Heat exchange system for a pump device

• US 7,975,491 B2
• Filed: 08/07/2007
• Issued: 07/12/2011
• Est. Priority Date: 03/17/2005
• Status: Active Grant

• Current Assignee: Smisson-Cartledge Biomedical LLC
• Original Assignee: Smisson-Cartledge Biomedical LLC
• Inventors: York, Frederick J., Cartledge, Richard G., Field, David C., Koltz, Michael L., Smisson, Hugh F. III
• Primary Examiner(s): Jones; Melvin
• Application Number:
  US11/835,125
• Publication Number:
  US 20080156476A1
• Time in Patent Office: 1,435 Days
• Field of Search: 62/32, 62/36, 165/185, 604/113, 604/122
• US Class Current: 62/3.3
• CPC Class Codes: A61M 2005/1402 Priming
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: A61M 5/36 with means for eliminating or preventing injection or infusion of air into body dialysis systems, blood oxygenators A61M1/14; haemofiltration equipment A61M1/34; automatic tube cut-off A61M39/281
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media
• CPC Class Codes: F28D 2021/005 for medical applications heating or cooling appliances for medical treatment A61F7/00
• CPC Class Codes: F28F 2280/02 Removable elements

Abstract

A heat exchange system selectably controls the temperature of a fluid being delivered to a patient'"'"'s body by a pump device. The heat exchange system includes a thermal element and a heat exchanger that is removably coupled under pressure to the thermal element. The heat exchanger includes a first half made from thermally conductive material that correspondingly mates with the thermal element, a second half made from thermally conductive material opposite the first half, and an internal heat exchange zone existing between the first half and the second half, wherein fluid flows therethrough. The thermal element of the heat exchange system may controllably and safely warm and/or cool the fluid prior to delivery.

Claims

1. A heat exchange system for a pump device, comprising:

a. a thermal element; and

b. a heat exchanger removably coupled under pressure to said thermal element comprising;

a first half comprising thermally conductive material correspondingly mating with said thermal element;

a second half comprising thermally conductive material opposite said first half; and

an internal heat exchange zone existing between said first half and said second half, wherein fluid flows therethrough.

2. The heat exchange system of claim 1, wherein said thermal element comprises one of a resistive heater, a radiant heater, an induction-based heater, a microwave heater, a thermoelectric heat pump, or a thermoelectric cooler.

3. The heat exchange system of claim 1, wherein said thermal element comprises a heating element comprising a plurality of power resistors electrically connected to limit capacitive coupling and to create a plurality of heat points on said heating element.

4. The heat exchange system of claim 3, wherein said heating element comprises about three to five power resistors.

5. The heat exchange system of claim 3, wherein said plurality of power resistors have a total resistance between about 8 ohms to about 12 ohms.

6. The heat exchange system of claim 3, wherein said plurality of power resistors are connected to limit current leakage from the heating element to a patient to about 10 microamperes or less.

7. The heat exchange system of claim 3, wherein said plurality of power resistors limit capacitance coupling to about 100 picofarads or less.

8. The heat exchange system of claim 3, further comprising a thermally conductive thermal pad positioned between said heating element and said heat exchanger.

9. The heat exchange system of claim 3, wherein said heating element further comprises a heating platen and at least one ceramic insulator interposed between said plurality of resistors and said heating platen, and wherein said heating platen comprises a first surface that substantially mates with said first half of said heat exchanger and a second surface in communication with said plurality of resistors.

10. The heat exchange system of claim 9, wherein said heating platen is comprised of at least one of an aluminum alloy, copper, gold, silver, carbon foam, or a ceramic-based material.

11. The heat exchange system of claim 9, wherein said at least one ceramic insulator has a thermal conductivity of about 20 W/m-K or greater.

12. The heat exchange system of claim 9, further comprising a thermally conductive thermal pad positioned between said heating element and said heat exchanger, wherein said thermal pad is attached to said first surface of said heating platen or to said heat exchanger.

13. The heat exchange system of claim 1, wherein said heat exchanger comprises at least two symmetric units fixed together.

14. The heat exchange system of claim 1, wherein said heat exchanger comprises a single unit.

15. The heat exchange system of claim 1, wherein said heat exchanger is comprised of at least one of an aluminum, aluminum alloy, copper, gold, silver, carbon foam, or a ceramic-based material.

16. The heat exchange system of claim 1, wherein said internal heat exchange zone of said heat exchanger comprises a first and second plurality of overlapping fins.

17. The heat exchange system of claim 1, wherein said heat exchanger is removably coupled to said thermal element by an engaging actuator which actuates at least one clamping mechanism, wherein at least 100 pounds of compressive force is created between said heat exchanger and said thermal element by engaging said engaging actuator.

18. The heat exchange system of claim 1, wherein said thermal element is integrated within a pump housing and said heat exchanger is integrated within a disposable cartridge removably attached to said pump housing.

19. A heat exchange system for a pump device, comprising:

a. a cooling element comprising at least one thermoelectric cooler creating at least one cooling point on said cooling element; and

b. a heat exchanger removably coupled under pressure to said cooling element comprising;

a first half constructed from thermally conductive material correspondingly mating with said cooling element;

a second half constructed from thermally conductive material opposite said first half; and

an internal heat exchange zone existing between said first half and said second half, wherein fluid flows therethrough.

20. The heat exchange system of claim 19, wherein said at least one thermoelectric cooler comprises a peltier thermoelectric cooler comprising an array of n-type and p-type semiconductors disposed between two ceramic insulators.

21. The heat exchange system of claim 20, wherein said cooling element is integrated within a pump housing further comprises:

a heating platen;

a first surface that substantially mates with said first half of said heat exchanger; and

a second surface in communication with said at least one thermoelectric cooler.

22. The heat exchange system of claim 21, further comprising a thermally conductive thermal pad positioned between said cooling element and said heat exchanger.

23. The heat exchange system of claim 19, further comprising a heating element comprising a plurality of power resistors connected to create low capacitive coupling and to create a plurality of heat points on said heating element, wherein said heating element is interchangeable with said cooling element.

24. The heat exchange system of claim 19, wherein said cooling element cools and substantially maintains fluid at a temperature between about 0°

Celsius and about 37°

Celsius.

25. A heat exchange system for a pump device, comprising:

a. a heating and cooling element comprising at least one thermoelectric heat pump selectably creating at least one heat point or at least one cooling point on said heating and cooling element; and

b. a heat exchanger removably coupled under pressure to said heating and cooling element comprising;

a first half constructed from thermally conductive material correspondingly mating with said cooling element;

a second half constructed from thermally conductive material opposite said first half; and

an internal heat exchange zone existing between said first half and said second half, wherein fluid flows therethrough.

26. The heat exchange system of claim 25, wherein said at least one thermoelectric heat pump comprises a peltier thermoelectric heat pump comprising an array of n-type and p-type semiconductors disposed between two ceramic insulators that selectably sinks or sources heat from or to said heat exchanger by reversing the flow of current through said peltier thermoelectric heat pump.

27. The heat exchange system of claim 25, comprising a plurality of thermoelectric heat pumps selectably creating a plurality of heat points or a plurality of cooling points on said heating and cooling element, wherein each of said plurality of said thermoelectric heat pumps comprises a peltier thermoelectric heat pump comprising an array of n-type and p-type semiconductors disposed between two ceramic insulators.

28. The heat exchange system of claim 25, wherein said heating and cooling element is integrated within a pump housing, and further comprises:

a heating platen;

a first surface that substantially mates with said first half of said heat exchanger; and

a second surface in communication with said at least one thermoelectric heat pump.

29. The heat exchange system of claim 25, further comprising a thermally conductive thermal pad positioned between said cooling element and said heat exchanger.