WO1996040331A1 - Systeme permettant de chauffer un fluide avant qu'il ne soit administre a un patient - Google Patents

Systeme permettant de chauffer un fluide avant qu'il ne soit administre a un patient Download PDF

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Publication number
WO1996040331A1
WO1996040331A1 PCT/US1996/009681 US9609681W WO9640331A1 WO 1996040331 A1 WO1996040331 A1 WO 1996040331A1 US 9609681 W US9609681 W US 9609681W WO 9640331 A1 WO9640331 A1 WO 9640331A1
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WO
WIPO (PCT)
Prior art keywords
fluid
flow
ofthe
temperature
heating
Prior art date
Application number
PCT/US1996/009681
Other languages
English (en)
Inventor
Michale J. Magliochetti
Carolyn Pals
Original Assignee
Urosurge, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US08/487,852 external-priority patent/US5729653A/en
Application filed by Urosurge, Inc. filed Critical Urosurge, Inc.
Priority to EP96921421A priority Critical patent/EP0831948A1/fr
Priority to JP9501948A priority patent/JPH11507265A/ja
Priority to AU62650/96A priority patent/AU6265096A/en
Publication of WO1996040331A1 publication Critical patent/WO1996040331A1/fr

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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
    • A61M5/44—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 having means for cooling or heating the devices or media
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/36—General characteristics of the apparatus related to heating or cooling
    • A61M2205/3653—General characteristics of the apparatus related to heating or cooling by Joule effect, i.e. electric resistance

Definitions

  • the field of this invention concerns heating fluids and, in particular, heating fluids for delivery to a patient.
  • a bag or a conduit containing a fluid to be warmed may be placed inside an enclosure. Heating plates contained inside the enclosure may be pressed or clamped against the fluid container. Electrical current is supplied to the heating plates, such that the plates warm the fluid container. When the desired heating is accomplished, the fluid container may be released or removed from the enclosure, and the warmed fluid may be delivered to the body.
  • Such devices can be cumbersome and awkward, however, because they require that an operator place the fluid container inside the enclosure, clamp or press the heating plates against the fluid container, and subsequently remove the fluid container before the fluid may be delivered to the body.
  • the temperature monitoring of such devices may be limited, because they typically only measure the temperature ofthe fluid containers and/or heating elements.
  • heating wires may be wrapped around or inside the walls of tubes or hoses.
  • Such techniques may require lengthy warm-up times and/or lengthy heating tubes to achieve desired changes in fluid temperature, however, because wrapped heating wires may not provide efficient heat transfer.
  • the temperature monitoring of such devices may be limited because they typically measure the temperature ofthe heating hose.
  • Devices and methods are disclosed for heating a fluid to normothermic temperatures prior to the delivery ofthe fluid to a patient.
  • the present invention is based on the recognition that an electrically resistive heating element can be molded into a flow- through structure, and this structure can be inserted in a flow-line for warming fluids to normothermic temperatures prior to the delivery of such fluids to a body.
  • the term "normothermic temperatures”, as used herein, encompasses equilibrium body temperatures in the range of about 34 °C to 45 °C.
  • a fluid to be warmed prior to delivery to a patient can be passed through a polymeric flow-through structure disposed in the delivery fluid flow line.
  • An electrically resistive heating element for heating the fluid is molded into the flow-through structure.
  • a temperature monitoring element such as a thermistor, can be used to monitor the temperature ofthe fluid.
  • the thermistor probe can be inserted directly into the fluid stream exiting the flow-through structure to measure the outlet fluid temperature.
  • the flow-through structure can consist of a chamber.
  • the chamber can further consist of a disposable shell.
  • the heating element can be inserted into a center wall in the chamber such that fluid can flow on both sides ofthe heating element for maximum heating efficiency.
  • the heating element can be inserted into one or both ofthe chamber side walls.
  • the chamber can contain baffles for providing a restricted labyrinth flow path for optimizing heating uniformity (e.g., by creating a turbulent flow stream).
  • the chamber can provide a completely unrestricted flow path or can contain baffles for providing an unrestricted labyrinth flow path.
  • the flow-through structure can consist of flow-through tubing.
  • the tubing can further be disposable.
  • the heating element can be disposed along the outer side ofthe wall ofthe tube; in the center ofthe tubular wall; or along the inner fluid-side ofthe wall ofthe tube.
  • the flow-through structure can have a capacity for a fluid flow ranging from about 10 ml/min to about 1000 ml/min.
  • the fluid can flow by gravity or mechanical means into the flow-through structure.
  • a biocompatible protective layer can be disposed between the heating element and the fluid.
  • a flexible insulating material can also be disposed to surround a portion ofthe heating element or the flow-through structure to reduce heat losses. Flexible tubing can be used to deliver the fluid to and from the flow-through structure for increased ease and flexibility.
  • the electrically resistive heating element can include, but is not limited to, an etched metal foil, a carbon dispersion resistor or a dye-cut resistor.
  • the heating element can have a capacity of at least about 50 Watts. In one embodiment ofthe invention, the heating element can heat the fluid a maximum of about 50 ° C above the fluid's storage temperature.
  • a system including a polymeric flow- through structure and an electrically resistive heating element, and further including an external controller can be used to warm a fluid prior to delivery to a patient.
  • the controller can control the power supplied to the heating element through an electrical connection element having pads or other electrical connections disposed on the flow-through structure.
  • the system can also include an attachment mechanism for attaching the controller to the flow-through structure to receive this electrical connection element.
  • the system can include a mounting mechanism for mounting the controller to a support pole.
  • the flow- through structure can consist of a chamber or a tube.
  • the temperature ofthe fluid can be monitored during operation of the system.
  • a temperature sensor can be deployed in the fluid flow path.
  • the temperature ofthe heating element can be monitored.
  • the electrical resistance ofthe heating circuit can be monitored and used to calculate indirectly the temperature ofthe heating element and, hence, the fluid.
  • the temperature monitoring element and/or the resistance sensor can be integrated into the flow-through structure, but physically separate from the heating element. Alternatively, the temperature monitoring element and/or the resistance sensor can be integrated onto the controller.
  • the system can be equipped with a number of operational safety and control features to provide for safe and easy operation ofthe invention.
  • the system can have a power shut-off circuit loop for automatically shutting off power and/or an alarm for sounding when a fault condition occurs.
  • Fault conditions can include the outlet temperature ofthe fluid, the resistance ofthe heating element and/or the fluid resistance exceeding a pre ⁇ determined limit.
  • additional temperature monitoring and control can be accomplished with an infrared temperature sensor disposed on the controller which senses outlet fluid temperature through a window on the structure outlet or elsewhere in the fluid line.
  • the system can also be equipped with a LED two-digital display ofthe outlet fluid temperature for easy visual temperature monitoring.
  • the system can be equipped with one or more lights for indicating whether the desired pre-determined outlet fluid temperature has been reached.
  • the present invention represents a valuable addition to the art of biological fluid warming, and in particular, the art of irrigation fluid warming.
  • FIG. 1 A is a schematic illustration ofthe flow-through structure ofthe present invention wherein the flow-through structure includes a chamber disposed in a gravity-fed fluid delivery line;
  • FIG. IB is a schematic illustration ofthe chamber flow-through structure of the present invention disposed in a mechanically-fed fluid delivery line;
  • FIG. 2 A is a cross-sectional, top view of a disk-shaped chamber flow-through structure
  • FIG. 2B is a cross-sectional, side view of a chamber flow-through structure showing the heating element disposed on a side wall ofthe structure;
  • FIG. 3 is a cross-sectional side, view of a chamber flow-through structure with a heating element disposed on the center wall ofthe structure;
  • FIG. 4 is a cross-sectional, top view of a disk-shaped chamber flow-through structure with horizontal baffles for an unrestricted labyrinth flow path;
  • FIG. 5 is a cross-sectional, top view of a rectangular chamber flow-through structure with slanted baffles for a restricted labyrinth flow path;
  • FIG. 6 shows an etched metal foil resistor for use as a heating element in accordance with the invention;
  • FIG. 7 shows a carbon dispersion resistor for use as a heating element in accordance with the invention
  • FIG. 8 shows a dye-cut resistor for use as a heating element in accordance with the invention
  • FIG. 9 A is a perspective view ofthe system ofthe present invention including a chamber flow-through structure mounted on a vertical support pole;
  • FIG. 9B is a front view of a controller capable of attachment to a chamber flow-through structure ofthe system ofthe present invention.
  • FIG. 9C is a back view ofthe controller of FIG. 9B;
  • FIG. 10 is a schematic diagram showing the internal circuit loop for the system ofthe present invention including a chamber flow-through structure for monitoring and controlling temperature and power equipped with an infrared temperature sensor;
  • FIG. 11 is a schematic illustration of another flow-through structure ofthe present invention wherein the structure includes a tube disposed in a gravity-fed fluid delivery line;
  • FIG. 12A is a more detailed view ofthe tubular flow-through structure of FIG. i i;
  • FIG. 12B is a cross-sectional view of yet another tubular flow-through of FIG. 11:
  • FIG. 13 is a cross-sectional view of yet another tubular flow-through structure ofthe present invention showing a heating element disposed in the center ofthe wall ofthe tubular flow-through structure;
  • FIG. 14A is a perspective view of a system ofthe present invention including a tubular flow-through structure mounted on a vertical support pole;
  • FIG. 14B is a front view ofthe controller ofthe system with the tubular flow- through structure shown in FIG. 14A;
  • FIG. 14C is a back view ofthe controller of FIG. 14 A.
  • FIG. 15 is a schematic diagram showing the internal circuit loop for the system ofthe present invention including a tubular flow-through structure for monitoring and controlling temperature and power equipped with an infrared temperature sensor.
  • FIG. 1 A illustrates a perspective view ofthe device 10 ofthe present invention having a flow-through structure 6 consisting of a chamber 12 disposed in association with a source of fluid 8 and a fluid delivery line consisting of two IV bag spikes 14, a Y connector 16, a gravity-fed fluid line 18 entering the chamber 12, a fluid line 20 exiting the chamber, and a luer connector 22 for connecting the fluid line 20 to a device such as irrigator or IV line for delivering the fluid 8 into a patient.
  • the fluid entering the device ofthe present invention can be delivered by mechanical means 24, as shown in FIG. IB.
  • FIG. 2A illustrates an inside frontal view of a chamber flow-through structure 12 having an electrically resistive heating element 26, an inlet port 28 and an outlet port 30.
  • the fluid inlet port 28 directs the fluid to the bottom ofthe chamber flow-through structure 12 and the fluid outlet port 30 allows the fluid to exit from the top ofthe flow-through structure to facilitate air escape during priming ofthe chamber.
  • FIG. 2B which is an inside side view ofthe chamber flow-through structure 12, shows the electrically resistive heating element 26 disposed on a side wall 32 ofthe chamber flow-through structure 12 such that the fluid flows along one side of this element 26.
  • a temperature monitoring element 34 such as a thermistor or a thermocouple, can be used to monitor the temperature ofthe fluid 20 exiting outlet port 30.
  • a probe 36 ofthe temperature monitoring element 34 can be inserted directly into the fluid line 20 exiting the chamber flow-through structure 12 to measure the outlet fluid temperature.
  • a resistance sensor 38 can be integrated into the chamber flow-through structure 12 but physically separate from the heating element to measure the fluid temperature.
  • a liquid detection sensor 11 can also be employed to measure the resistance of the fluid in the chamber flow-through structure.
  • the chamber flow-through structure 12 can consist of a disposable shell with a capacity for a fluid flow ranging from about 10 ml/min to about 1000 ml/min.
  • the chamber flow-through structure 12 can be manufactured through any number of known , such as injection molding with any FDA approved medical grade thermoplastic (e.g. polypropylene, polyethylene, nylon or PVC).
  • the chamber flow-through structure can also be made of different shapes, and the rectangular and disk shapes shown in Figs. 1 A and 2 A, respectively, are illustrated for exemplary purposes only.
  • FIG. 2A shows the heating element 26 inserted into a chamber sidewall 32
  • the heating element 26 can also be inserted into either (or both) ofthe chamber side walls 32 and 40.
  • FIG. 3 shows that the heating element 26 can be inserted into a center wall 42 ofthe chamber flow-through structure 12 such that fluid can flow on both sides ofthe heating element 26 for maximum heating efficiency.
  • the heating element 26 can be contained between two layers 48 of a laminate material, such as polyimides or polyesters, that will have thermal properties such that they will not melt or otherwise degrade at the temperature of heater operation.
  • FIG. 3 illustrates that a biocompatible protective layer 44, which does not further hinder the heat transfer to the fluid, can be disposed between at least one portion ofthe heating element and the fluid.
  • this layer can be made of any biocompatible material with high thermal conductivity (e.g. polypropylene, polyethylene, nylon or PVC).
  • This layer can be applied to the heating element by a plasma coating process.
  • FIG. 3 also illustrates that an insulating material 46 can be disposed to surround at least a portion ofthe outer surface ofthe heating element 26 or the chamber flow-through structure to reduce heat losses.
  • FIG. 4 shows that horizontal baffles 50 may be inserted into the chamber flow- through structure 12 to form an unrestricted labyrinth flow path 52.
  • the unrestricted labyrinth flow path 52 does not allow the fluid to flow straight through the chamber flow- through structure 12. but at the same time, does not restrict the flow to a single defined flow path.
  • Gaps 54 between the baffles and the chamber walls eliminate fluid dead spots or eddies that would normally occur when the flowing fluid is forced around a corner.
  • FIG. 5 shows the chamber flow-through structure 12 with slanted baffles 56 forming a restricted labyrinth flow path 5.8.
  • slanted baffles 56 force the fluid to flow in a defined labyrinth path.
  • the gaps 60 between the slanted baffles 56 and the walls of the chamber flow-through structure eliminate the fluid dead spots or eddies that normally occur when flowing fluid is forced around a corner.
  • the slanted baffles 56 facilitate the escape of air during the priming process.
  • the electrically resistive heating element 26 is made up of a conductor which heats up in response to an applied electric current.
  • This heating element 26 can include, but is not limited, to an etched metal foil 62, as shown in FIG. 6, a carbon dispersion resistor 64, as shown in FIG. 7, or a dye-cut resistor 66, as shown in FIG. 8.
  • Different heating element shapes also can be used depending upon the shape and/or form ofthe flow-through structure.
  • the heating element can have a capacity of at least about 50 Watts. This power requirement can be accomplished with a variety of resistance/voltage/current configurations.
  • the area of the heating element can be about 15 cm ⁇ to about 600 cm ⁇ . In one embodiment ofthe invention, the heating element can heat the fluid a maximum of about 50 °C above the storage temperature ofthe fluid.
  • FIG. 9 A shows an outside view of this system 70 wherein the system 70 includes a chamber flow-through structure 12 attached to the controller 72, which, in turn, is mounted to a vertical support pole with a mounting mechanism 74.
  • the controller 72 can monitor the temperature ofthe outlet fluid and control the power supply to the heating element through an electrical connection element 76 having pads 78A, 78B, & 78C disposed on the front ofthe controller, shown in FIG. 9B, and pads 80A, 80B, & 80C disposed on the back ofthe chamber flow-through structure, as shown in FIG. 9C.
  • FIG. 9B further illustrates that the front ofthe controller 72 can be equipped with a LED two-digital display 84 ofthe outlet fluid temperature for easy visual temperature monitoring.
  • the front of the controller 72 can be equipped with one or more lights 86 for indicating a fault condition and or whether the desired pre-determined outlet fluid temperature has been reached, a power ON/OFF switch 88 and a RESET switch 89 for easy operator access.
  • the controller 72 can be AC line powered and switchable to operate at either 110 Vac or 220 Vac line voltage.
  • the AC input power can be overload protected by dual (two line) fuses.
  • FIG. 10 An internal circuit loop 90 for controlling temperature of and power to a chamber flow-through structure is shown in FIG. 10.
  • the controller 72 supplies power from the power module 92 via electrical line 94 through electrical connection pads 80B and 78B to the heating element 26.
  • the resistance of heating element 26 can be monitored via line 96 through electrical connection pads 80A and 78A by a resistance sensor 38 which can be disposed on the controller 72.
  • a resistance sensor 38A (shown in dotted lines in FIG. 10) can be located on the chamber flow-through structure 12.
  • the electrical resistance ofthe heating element 26 itself can be used to measure the temperature ofthe heating element and correlated to fluid temperature. Using this method, an upper limit on the resistance ofthe heating element 26 can be used as an over temperature sensor for the fluid.
  • the probe 36 ofthe temperature monitoring element 34 can be disposed in the outlet port 30 to monitor the temperature ofthe fluid 20 exiting the chamber flow-through structure 12. This information is transmitted back to the power module 92 via line 98 through electrical connection pads 80C and 78C.
  • the temperature monitoring element 34A (shown in dotted lines in FIG. 10) can be disposed on the controller and its probe 36A can be inserted into a sleeve 37 or other portion ofthe outlet port 30 of the chamber flow-through structure 12. This information can be transmitted back to the power module 92 via line 98 A.
  • the actual temperature ofthe fluid can then be relayed via line 100 to the temperature display panel 102 and/or relayed via line 104 to at least one light 86A indicating whether the temperature has reached the desired level.
  • Additional temperature monitoring and control can be accomplished with an infrared temperature sensor 108 disposed on the controller 72 which senses outlet fluid temperature through a window 110 on the chamber flow-through structure outlet port 30 or elsewhere in the fluid line. This information can be relayed to the power module 92 via line 112 and also used for the temperature monitoring.
  • a liquid detection sensor 11 can be employed to measure the resistance ofthe fluid in the tube. If sensor 11 detects a lack of fluid (e.g., a high resistance) a shut-off signal can be relayed via line 136 and electrical connection pads 132 D and 134 D to the power module 92.
  • the power ON/OFF switch 88 can be relayed to the power module 92 via line 114.
  • the RESET switch 89 can be relayed to the power module 92 via line 116.
  • the power module 92 can automatically shut off power to the heating element 26.
  • the power module can sound an alarm 1 18 via line 120 and or illuminate a warning light 86B via line 122 to warn the user of a fault condition.
  • FIG. 11 illustrates a perspective view of another embodiment ofthe invention including a device 140 ofthe present invention having a flow-through structure 138 consisting of a tube 142 disposed in association with a source of fluid 8 and a fluid delivery line consisting of two IV bag spikes 14, a Y connector 16, a gravity-fed fluid line 18 entering the tube 142, a fluid line 20 exiting the tube, and a luer connector 22 for connecting the fluid line 20 to a device such as irrigator or IV line for delivering the fluid 8 into a patient.
  • the fluid entering the device 140 can be delivered by mechanical means.
  • the tube 142 can consist of a disposable tubing with a capacity for a fluid flow ranging from about 10 ml/min to about 1000 ml/min.
  • the tube 142 can be manufactured through any number of known continuous or batch methodologies, such as extrusion processes with any FDA approved medical grade thermoplastic (e.g., silicone, polyurethane or PVC).
  • the tube 142 can be various lengths (e.g., from about 6 inches to several feet).
  • FIG. 12A illustrates an inside view of a tubular flow-through structure 142 having an electrically resistive heating element 144, an inlet port 146 and an outlet port 148.
  • a temperature monitoring element 150 such as a thermistor or a thermocouple, can be used to monitor the temperature ofthe fluid 20 exiting outlet port 148.
  • a probe 152 ofthe temperature monitoring element 150 can be inserted directly into the fluid line 20 at outlet port 148 to measure the outlet fluid temperature.
  • a sensor 158 can be integrated into the tubular flow-through structure 142 but physically separate from the heating element to measure the resistance ofthe heating element which can then be correlated to the fluid temperature.
  • a liquid detection sensor 160 can also be employed to measure the resistance of the fluid in the tube.
  • FIG. 12B which is an inside side view ofthe tubular flow-through structure 142, shows the electrically resistive heating element 144 disposed on an inner side 162 ofthe wall ofthe tubular flow-through structure 142.
  • the heating element 144 can also be inserted into the outer side 164 ofthe wall ofthe tubular flow-through structure 142.
  • FIG. 13 shows that the heating element 144 can be inserted into the center 166 of the wall ofthe tubular flow-through structure 142.
  • the heating element 144 can be contained between two layers 168 of a laminate material, such as polyimides or polyesters, that will have thermal properties such that they will not melt or otherwise degrade at the temperature of heater operation.
  • FIG. 12B which is an inside side view ofthe tubular flow-through structure 142, shows the electrically resistive heating element 144 disposed on an inner side 162 ofthe wall ofthe tubular flow-through structure 142.
  • the heating element 144 can also be inserted into the outer side 164 ofthe wall ofthe tubular flow-
  • FIG. 13 illustrates that a biocompatible protective layer 170, which does not further hinder the heat transfer to the fluid, can be disposed between at least one portion ofthe heating element and the fluid.
  • this layer can be made of any of a variety of known biocompatible materials (e.g., polypropylene, polyethylene, nylon or PVC).
  • This layer can be applied to the heating element by a plasma coating process.
  • FIG. 13 also illustrates that an insulating material 172 can be disposed to surround at least a portion ofthe outer surface ofthe heating element 144 or the tubular flow-through structure 142 to reduce heat losses.
  • the present invention also provides a system including a polymeric flow- through structure consisting of a tube, an electrically resistive heating element coupled to the tube, and an external controller for heating fluids prior to delivery to a patient.
  • FIG. 14A shows an outside view of this system 180 with the tubular flow-through structure 142 attached to the controller 182, which, in turn, is mounted to a vertical support pole with a mounting mechanism 184.
  • the controller 182 can monitor the temperature ofthe outlet fluid and can control the power supply to the heating element through an electrical connection element 186 having pads 188 A, 188 B, & 188 C disposed on the front ofthe controller, shown in FIG.
  • FIG. 14B and pads 190 A, 190 B, & 190 C disposed on the back ofthe tubular flow-through structure, as shown in FIG. 14C.
  • other electrical connections such as prongs, jacks, plugs or the like can be used. All electrical connections can be safety interlocked to the proper installation ofthe disposable tubular flow-through structure 142.
  • the attachment mechanism 192 for attaching the front ofthe controller 182 to back ofthe tubular flow-through structure 142 to receive this electrical connection element is also shown in Figs. 14B and 14C.
  • FIG. 14B further illustrates that the front ofthe controller 182 can be equipped with a LED two-digital display 191 ofthe outlet fluid temperature for easy visual temperature monitoring.
  • the front ofthe controller 182 can be equipped with one or more lights 194 for indicating a fault condition and/or whether the desired predetermined outlet fluid temperature has been reached, a power ON/OFF switch 196 and a RESET switch 199 for easy operator access.
  • the controller 182 can be AC line powered and switchable to operate at either 110 Vac or 220 Vac line voltage.
  • the AC input power can be overload protected by dual (two line) fuses.
  • FIG. 15 An internal circuit loop 200 for controlling temperature of and power to a tubular flow-through structure 142 is shown in FIG. 15.
  • the controller 182 supplies power from the power module 202 via electrical line 204 through electrical connection pads 188B and 190B to the heating element 144.
  • the resistance of heating element 144 can be monitored via line 206 through electrical connection pads 190A and 188 A by a resistance sensor 158 which can be disposed on the controller 182.
  • a resistance sensor 158A shown in dotted lines in FIG. 16) can be located on the tube 142.
  • the electrical resistance ofthe heating element 144 can be used to measure the temperature ofthe heating element 144, and hence, the temperature ofthe fluid. Using this method, an upper limit on the resistance ofthe heating element 144 can be used as an over temperature sensor.
  • the probe 152 ofthe temperature monitoring element 150 can be disposed in the outlet port 148 to monitor the temperature ofthe fluid 20 exiting the tubular flow-through structure 142. This information is transmitted back to the power module 202 via line 208 through electrical connection pads 190C and 188C.
  • the temperature monitoring element 150A (shown in dotted lines in FIG. 15) can be disposed on the controller and its probe 152 A can be inserted into a sleeve 154 or other portion ofthe outlet port 148 ofthe tubular flow-through structure 142. This information can be transmitted back to the power module 202 via line 208 A.
  • the actual temperature ofthe fluid can then be relayed via line 210 to the temperature display panel 191 and/or relayed via line 214 to at least one light 194A indicating whether the temperature has reached the desired level.
  • Additional temperature monitoring and control can be accomplished with an infrared temperature sensor 218 disposed on the controller 182 which senses outlet fluid temperature through a window 220 on the tube outlet port 148 or elsewhere in the fluid line. This information can be relayed to the power module 202 via line 212 and also used for the temperature monitoring.
  • a liquid detection sensor 160 can be employed to measure the resistance ofthe fluid in the tube.
  • a shut-off signal can be relayed via line 236 and electrical connection pads 232 D and 234 D to the power module 202.
  • the power ON/OFF switch 196 can be relayed to the power module 202 via line 244.
  • the RESET switch 199 can be relayed to the power module 202 via line 216.
  • the power module 202 can automatically shut off power to the heating element 144.
  • the power module can sound an alarm 240 via line 242 and/or illuminate a warning light 194B via line 222 to warn the user of a fault condition.
  • the present invention benefits from the recognition that an electrically resistive heating element can be molded into a flow-through structure, and this structure can be inserted in a flow-line for warming fluids to normothermic temperatures prior to the delivery ofsuch fluids to a body.
  • the devices and methods ofthe present invention have several advantages over the traditional devices and techniques for heating such fluids.
  • the incorporation ofthe heating element inside the polymeric, flow-through structure provides that device can be inserted in one simple step directly in the fluid delivery line.
  • the traditional techniques may require multiple steps such as placing a bag or conduit of fluid inside an enclosure, pressing or clamping heating plates against the fluid container, and subsequently, removing the heating plates prior to fluid delivery.
  • the coupling of an electrically resistive heating element which is highly efficient in terms of heat transfer, to a polymeric, flow-through structure, such as a chamber or a tube, provides that the desired fluid heating can be accomplished quickly with a relatively compact device.
  • the traditional techniques involving wrapping heating wires around hoses may not be efficient in terms of heat transfer, and thus may require long warm-up times and lengthy hoses to accomplish the desired fluid heating.
  • the devices and methods ofthe present invention provide unique and accurate temperature monitoring and control.
  • the device can employ a probe of a temperature monitoring element inserted directly in the flow line ofthe fluid exiting the flow- through structure.
  • the device can employ an infrared sensor for sensing the outlet fluid temperature through window molded in the exit port ofthe flow- through structure.
  • the traditional techniques typically only monitor the temperature ofthe heating plate and/or fluid container.

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  • Health & Medical Sciences (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • External Artificial Organs (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)

Abstract

L'invention concerne des procédés et des dispositifs permettant de chauffer un fluide à une température normothermique avant qu'il ne soit administré à un patient. Dans un mode de réalisation, un fluide à chauffer avant d'être administré à un patient peut passer à travers une structure polymère de circulation, placée dans la conduite de transport du fluide. Un élément de chauffage ohmique destiné à chauffer le fluide peut être moulé dans la structure de circulation pour faire passer le fluide d'une température ambiante ou d'une température ambiante de stockage, à une température normothermique ou à la température corporelle du patient concerné. Une sonde comprenant un élément de surveillance de la température peut être utilisée pour surveiller la température du fluide sortant de la structure de circulation. Dans une variante, cette information peut être transmise à un contrôleur, afin de réguler le courant qui alimente l'élément résistif et, par conséquent, la température du fluide. Dans une autre variante, un palpeur pyrométrique à infrarouges peut être utilisé pour surveiller la température au niveau du fluide sortant de la structure, par balayage à travers une fenêtre située dans l'orifice de sortie de la structure de circulation ou ailleurs dans la conduite de transport de fluide.
PCT/US1996/009681 1995-06-07 1996-06-07 Systeme permettant de chauffer un fluide avant qu'il ne soit administre a un patient WO1996040331A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP96921421A EP0831948A1 (fr) 1995-06-07 1996-06-07 Systeme permettant de chauffer un fluide avant qu'il ne soit administre a un patient
JP9501948A JPH11507265A (ja) 1995-06-07 1996-06-07 流体加熱システム
AU62650/96A AU6265096A (en) 1995-06-07 1996-06-07 Fluid warming system for heating a fluid prior to delivery of the fluid to a patient

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US47648795A 1995-06-07 1995-06-07
US08/487,852 US5729653A (en) 1995-06-07 1995-06-07 Fluid warming system
US08/476,487 1995-06-07
US08/487,852 1995-06-07

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DE19828923A1 (de) * 1998-06-29 2000-01-05 Fresenius Medical Care De Gmbh Heizung zur Erwärmung von medizinischen Flüssigkeiten
WO2000002608A1 (fr) * 1998-07-10 2000-01-20 Belmont Instrument Corporation Rechauffeur portatif pour liquide administre par voie intraveineuse
US9737672B2 (en) 2007-08-07 2017-08-22 Belmont Instrument Corporation Hyperthermia, system, method, and components
US10137257B2 (en) 2016-11-30 2018-11-27 Belmont Instrument, Llc Slack-time heating system for blood and fluid warming
US10485936B2 (en) 2016-11-30 2019-11-26 Belmont Instrument, Llc Rapid infuser with advantageous flow path for blood and fluid warming
US10507292B2 (en) 2016-11-30 2019-12-17 Belmont Instrument, Llc Rapid infuser with vacuum release valve
US11000407B2 (en) 2007-08-07 2021-05-11 Belmont Instrument, Llc Hyperthermia, system, method, and components
US11813194B2 (en) 2017-03-06 2023-11-14 Board Of Regents, The University Of Texas System Water perfusion heat exchange pad for control of skin temperature
US11850396B2 (en) 2019-10-30 2023-12-26 Boston Scientific Scimed, Inc. System and method for monitoring fluid deficit
US11883626B2 (en) 2019-06-27 2024-01-30 Boston Scientific Scimed, Inc. Detection of an endoscope to a fluid management system
US12108985B2 (en) 2020-07-30 2024-10-08 Boston Scientific Scimed, Inc. Fluid management system with integrated laser fiber cooling

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
US10933200B2 (en) * 2015-12-30 2021-03-02 Acist Medical Systems, Inc. Thermal conditioning device for an injection system

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CH198839A (de) * 1937-10-30 1938-07-15 Alois Schuler Vorrichtung zum Einführen von flüssigen Stoffen in den menschlichen oder tierischen Körper.
GB1161366A (en) * 1967-03-03 1969-08-13 Heinz Frank Poppendiek Means and Techniques useful for Changing Temperature of Liquids, particularly Blood
US4038519A (en) * 1973-11-15 1977-07-26 Rhone-Poulenc S.A. Electrically heated flexible tube having temperature measuring probe
FR2505294A1 (fr) * 1981-05-11 1982-11-12 Extracorporeal Med Spec Appareil pour chauffer ou refroidir des fluides et recipient utilisable dans cet appareil
US4847470A (en) * 1987-12-14 1989-07-11 Bakke Allan P Electric blood warmer utilizing metallic ribbon flow cartridge and low thermal mass heating units
DE4030368C1 (fr) * 1990-09-26 1991-11-14 B. Braun Melsungen Ag, 3508 Melsungen, De
US5108372A (en) * 1990-12-12 1992-04-28 Houston Advanced Research Center Intravenous fluid temperature regulation method and apparatus
DE9201792U1 (de) * 1992-02-13 1992-05-21 Burgert, Bertram, 7816 Münstertal Mobil einsetzbarer Infusionserwärmer, insbesondere zum Warmhalten von Infusionslösungen in Flaschen, Plastikbehälter und Plastikbeuteln sowie deren Zuleitungssysteme zum menschlichen Körper
WO1992017040A1 (fr) * 1991-03-15 1992-10-01 In-Touch Products Co. Coffret chauffant pour liquides parenteraux, systeme et methodes
US5211631A (en) * 1991-07-24 1993-05-18 Sheaff Charles M Patient warming apparatus

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Publication number Priority date Publication date Assignee Title
CH198839A (de) * 1937-10-30 1938-07-15 Alois Schuler Vorrichtung zum Einführen von flüssigen Stoffen in den menschlichen oder tierischen Körper.
GB1161366A (en) * 1967-03-03 1969-08-13 Heinz Frank Poppendiek Means and Techniques useful for Changing Temperature of Liquids, particularly Blood
US4038519A (en) * 1973-11-15 1977-07-26 Rhone-Poulenc S.A. Electrically heated flexible tube having temperature measuring probe
FR2505294A1 (fr) * 1981-05-11 1982-11-12 Extracorporeal Med Spec Appareil pour chauffer ou refroidir des fluides et recipient utilisable dans cet appareil
US4847470A (en) * 1987-12-14 1989-07-11 Bakke Allan P Electric blood warmer utilizing metallic ribbon flow cartridge and low thermal mass heating units
DE4030368C1 (fr) * 1990-09-26 1991-11-14 B. Braun Melsungen Ag, 3508 Melsungen, De
US5108372A (en) * 1990-12-12 1992-04-28 Houston Advanced Research Center Intravenous fluid temperature regulation method and apparatus
WO1992017040A1 (fr) * 1991-03-15 1992-10-01 In-Touch Products Co. Coffret chauffant pour liquides parenteraux, systeme et methodes
US5211631A (en) * 1991-07-24 1993-05-18 Sheaff Charles M Patient warming apparatus
DE9201792U1 (de) * 1992-02-13 1992-05-21 Burgert, Bertram, 7816 Münstertal Mobil einsetzbarer Infusionserwärmer, insbesondere zum Warmhalten von Infusionslösungen in Flaschen, Plastikbehälter und Plastikbeuteln sowie deren Zuleitungssysteme zum menschlichen Körper

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19828923A1 (de) * 1998-06-29 2000-01-05 Fresenius Medical Care De Gmbh Heizung zur Erwärmung von medizinischen Flüssigkeiten
DE19828923B4 (de) * 1998-06-29 2006-01-26 Fresenius Medical Care Deutschland Gmbh Heizung zur Erwärmung von medizinischen Flüssigkeiten
DE19828923C5 (de) * 1998-06-29 2010-10-28 Fresenius Medical Care Deutschland Gmbh Heizung zur Erwärmung von medizinischen Flüssigkeiten
WO2000002608A1 (fr) * 1998-07-10 2000-01-20 Belmont Instrument Corporation Rechauffeur portatif pour liquide administre par voie intraveineuse
US6236809B1 (en) 1998-07-10 2001-05-22 Belmont Instrument Corporation Wearable intravenous fluid heater
US6480257B2 (en) 1998-07-10 2002-11-12 Belmont Instrument Corporation Heat exchanger useable in wearable fluid heater
US9737672B2 (en) 2007-08-07 2017-08-22 Belmont Instrument Corporation Hyperthermia, system, method, and components
US11000407B2 (en) 2007-08-07 2021-05-11 Belmont Instrument, Llc Hyperthermia, system, method, and components
US10485936B2 (en) 2016-11-30 2019-11-26 Belmont Instrument, Llc Rapid infuser with advantageous flow path for blood and fluid warming
US10507292B2 (en) 2016-11-30 2019-12-17 Belmont Instrument, Llc Rapid infuser with vacuum release valve
US10137257B2 (en) 2016-11-30 2018-11-27 Belmont Instrument, Llc Slack-time heating system for blood and fluid warming
US11872382B2 (en) 2016-11-30 2024-01-16 Belmont Instrument, Llc Rapid infuser with advantageous flow path for blood and fluid warming, and associated components, systems, and methods
US11813194B2 (en) 2017-03-06 2023-11-14 Board Of Regents, The University Of Texas System Water perfusion heat exchange pad for control of skin temperature
US11883626B2 (en) 2019-06-27 2024-01-30 Boston Scientific Scimed, Inc. Detection of an endoscope to a fluid management system
US11850396B2 (en) 2019-10-30 2023-12-26 Boston Scientific Scimed, Inc. System and method for monitoring fluid deficit
US12108985B2 (en) 2020-07-30 2024-10-08 Boston Scientific Scimed, Inc. Fluid management system with integrated laser fiber cooling

Also Published As

Publication number Publication date
JPH11507265A (ja) 1999-06-29
CA2223280A1 (fr) 1996-12-19
AU6265096A (en) 1996-12-30
EP0831948A1 (fr) 1998-04-01
KR19990022649A (ko) 1999-03-25

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