable flow chamber with flow control |
US4898579A (en) * | 1987-06-26 | 1990-02-06 | Pump Controller Corporation | Infusion pump |
US4838860A (en) * | 1987-06-26 | 1989-06-13 | Pump Controller Corporation | Infusion pump |
US5584667A (en) * | 1988-05-17 | 1996-12-17 | Davis; David L. | Method of providing uniform flow from an infusion device |
US6742992B2 (en) | 1988-05-17 | 2004-06-01 | I-Flow Corporation | Infusion device with disposable elements |
US6312227B1 (en) | 1988-05-17 | 2001-11-06 | I-Flow Corp. | Infusion device with disposable elements |
US5320503A (en) * | 1988-05-17 | 1994-06-14 | Patient Solutions Inc. | Infusion device with disposable elements |
US5803712A (en) * | 1988-05-17 | 1998-09-08 | Patient Solutions, Inc. | Method of measuring an occlusion in an infusion device with disposable elements |
US6146109A (en) * | 1988-05-17 | 2000-11-14 | Alaris Medical Systems, Inc. | Infusion device with disposable elements |
GB2252798B (en) * | 1991-02-14 | 1994-07-27 | Danby Medical Ltd | Pumping apparatus |
GB2252798A (en) * | 1991-02-14 | 1992-08-19 | Danby Medical Ltd | Pumping arrangment for intravenous supply of fluids |
US5199852A (en) * | 1991-02-14 | 1993-04-06 | Danby Medical Limited | Pumping arrangement for intravenous supply of fluids |
US5580347A (en) * | 1991-07-31 | 1996-12-03 | Mentor Ophthalmics, Inc. | Controlling operation of handpieces during ophthalmic surgery |
WO1993002627A1 (en) * | 1991-07-31 | 1993-02-18 | Mentor O&O Inc. | Controlling operation of handpieces during ophthalmic surgery |
US5395320A (en) * | 1992-06-09 | 1995-03-07 | Sabratek Corporation | Programmable infusion pump with interchangeable tubing |
US5342313A (en) * | 1992-11-02 | 1994-08-30 | Infusion Technologies Corporation | Fluid pump for a flexible, variable geometry reservoir |
US5232439A (en) * | 1992-11-02 | 1993-08-03 | Infusion Technologies Corporation | Method for pumping fluid from a flexible, variable geometry reservoir |
US5609575A (en) * | 1994-04-11 | 1997-03-11 | Graseby Medical Limited | Infusion pump and method with dose-rate calculation |
US5462256A (en) * | 1994-05-13 | 1995-10-31 | Abbott Laboratories | Push button flow stop useable with a disposable infusion pumping chamber cassette |
US5816779A (en) * | 1994-05-13 | 1998-10-06 | Abbott Laboratories | Disposable fluid infusion pumping cassette having an interrelated flow control and pressure monitoring arrangement |
US5637093A (en) * | 1995-03-06 | 1997-06-10 | Sabratek Corporation | Infusion pump with selective backlight |
US5795327A (en) * | 1995-03-06 | 1998-08-18 | Sabratek Corporation | Infusion pump with historical data recording |
US5791880A (en) * | 1995-03-06 | 1998-08-11 | Sabratek Corporation | Infusion pump having power-saving modes |
US5904668A (en) * | 1995-03-06 | 1999-05-18 | Sabratek Corporation | Cassette for an infusion pump |
US5766155A (en) * | 1995-03-06 | 1998-06-16 | Sabratek Corporation | Infusion pump with selective backlight |
US5993420A (en) * | 1995-03-06 | 1999-11-30 | Sabratek Corporation | Cassette for an infusion pump |
US5628619A (en) * | 1995-03-06 | 1997-05-13 | Sabratek Corporation | Infusion pump having power-saving modes |
US5620312A (en) * | 1995-03-06 | 1997-04-15 | Sabratek Corporation | Infusion pump with dual-latching mechanism |
US5910110A (en) * | 1995-06-07 | 1999-06-08 | Mentor Ophthalmics, Inc. | Controlling pressure in the eye during surgery |
US5829723A (en) * | 1995-06-28 | 1998-11-03 | Medex, Inc. | Medical device mounting structure |
US5788674A (en) * | 1996-03-05 | 1998-08-04 | Medication Delivery Devices, Inc. | Apparatus and method for limiting free-flow in an infusion system |
US6110153A (en) * | 1996-07-25 | 2000-08-29 | Alaris Medical Systems, Inc. | Infusion device with optical sensor |
US5853386A (en) * | 1996-07-25 | 1998-12-29 | Alaris Medical Systems, Inc. | Infusion device with disposable elements |
US5951510A (en) * | 1997-04-11 | 1999-09-14 | Nestec S.A. | Pump system with error detection for clinical nutrition |
US6468242B1 (en) | 1998-03-06 | 2002-10-22 | Baxter International Inc. | Medical apparatus with patient data recording |
USD418916S (en) * | 1998-09-16 | 2000-01-11 | Mentor Ophthalmics, Inc. | Tube set for surgical instrument |
US20050197626A1 (en) * | 1998-10-29 | 2005-09-08 | Medtronic Minimed Inc. | Fluid reservoir for use with an external infusion device |
US20030069541A1 (en) * | 1999-03-09 | 2003-04-10 | Durect Corporation | Implantable device for access to a treatment site |
WO2002087665A1 (en) * | 2001-04-26 | 2002-11-07 | Groening Ruediger | Pump for the time-controlled, metered administration of medicaments |
WO2003035138A2 (en) * | 2001-10-22 | 2003-05-01 | L.G. Med Ltd. | Method and device for detecting malfunction in a gravity fed intravenous delivery system |
WO2003035138A3 (en) * | 2001-10-22 | 2003-10-30 | L G Med Ltd | Method and device for detecting malfunction in a gravity fed intravenous delivery system |
US6974438B2 (en) * | 2001-10-22 | 2005-12-13 | L.G. Med Ltd. | Method and device for detecting malfunction in a gravity fed intravenous delivery system |
US20130158469A1 (en) * | 2002-05-24 | 2013-06-20 | Baxter Healthcare S.A. | Dialysis machine with electrical insulation for variable voltage input |
US9504778B2 (en) * | 2002-05-24 | 2016-11-29 | Baxter International Inc. | Dialysis machine with electrical insulation for variable voltage input |
US20050159708A1 (en) * | 2002-07-24 | 2005-07-21 | Rudolf Sidler | Infusion pump, control program, semiconductor means and method for the dosed administration of a medicinal liquid |
US20080108896A1 (en) * | 2004-10-13 | 2008-05-08 | Mallinckrodt Inc. | Powerhead of a Power Injection System |
US8180434B2 (en) * | 2004-10-13 | 2012-05-15 | Mallinckrodt Llc | Powerhead of a power injection system |
US20080076970A1 (en) * | 2006-09-26 | 2008-03-27 | Mike Foulis | Fluid management measurement module |
US20090157432A1 (en) * | 2007-12-18 | 2009-06-18 | Hospira, Inc. | Infusion pump with configurable screen settings |
US8543416B2 (en) * | 2007-12-18 | 2013-09-24 | Hospira, Inc. | Infusion pump with configurable screen settings |
US8700421B2 (en) | 2007-12-18 | 2014-04-15 | Hospira, Inc. | Infusion pump with configurable screen settings |
US9381296B2 (en) | 2007-12-18 | 2016-07-05 | Hospira, Inc. | Infusion pump with configurable screen settings |
US9393362B2 (en) | 2007-12-18 | 2016-07-19 | Hospira, Inc. | Infusion pump with configurable screen settings |
US10635784B2 (en) | 2007-12-18 | 2020-04-28 | Icu Medical, Inc. | User interface improvements for medical devices |
US20090153058A1 (en) * | 2007-12-18 | 2009-06-18 | Hospira, Inc. | Infusion pump with configurable screen settings |
US11599854B2 (en) | 2011-08-19 | 2023-03-07 | Icu Medical, Inc. | Systems and methods for a graphical interface including a graphical representation of medical data |
US10430761B2 (en) | 2011-08-19 | 2019-10-01 | Icu Medical, Inc. | Systems and methods for a graphical interface including a graphical representation of medical data |
US11004035B2 (en) | 2011-08-19 | 2021-05-11 | Icu Medical, Inc. | Systems and methods for a graphical interface including a graphical representation of medical data |
US10022498B2 (en) | 2011-12-16 | 2018-07-17 | Icu Medical, Inc. | System for monitoring and delivering medication to a patient and method of using the same to minimize the risks associated with automated therapy |
US11376361B2 (en) | 2011-12-16 | 2022-07-05 | Icu Medical, Inc. | System for monitoring and delivering medication to a patient and method of using the same to minimize the risks associated with automated therapy |
US10578474B2 (en) | 2012-03-30 | 2020-03-03 | Icu Medical, Inc. | Air detection system and method for detecting air in a pump of an infusion system |
US11933650B2 (en) | 2012-03-30 | 2024-03-19 | Icu Medical, Inc. | Air detection system and method for detecting air in a pump of an infusion system |
US10463788B2 (en) | 2012-07-31 | 2019-11-05 | Icu Medical, Inc. | Patient care system for critical medications |
US11623042B2 (en) | 2012-07-31 | 2023-04-11 | Icu Medical, Inc. | Patient care system for critical medications |
US10874793B2 (en) | 2013-05-24 | 2020-12-29 | Icu Medical, Inc. | Multi-sensor infusion system for detecting air or an occlusion in the infusion system |
US11433177B2 (en) | 2013-05-29 | 2022-09-06 | Icu Medical, Inc. | Infusion system which utilizes one or more sensors and additional information to make an air determination regarding the infusion system |
US10166328B2 (en) | 2013-05-29 | 2019-01-01 | Icu Medical, Inc. | Infusion system which utilizes one or more sensors and additional information to make an air determination regarding the infusion system |
US10596316B2 (en) | 2013-05-29 | 2020-03-24 | Icu Medical, Inc. | Infusion system and method of use which prevents over-saturation of an analog-to-digital converter |
US11596737B2 (en) | 2013-05-29 | 2023-03-07 | Icu Medical, Inc. | Infusion system and method of use which prevents over-saturation of an analog-to-digital converter |
US11213619B2 (en) * | 2013-11-11 | 2022-01-04 | Icu Medical, Inc. | Thermal management system and method for medical devices |
US20150133861A1 (en) * | 2013-11-11 | 2015-05-14 | Kevin P. McLennan | Thermal management system and method for medical devices |
US20220362457A1 (en) * | 2013-11-11 | 2022-11-17 | Icu Medical, Inc. | Thermal management system and method for medical devices |
US10034975B2 (en) | 2013-11-11 | 2018-07-31 | Icu Medical, Inc. | Thermal management system and method for medical devices |
US10342917B2 (en) | 2014-02-28 | 2019-07-09 | Icu Medical, Inc. | Infusion system and method which utilizes dual wavelength optical air-in-line detection |
US11344673B2 (en) | 2014-05-29 | 2022-05-31 | Icu Medical, Inc. | Infusion system and pump with configurable closed loop delivery rate catch-up |
US10143795B2 (en) | 2014-08-18 | 2018-12-04 | Icu Medical, Inc. | Intravenous pole integrated power, control, and communication system and method for an infusion pump |
US11344668B2 (en) | 2014-12-19 | 2022-05-31 | Icu Medical, Inc. | Infusion system with concurrent TPN/insulin infusion |
US10850024B2 (en) | 2015-03-02 | 2020-12-01 | Icu Medical, Inc. | Infusion system, device, and method having advanced infusion features |
US11660386B2 (en) | 2015-05-26 | 2023-05-30 | Icu Medical, Inc. | Disposable infusion fluid delivery device for programmable large volume drug delivery |
US10918787B2 (en) | 2015-05-26 | 2021-02-16 | Icu Medical, Inc. | Disposable infusion fluid delivery device for programmable large volume drug delivery |
US11246985B2 (en) | 2016-05-13 | 2022-02-15 | Icu Medical, Inc. | Infusion pump system and method with common line auto flush |
US11324888B2 (en) | 2016-06-10 | 2022-05-10 | Icu Medical, Inc. | Acoustic flow sensor for continuous medication flow measurements and feedback control of infusion |
WO2018215542A1 (en) | 2017-05-23 | 2018-11-29 | B. Braun Melsungen Ag | Sterile pump module for an infusion pump |
US11395876B2 (en) | 2017-05-23 | 2022-07-26 | B. Braun Melsungen Ag | Sterile pump module for an infusion pump |
US11868161B2 (en) | 2017-12-27 | 2024-01-09 | Icu Medical, Inc. | Synchronized display of screen content on networked devices |
US11029911B2 (en) | 2017-12-27 | 2021-06-08 | Icu Medical, Inc. | Synchronized display of screen content on networked devices |
US10656894B2 (en) | 2017-12-27 | 2020-05-19 | Icu Medical, Inc. | Synchronized display of screen content on networked devices |
USD939079S1 (en) | 2019-08-22 | 2021-12-21 | Icu Medical, Inc. | Infusion pump |
US11278671B2 (en) | 2019-12-04 | 2022-03-22 | Icu Medical, Inc. | Infusion pump with safety sequence keypad |
US11883361B2 (en) | 2020-07-21 | 2024-01-30 | Icu Medical, Inc. | Fluid transfer devices and methods of use |
US11135360B1 (en) | 2020-12-07 | 2021-10-05 | Icu Medical, Inc. | Concurrent infusion with common line auto flush |
US11972395B2 (en) | 2023-02-01 | 2024-04-30 | Icu Medical, Inc. | Systems and methods for a graphical interface including a graphical representation of medical data |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3901231A (en) | Infusion pump apparatus | |
US4394862A (en) | Metering apparatus with downline pressure monitoring system | |
US4468222A (en) | Intravenous liquid pumping system and method | |
US4670006A (en) | Fluid and air infusion device | |
US4261388A (en) | Drop rate controller | |
US3425415A (en) | Controlled infusion system | |
US4642098A (en) | IV system and controller and combination IV filter and pump assembly for use therein and method | |
CA2176473C (en) | A syringe infusion pump having a syringe plunger sensor | |
US3731679A (en) | Infusion system | |
US4236880A (en) | Nonpulsating IV pump and disposable pump chamber | |
US5411482A (en) | Valve system and method for control of an infusion pump | |
US3557789A (en) | Therapeutic fluid flow control apparatus | |
US3994294A (en) | Syringe pump valving and motor direction control system | |
US4382753A (en) | Nonpulsating IV pump and disposable pump chamber | |
US3575161A (en) | Valve for biological systems | |
JPS62176457A (en) | Vein dripping apparatus | |
EP0063727A2 (en) | Fluid pump | |
US2065952A (en) | Adjustable support | |
GB2106993A (en) | Apparatus for enteral administration of nutriment | |
US3456648A (en) | Automatic venous infusion monitoring apparatus | |
GB1165842A (en) | Improvements in and relating to Injection Appliances for Contrast Agents for Medical Use | |
WO1982001320A1 (en) | Metering apparatus having rate compensation circuit | |
US3757776A (en) | Ventilator for an anesthesia gas machine | |
US4705462A (en) | Process and device for improving working of liquid pumps | |
US4082090A (en) | Mechanical cardiac resuscitator |