System and method for patient temperature control employing temperature projection algorithm
First Claim
1. A method of controlling the administration of a thermal therapy, comprising:
- 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 for 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;
receiving a signal from a temperature sensor mounted in one of the supply lumen or the return lumen;
determining a control temperature based on the signal; and
using the control temperature to control the temperature of the working fluid, wherein the temperature sensor is selected from the group consisting of thermistors, thermocouples, and combinations thereof, and further wherein the temperature sensor is two thermistors, and further comprising receiving a safety monitor signal from one of the two thermistors, and further comprising causing the working fluid to stop circulating if a value of control temperature measured by the safety monitor signal falls outside a predetermined range.
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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.
81 Citations
3 Claims
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1. A method of controlling the administration of a thermal therapy, comprising:
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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 for 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;
receiving a signal from a temperature sensor mounted in one of the supply lumen or the return lumen;
determining a control temperature based on the signal; and
using the control temperature to control the temperature of the working fluid, wherein the temperature sensor is selected from the group consisting of thermistors, thermocouples, and combinations thereof, and further wherein the temperature sensor is two thermistors, and further comprising receiving a safety monitor signal from one of the two thermistors, and further comprising causing the working fluid to stop circulating if a value of control temperature measured by the safety monitor signal falls outside a predetermined range. - View Dependent Claims (2)
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3. A catheter system having a heat transfer element at a distal end thereof for insertion into the vascular system of a patient for controlling or managing the temperature of the patient, comprising:
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a catheter, the catheter having a heat transfer element mounted to a distal end thereof, the catheter having a supply lumen for transferring a working fluid to the heat transfer element and a return lumen for transferring a working fluid from the heat transfer element;
a source of working fluid, the source of working fluid having an outlet fluidically coupled to the supply lumen and an inlet fluidically coupled to the return lumen;
a control circuit to control the temperature and the pressure of the working fluid;
a remote temperature sensor disposed on or within a catheter within the patient, the remote temperature sensor coupled to the control circuit to provide a signal thereto, wherein the remote temperature sensor is mounted on a guidewire, a Swan-Ganz catheter, or an introducer sheath.
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Specification