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System and method for inducing hypothermia with active patient temperature control employing catheter-mounted temperature sensor and temperature projection algorithm

  • US 7,458,984 B2
  • Filed: 01/28/2004
  • Issued: 12/02/2008
  • Est. Priority Date: 01/23/1998
  • Status: Expired due to Fees
First Claim
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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:

  • 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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