Method and apparatus for cardiopulmonary bypass patient temperature control
First Claim
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1. A method for treating a patient comprising:
- reducing the core body temperature of the patient below normal body temperature by placing a catheter in a blood flow path of the patient and transferring heat from the blood in the blood flow path to the catheter; and
initiating cardiopulmonary bypass of the patient when the core body temperature of the patient is below normal body temperature.
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Abstract
A cardiopulmonary bypass patient is precooled using an indwelling catheter. Cardiopulmonary bypass is initiated when a target temperature or range are achieved, as determined by automatic temperature feedback provided to a control module. The patient may also be rewarmed at a controlled rate during or after termination of cardiopulmonary bypass such that faster and safer termination is realized.
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Citations
29 Claims
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1. A method for treating a patient comprising:
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reducing the core body temperature of the patient below normal body temperature by placing a catheter in a blood flow path of the patient and transferring heat from the blood in the blood flow path to the catheter; and
initiating cardiopulmonary bypass of the patient when the core body temperature of the patient is below normal body temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
determining the core body temperature; and
controlling the rate of heat transfer from the blood in the blood flow path to the catheter based on the determination of core body temperature.
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4. The method of claim 1, wherein the catheter is placed in the central venous system of the patient.
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5. The method of claim 1, wherein transferring comprises circulating in the catheter a heat exchange fluid having a temperature below the temperature of the blood in the blood flow path.
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6. The method of claim 5, wherein circulating comprises:
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inflating one or more balloons of the catheter; and
circulating the heat exchange fluid in the inflated one or more balloons.
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7. The method of claim 5, wherein the temperature of the heat exchange fluid is about 4°
- C.
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8. The method of claim 5, wherein reducing the core body temperature of the patient further comprises:
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determining the core body temperature; and
controlling the rate of heat transfer from the blood in the blood flow path to the catheter based on the determination of core body temperature.
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9. The method of claim 8, wherein controlling comprises selectively removing heat from the heat exchange fluid.
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10. The method of claim 1, further comprising:
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terminating cardiopulmonary bypass when the core body temperature of the patient is below normal body temperature.
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11. The method of claim 10, wherein terminating comprises weaning off of bypass.
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12. The method of claim 10, wherein terminating comprises discontinuing a blood pumping function of cardiopulmonary bypass.
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13. The method of claim 10, wherein terminating comprises removing a cross clamp associated with cardiopulmonary bypass.
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14. The method of claim 10, wherein terminating comprises removing a cannula associated with cardiopulmonary bypass.
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15. The method of claim 10, wherein terminating comprises closing the chest of the patient.
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16. The method of claim 10, wherein terminating is conducted when the core body temperature is about 32°
- C.-34°
C.
- C.-34°
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17. The method of claim 10, further comprising:
increasing the core body temperature of the patient at an operator selected rate.
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18. A method for treating a patient comprising:
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performing cardiopulmonary bypass of the patient, including lowering the body temperature of the patient to below normal body temperature;
terminating cardiopulmonary bypass of the patient at a core body temperature below normal body temperature; and
during or after terminating cardiopulmonary bypass, selectively adding heat to the patient to thereby raise the core body temperature of the patient, wherein at least one of;
the act of lowering the body temperature, and the act of selectively adding heat to the patient, is undertaken at least in part by placing a catheter in a blood flow path of the patient, and transferring heat between the catheter and the blood in the blood flow path.- View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
determining the core body temperature; and
controlling the rate of heat transfer from the catheter to the blood in the blood flow path based on the determination of core body temperature.
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27. The method of claim 18, wherein the catheter is placed in the central venous system of the patient.
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28. The method of claim 18, wherein transferring comprises circulating in the catheter a heat exchange fluid having a temperature above the temperature of the blood in the blood flow path.
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29. The method of claim 28, wherein circulating comprises:
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inflating one or more balloons of the catheter; and
circulating the heat exchange fluid in the inflated one or more balloons.
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Specification