Patient heat exchange system with two and only two fluid loops

• US 10,500,088 B2
• Filed: 02/14/2014
• Issued: 12/10/2019
• Est. Priority Date: 02/14/2014
• Status: Active Grant

• Current Assignee: Zoll Circulation Incorporated (Asahi Kasei Corporation)
• Original Assignee: Zoll Circulation Incorporated (Asahi Kasei Corporation)
• Inventors: Dabrowiak, Jeremy Thomas, Pendry, Craig Wendell, Pistor, Christoph Matthias
• Primary Examiner(s): Smith, Kaitlyn E
• Assistant Examiner(s): Ekrami, Yasamin
• Application Number:
  US14/180,719
• Publication Number:
  US 20150230975A1
• Time in Patent Office: 2,125 Days
• CPC Class Codes: A61F 2007/0056 for cooling
• CPC Class Codes: A61F 2007/126 for invasive application, e.g. for introducing into blood vessels
• CPC Class Codes: A61F 7/0085 Devices for generating hot or cold treatment fluids
• CPC Class Codes: A61F 7/02 Compresses or poultices for effecting heating or cooling
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/127 with provisions for heating or cooling
• CPC Class Codes: A61M 2205/366 by liquid heat exchangers
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media
• CPC Class Codes: F25B 39/02 Evaporators
• CPC Class Codes: F28D 1/035 with U-flow or serpentine-flow inside the conduits F28D1/0341 takes precedence
• CPC Class Codes: F28D 2021/005 for medical applications heating or cooling appliances for medical treatment A61F7/00
• CPC Class Codes: F28F 3/12 Elements constructed in the shape of a hollow panel, e.g. with channels F28D1/02, F28D1/03 take precedence

Abstract

A heat exchange system for exchanging heat with working fluid from an intravascular heat exchange catheter or an external heat exchange pad includes a working fluid that circulates between the catheter or pad and a fluid cassette, and a refrigerant system that flows against the outer sides of cold plates between which the cassette is disposed.

Claims

1. A heat exchange system for exchanging heat with working fluid from an intravascular heat exchange catheter or an external heal exchange pad, comprising:

a working fluid circuit configured for circulating working fluid between a fluid cassette and the catheter or pad; and

a refrigerant circuit configured for circulating refrigerant between a compressor and sides of heat exchange plates between which the cassette is disposable, wherein each heat exchange plate communicates with a source of refrigerant, wherein a cassette slot is defined between the heat exchange plates for receiving the fluid cassette, wherein the heat exchange plates abut each other along left and right side walls, wherein respective vertically elongated cassette frame receptacles are located immediately inboard of the respective left and right side walls with the slot extending between the side walls and terminating at the receptacles, the frame receptacles being wider than the slot and extending past opposed sides of the slot;

wherein a chamfer is formed in at least one of the heat exchange plates and is configured to accommodate ballooning in the fluid cassette.

2. The system of claim 1, wherein the working fluid circuit is configured for circulating working fluid between the fluid cassette and the catheter.

3. The system of claim 1, wherein the working fluid circuit is configured for circulating working fluid between the fluid cassette and the pad.

4. The system of claim 1, wherein at least one heat exchange plate is formed with a serpentine passageway through which the refrigerant can flow.

5. The system of claim 1, wherein a distance between the heat exchange plates is between twenty nine mils and thirty one mils (0.029″

-0.031″

).

6. The system of claim 1, wherein the heat exchange plates are square.

7. The heat exchange system of claim 1, wherein each heat exchange plate is associated with its own respective refrigerant inlet and outlet tubes through which each heat exchange plate communicates with a source of refrigerant.

8. The system of claim 1, wherein the frame receptacles extend laterally beyond opposed first and second edges of the slot.

9. A system comprising:

two heat transfer plates parallel to each other and defining a slot between them configured for receiving a working fluid cassette through which working fluid flows to and from an intravascular catheter in a working fluid circuit wherein each heat transfer plate communicates with a source of refrigerant;

wherein the heat transfer plates abut each other along left and right side walls and respective vertically elongated cassette frame receptacles are located immediately inboard of the respective side walls and are formed in each plate with the slot extending between the side walls and terminating at the receptacles, the frame receptacles being wider than the slot and wherein a chamfer is formed in at least one of the heat transfer plates and is configured to accommodate ballooning in the working fluid cassette.

10. The system of claim 9, wherein a distance between the heat transfer plates is less than forty mils (0.040″

).

11. The system of claim 9, wherein a distance between the heat transfer plates is between twenty nine mils and thirty one mils (0.029″

-0.031″

).

12. The system of claim 9, wherein the heat transfer plates are square.

13. The system of claim 9, wherein at least one heat transfer plate is formed with a serpentine passageway through which the refrigerant flows.

14. The system of claim 9, wherein each heat transfer plate is associated with its own respective refrigerant inlet and outlet tubes through which each heat transfer plate communicates with a source of refrigerant.