System and method for controlling rate of heat exchange with patient
First Claim
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1. A method for changing the temperature of the body of a patient using a thermal exchange device comprising:
- transferring heat between the body of the patient and the thermal exchange device at a first heat transfer rate by implanting a catheter into the body of the patient and circulating a heat exchange fluid with a pump in a heat exchange relationship between the catheter and a fluid bath;
stopping the pump when a target temperature is reached and leaving the catheter in the patient;
slewing the fluid bath;
restarting the pump; and
transferring heat between the body of the patient and the thermal exchange device at a second heat transfer rate.
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Abstract
A patient control system uses a patient-implanted catheter in thermal communication with a fluid bath via a circulating fluid circuit. A controller automatically controls the temperature of the fluid bath as required for selectively cooling or heating the patient in accordance with patient temperature measurements. The controller thermally decouples the catheter and patient from the fluid bath during changes in fluid bath temperatures in order to overcome the effects of system thermal mass.
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Citations
24 Claims
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1. A method for changing the temperature of the body of a patient using a thermal exchange device comprising:
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transferring heat between the body of the patient and the thermal exchange device at a first heat transfer rate by implanting a catheter into the body of the patient and circulating a heat exchange fluid with a pump in a heat exchange relationship between the catheter and a fluid bath; stopping the pump when a target temperature is reached and leaving the catheter in the patient; slewing the fluid bath; restarting the pump; and transferring heat between the body of the patient and the thermal exchange device at a second heat transfer rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for changing the temperature of the body of a patient using a catheter in heat exchange relationship with a fluid bath, the method comprising:
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establishing a first fluid bath temperature; when the fluid bath is at the first fluid bath temperature, transferring heat between the fluid bath and the body of the patient by circulating a heat exchange fluid in heat exchange relationship with the catheter and the fluid bath; stopping the circulation of fluid when a target temperature is reached and leaving the catheter in the patient; establishing a second fluid bath temperature; and when the fluid bath is at the second fluid bath temperature, restarting the circulation of fluid and transferring heat between the fluid bath and the body of the patient. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for changing the temperature of the body of a patient comprising:
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implanting a catheter into the body of the patient; circulating a heat exchange fluid in heat exchange relationship between the patient and a fluid bath at a first transfer rate; stopping the circulation of the heat exchange fluid between the patient and the fluid bath when a target temperature is reached and leaving the catheter in the patient; slewing the fluid bath; restarting the circulation of the heat exchange fluid; and circulating the heat exchange fluid between the catheter and the fluid bath at a second transfer rate. - View Dependent Claims (24)
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Specification