Cooling system

• US 6,592,577 B2
• Filed: 01/26/2001
• Issued: 07/15/2003
• Est. Priority Date: 01/25/1999
• Status: Expired due to Term

• Current Assignee: Medtronic CryoCath LP (Medtronic Plc)
• Original Assignee: CryoCath Technologies Incorporated (Medtronic Plc)
• Inventors: Wittenberger, Dan, Abboud, Marwan, Lalonde, Jean-Pierre, Mahrouche, Rachid
• Primary Examiner(s): Dvorak, Linda C. M.
• Assistant Examiner(s): Ruddy, David M.
• Application Number:
  US09/771,031
• Publication Number:
  US 20010021847A1
• Time in Patent Office: 900 Days
• Field of Search: 128/DIG.27, 606/22, 606/21-26
• US Class Current: 606/22
• CPC Class Codes: A61B 18/02 by cooling, e.g. cryogenic techniques devices for cooling specific reflex points of the body within cell-life limits A61H39/06
• CPC Class Codes: A61B 2017/00084 Temperature
• CPC Class Codes: A61B 2017/00199 with a console, e.g. a control panel with a display
• CPC Class Codes: A61B 2018/0212 using an instrument inserted into a body lumen, e.g. catheter
• CPC Class Codes: A61B 2018/0262 using a circulating cryogenic fluid
• CPC Class Codes: A61B 2018/0268 with restriction of flow

Abstract

A cryogenic medical system includes a medical device and a console connectable to the medical device at a connection point. The console controls the temperature of the medical device. The console includes a first cooling system directing coolant to the medical device at a first temperature along a coolant supply line and a second cooling system chilling the coolant within the coolant supply line to a temperature below the first temperature before the coolant reaches the connection point.

Claims

1. A cryogenic medical system comprising:

a medical device, wherein the medical device includes a catheter;

a system component, the system component being connectable to the medical device at a connection point, the system component controlling temperature of the medical device, and the system component including

a first cooling system directing coolant to the medical device at a first temperature along a coolant supply line; and

a second cooling system chilling the coolant within the coolant supply line to a temperature below the first temperature before the coolant reaches the connection point,

wherein the first cooling system includes a coolant return line leading from the catheter to a coolant scavenging system, and wherein the first cooling system and the catheter comprise a substantially open-loop, and

wherein the second cooling system includes an enclosure having a fluid inlet and a fluid outlet;

the enclosure defining a fluid path from the inlet to the outlet, and the enclosure enveloping a portion of the coolant supply line, and

wherein the inlet is provided inside the enclosure.

2. The system of claim 1, wherein coolant is supplied to the first cooling system in a substantially liquid state.

3. The system of claim 1, wherein coolant is supplied to the first cooling system in a substantially gaseous state.

4. The system of claim 3, wherein the second cooling system chills the coolant within the first cooling system and coolant supply line from a substantially gaseous state to a substantially liquid state.

5. A cryogenic medical system comprising:

a medical probe;

a system component external to the medical probe, including

a first cooling system comprising a substantially closed loop first fluid pathway, the first cooling system comprising

a coolant supply line leading to the medical probe, and

a coolant return line leading from the medical probe;

a first compressor outputting coolant into the coolant supply line;

a vacuum pump in fluid communication with the first compressor and the coolant return line; and

a second cooling system conditioning the coolant within the coolant supply line, the second cooling system comprising

a heat exchanging chamber defining a closed volume second fluid pathway and having at least one fluid inlet and at least one fluid outlet, the chamber enclosing a portion of the coolant supply line, the portion of the coolant supply line defining at least one orifice in fluid communication with the first fluid pathway, the orifice being the fluid inlet for the second fluid pathway.

6. The system of claim 5, wherein the medical probe is a flexible catheter.

7. The system of claim 5, wherein the at least one orifice has a diameter between 0.0001 and 0.03 inches.

8. The system of claim 5, wherein the at least one fluid outlet has adjustable size, and wherein a rate at which the second cooling system exchanges heat with the first cooling system is adjustable by varying the adjustable size of the at least one fluid outlet.

9. The system of claim 5, wherein the chamber comprises a proximal end portion and a distal end portion, and wherein the at least one outlet is proximate the proximal end portion and the at least one fluid inlet is proximate the distal end portion.

10. The system of claim 8, wherein coolant is supplied to the first cooling system in substantially a liquid state.

11. The system of claim 5, wherein the chamber comprises a proximal end portion and a distal end portion, and wherein the at least one outlet is proximate the proximal end portion and the at least one fluid inlet is proximate the proximal end portion.

12. The system of claim 11, wherein coolant is supplied to the first cooling system in substantially a gaseous state.

13. A cryogenic medical system comprising:

a medical probe;

a system component external to the medical probe, including

a first cooling system comprising a substantially closed loop first fluid pathway, the first cooling system comprising

a coolant supply line leading to the medical probe, and

a coolant return line leading from the medical probe;

a first compressor outputting coolant into the coolant supply line;

a vacuum pump in fluid communication with the first compressor and the coolant return line; and

a second cooling system conditioning the coolant within the coolant supply line, the second cooling system comprising

a thermo-electric cooler having a first heat exchanging surface and a second heat exchanging surface, the second heat exchanging surface being cooler than the first heat exchanging surface, the second heat exchanging surface being proximate a portion of the coolant supply line, the first heat exchanging surface being proximate a supplemental external cooling source.

14. The system of claim 13, wherein the thermo-electric cooler is a peltier cooler.

15. The system of claim 13, wherein the supplemental external cooling source includes a convective air cooler.

16. The system of claim 13, wherein the supplemental external cooling source includes a heat sink.

17. The system of claim 13, wherein the supplemental external cooling source includes a second compressor and a condenser.

18. The system of claim 13, wherein the supplemental external cooling source includes a Joule-Thomson cooling device.