System and method for inducing hypothermia with active patient temperature control employing catheter-mounted temperature sensor and temperature projection algorithm
First Claim
1. In a system in which a working fluid is circulated through a catheter and a heal transfer element, the working fluid having a temperature different from a patient temperature, a method of controlling the administration of a thermal therapy, comprising:
- entering a target patient temperature into the system;
inserting a catheter having a heat transfer element positioned at a distal tip of the catheter into a blood vessel of a patient, the catheter having a supply lumen fin supplying a working fluid to the heat transfer element and a return lumen for returning a working fluid from the heat transfer element;
circulating a working fluid through the catheter and the heat transfer element, the working fluid having a temperature different from the patient temperature;
circulating a working fluid and not determining a control temperature, for a predetermined period of time based on the difference between a temperature determined from a signal from a temperature sensor mounted at or adjacent the distal tip of the heat transfer element and the target patient temperature;
after the predetermined period of time, receiving a signal from the temperature sensor and determining a control temperature based on the signal;
using the control temperature to control the temperature of the working fluid.
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Accused Products
Abstract
Embodiments of the invention provide a system for temperature control of the human body. The system includes an indwelling catheter with a tip-mounted heat transfer element. The catheter is fluidically coupled to a console that provides a heated or cooled heat transfer working fluid to exchange heat with the heat transfer element, thereby heating or cooling blood. The heated or cooled blood then heats or cools the patient'"'"'s body or a selected portion thereof. In particular, methods and devices, including software, are provided for administering cooling or rewarming and controlling the same based on a projected control temperature measured by a temperature sensor within the catheter.
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Citations
44 Claims
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1. In a system in which a working fluid is circulated through a catheter and a heal transfer element, the working fluid having a temperature different from a patient temperature, a method of controlling the administration of a thermal therapy, comprising:
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entering a target patient temperature into the system; inserting a catheter having a heat transfer element positioned at a distal tip of the catheter into a blood vessel of a patient, the catheter having a supply lumen fin supplying a working fluid to the heat transfer element and a return lumen for returning a working fluid from the heat transfer element; circulating a working fluid through the catheter and the heat transfer element, the working fluid having a temperature different from the patient temperature; circulating a working fluid and not determining a control temperature, for a predetermined period of time based on the difference between a temperature determined from a signal from a temperature sensor mounted at or adjacent the distal tip of the heat transfer element and the target patient temperature; after the predetermined period of time, receiving a signal from the temperature sensor and determining a control temperature based on the signal; using the control temperature to control the temperature of the working fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A heat transfer catheter for inducing a therapeutic state of hypothermia in a patient, for maintaining the temperature of a patient, or for rewarming a patient, comprising:
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a catheter having a proximal end capable of being coupled to an input of a source of working fluid and a distal end coupled to a heat transfer element; a supply lumen disposed within the catheter, the proximal end of the supply lumen capable of being coupled to an output of a source of working fluid and a distal end terminating at or within the heat transfer element; and a temperature sensor disposed on or within the heat transfer element, wherein the heat transfer element includes at least two heat transfer segments separated by a flexible joint, and wherein the heat transfer segments have helical ridges and grooves. - View Dependent Claims (42)
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43. A heat transfer catheter for inducing a therapeutic stale of hypothermia in a patient, for maintaining the temperature of a patient, or for rewarming a patient, comprising:
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a catheter having a proximal end capable of being coupled to an input of a source of working fluid and a distal end coupled to a heat transfer element; a supply lumen disposed within the catheter, the proximal end of the supply lumen capable of being coupled to an output of a source of working fluid and a distal end terminating at or within the heat transfer element; and a temperature sensor disposed on or within the heat transfer element, wherein the heat transfer element includes a straight supply lumen and a helical return lumen, the helical return lumen encircling the straight supply lumen. - View Dependent Claims (44)
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Specification