Rapid induction of mild hypothermia

• US 7,179,279 B2
• Filed: 09/30/2002
• Issued: 02/20/2007
• Est. Priority Date: 09/30/2002
• Status: Active Grant

• Current Assignee: Physio-Control Incorporated (Stryker Corporation)
• Original Assignee: Medtronic Physio Control Corp. (Medtronic Plc)
• Inventors: Nygaard, Larry R., Radons, Stephen W., Chester, Steven M., Abbenhouse, Martin S.
• Primary Examiner(s): Dvorak; Linda C.
• Application Number:
  US10/262,604
• Publication Number:
  US 20040064170A1
• Time in Patent Office: 1,604 Days
• Field of Search: 607/104, 607108-112, 607/114, 602/2, 622/593, 245/8
• US Class Current: 607/108
• CPC Class Codes: A61F 2007/0001 Body part
• CPC Class Codes: A61F 2007/0057 of gas, e.g. air or carbon dioxide
• CPC Class Codes: A61F 2007/0063 for cooling
• CPC Class Codes: A61F 2007/0233 connected to or incorporated in clothing or garments A61F2007/023 takes precedence
• CPC Class Codes: A61F 2007/026 with a fluid absorbing layer
• CPC Class Codes: A61F 7/02 Compresses or poultices for effecting heating or cooling

Abstract

In general, the disclosure presents techniques for rapidly cooling the body of a patient. A cooling garment is placed in contact with the body of the patient. Spacers within the cooling garment create a space between at least a portion of the cooling garment and the body of the patient. The cooling garment receives a coolant from a coolant supply and delivers the coolant to the body of the patient. The heat from the body of the patient may evaporate the coolant. A carrier gas, which circulates within the space between the cooling garment and the patient, carries the gaseous coolant out of the cooling garment via an exit port. The rapid cooling of the patient may slow the neurological damage to the patient.

Claims

1. A device comprising:

a garment configured to be placed in contact with a body;

a spacer configured to separate at least part of the garment from the body defining a space;

a seal member for separating the space from an exterior environment;

a coolant delivery conduit configured to deliver a coolant to the body in the space;

a carrier gas intake port in the garment for fluidly connecting the space to a carrier gas supply;

an exit port in the garment for fluidly connecting the space to the exterior environment; and

a carrier gas mover for moving the carrier gas within the space.

2. The device of claim 1, wherein the coolant is a liquid.

3. The device of claim 2, wherein the liquid coolant is one of water and alcohol.

4. The device of claim 2, wherein the liquid coolant is a mixture of water and alcohol.

5. The device of claim 1, wherein the coolant is one of a gas and a gel.

6. The device of claim 1, wherein the carrier gas from the carrier gas supply is one of carbon dioxide, nitrogen, and air.

7. The device of claim 1, wherein the carrier gas is dehumidified.

8. The device of claim 1, further comprising a fastener configured to secure the garment to the body.

9. The device of claim 8, wherein the fastener is one of a hook and loop fastener, a zipper, a button, a clip, a strap, a buckle, and an adhesive.

10. The device of claim 1, wherein the coolant delivery conduit includes at least one aperture through which the coolant exits the coolant delivery conduit.

11. The device of claim 1, wherein the carrier gas mover includes one of a fan, a pressurized gas supply, and a pump.

12. The device of claim 1, wherein the coolant delivery conduit is the seal member.

13. The device of claim 1, wherein the seal member is one of a flexible rubber web, an O-ring tube seal, and a collapsible tube.

14. The device of claim 1, further comprising a body access configured to allow access to a portion of the body.

15. The device of claim 1, wherein the spacer is coupled to the garment.

16. The device of claim 1, wherein the spacer is attachable to the garment.

17. The device of claim 1, wherein the spacer includes one of a chain and air.

18. The device of claim 1, wherein the coolant delivery conduit is the spacer.

19. The device of claim 1, further comprising an absorbent layer in contact with the body.

20. The device of claim 19, wherein the absorbent layer is constructed of one of cotton and polypropylene.

21. The device of claim 1, further comprising a support pad configured to support the body.

22. The device of claim 21, wherein the support pad is external to the cooling garment.

23. The device of claim 21, wherein the support pad is internal to the cooling garment and is absorbent.

24. The device of claim 1, further comprising a sensor generating a signal.

25. The device of claim 24, further comprising a processor for receiving the signal.

26. The device of claim 25, further comprising a communication link that communicates the signal from the sensor to the processor.

27. The device of claim 26, wherein the communication link is one of an optical fiber link, a wireless link, and a wire link.

28. The device of claim 25, further comprising a housing for the processor.

29. The device of claim 24, wherein the spacer includes the sensor.

30. The device of claim 24, further comprising a second sensor.

31. The device of claim 24, wherein the sensor is one of a temperature sensor, a thermocouple, an oxygen sensor, a velocity Doppler probe, an electrocardiogram (ECG) sensor, and an electroencephalograph (EEG) sensor.

32. The device of claim 1, further comprising an expansion valve interposed between the space and the carrier gas supply.

33. The device of claim 1, further comprising a battery pack.

34. The device of claim 1, wherein the garment is constructed of electrically insulated material.

35. The device of claim 1, wherein the garment includes a headgear configured to contact at least a portion of a head.

36. The device of claim 35, wherein the headgear further includes an inner and outer shell.

37. The device of claim 1, wherein the garment includes a body gear configured to contact at least a portion of the body.

38. The device of claim 37, wherein the body gear includes at least one of an upper body gear and a lower body gear.

39. The device of claim 38, wherein the upper body gear is configured to cover at least a portion of an armpit of the body.

40. The device of claim 38, wherein the lower body gear is configured to cover at least a portion of a groin of the body.

41. The device of claim 1, wherein the garment includes:

a headgear configured to contact at least a portion of a head; and

a body gear configured to contact at least a portion of the body.

42. A method comprising:

separating at least a portion of a cooling garment from a body of a patient with a spacer to create a space;

isolating the space between the body and the garment from an external environment via a seal member;

allowing a coolant to exit a coolant delivery conduit onto the body in the space;

allowing a carrier gas to enter the space via a carrier gas port; and

expelling the coolant in a gaseous state from an exit port in the garment.

43. The method of claim 42, wherein the coolant delivery conduit includes apertures, and wherein allowing the coolant to exit the coolant delivery conduit includes one of dripping the coolant from the apertures, misting the coolant from the apertures, seeping the coolant from the apertures, and spraying the coolant from the apertures.

44. The method of claim 42, further comprising securing the garment to the body.

45. The method of claim 44, wherein securing the garment to the body includes fastening a fastener that is coupled to the garment.

46. The method of claim 42, wherein allowing a carrier gas to enter the space via the carrier gas port further comprises allowing a carrier gas to enter the space via an expansion valve coupled to a carrier gas port.

47. The method of claim 42, further comprising circulating the carrier gas within the space via a carrier gas mover.

48. The method of claim 42, further comprising cooling at least one of the carrier gas and the coolant.

49. The method of claim 42, further comprising dehumidifying the carrier gas.

50. The method of claim 42, further comprising evaporating the coolant with heat from the body.

51. The method of claim 42, further comprising absorbing the coolant that is delivered to the body with an absorbent layer.

52. The method of claim 42, further comprising allowing access to the body of the patient via a body access in the garment.

53. The method of claim 42, further comprising:

generating a signal as a function of a patient parameter; and

relaying the signal to a processor via a communication link.

54. The method of claim 53, further comprising processing the signal.

55. The method of claim 42, farther comprising blowing warm air on an exposed body part of the patient.

56. The method of claim 42, further comprising injecting a cooled saline solution into the blood stream of the patient.

57. The method of claim 42, further comprising supplying oxygen to the patient.

58. The method of claim 57, further comprising cooling the supplied oxygen.

59. The method of claim 42, further comprising partitioning the space into areas, each area including a carrier gas port.

60. A device comprising:

an inner shell configured to be placed proximate to a body part of a patient, a space between the body part and the inner shell being an inner space;

an outer shell surrounding the inner shell, a space between the outer shell and the inner shell being an outer space in fluid communication with the inner space;

a seal member for forming a seal between the spaces and an exterior environment; and

an exit port formed through the inner shell and the outer shell for expelling a coolant and a gas, the gas moving from the outer space to the inner space.

61. The device of claim 60, further comprising an inner spacer configured to separate the inner shell from the body part.

62. The device of claim 60, further comprising an outer spacer for separating the inner shell from the outer shell.

63. The device of claim 60, wherein the inner shell and outer shell are deformable to conform to the body part.

64. The device of claim 60, further comprising a fastener configured to secure the inner shell to the body part.

65. The device of claim 60, further comprising:

a sensor configured to contact the body part and generate a signal; and

a processor for receiving the signal.

66. The device of claim 60, the outer shell including a coolant inlet port.

67. The device of claim 60, the outer shell including a coolant inlet port and a coolant outlet port.

68. The device of claim 60, further comprising a carrier gas intake port in fluid communication with the outer space.

69. The device of claim 68, further comprising a carrier gas mover for driving the gas from the carrier gas intake port to the exit port.

70. The device of claim 69, wherein the carrier gas mover is one of a fan, a pressurized gas source, and a pump.

71. The device of claim 60, further comprising a body access configured to allow access to the body of the patient.

72. The device of claim 60, wherein the outer shell is electrically insulated.

73. The device of claim 60, further comprising a battery pack.

74. The device of claim 60, further comprising an expander configured to fit the device on different size bodies.

75. The device of claim 60, further comprising a cavity for housing a processor.

76. A device comprising:

a garment configured to be placed in contact with a body;

a spacer configured to separate at least part of the garment from the body defining a space;

a coolant delivery conduit configured to deliver a coolant to the body in the space;

a carrier gas intake port in the garment for fluidly connecting the space to a carrier gas supply;

an exit port in the garment for fluidly connecting the space to the exterior environment;

a carrier gas mover for moving the carrier gas within the space; and

a support pad configured to support the body, wherein the support pad is internal to the garment and is absorbent.

77. A device comprising:

a garment configured to be placed in contact with a body;

a spacer configured to separate at least part of the garment from the body defining a space;

a coolant delivery conduit configured to deliver a coolant to the body in the space;

a carrier gas intake port in the garment for fluidly connecting the space to a carrier gas supply;

an exit port in the garment for fluidly connecting the space to the exterior environment;

a carrier gas mover for moving the carrier gas within the space; and

a sensor generating a signal, wherein the spacer includes the sensor.

78. The device of claim 77, further comprising a processor for receiving the signal.

79. The device of claim 78, further comprising a communication link that communicates the signal from the sensor to the processor.

80. The device of claim 79, wherein the communication link is one of an optical fiber link, a wireless link, and a wire link.

81. The device of claim 78, further comprising a housing for the processor.

82. The device of claim 77, further comprising a second sensor.

83. The device of claim 77, wherein the sensor is one of a temperature sensor, a thermocouple, an oxygen sensor, a velocity Doppler probe, an electrocardiogram (ECG) sensor, and an electroencephalograph (EEG) sensor.