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APPARATUS AND METHOD FOR CREATING, MAINTAINING, AND CONTROLLING A VIRTUAL ELECTRODE USED FOR THE ABLATION OF TISSUE

  • US 20080015563A1
  • Filed: 07/24/2007
  • Published: 01/17/2008
  • Est. Priority Date: 02/22/1995
  • Status: Active Grant
First Claim
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1. A system for producing, maintaining, and controlling a virtual electrode for provision of an ablative therapy through the virtual electrode to a target tissue of a body of a patient, the system providing a conductive fluid and an RF power to the target tissue to create the virtual electrode, the system comprising:

  • a source of conductive fluid selectively providing conductive fluid to the target tissue;

    a surgical instrument including an electrode for delivering RF power to distributed conductive fluid to create a virtual electrode;

    a primary temperature sensor for sensing a temperature of the body of the patient in an area of the target tissue;

    an impedance detector for measuring information indicative of an impedance of the body of the patient in the area of the target tissue to passage of RF current; and

    a processor for determining a desired RF power applied by the electrode as Ablation_RF_Power=(max_RF_Power)*(proportional feedback+integral feedback+derivative feedback);

    wherein max_RF_Power is a maximum power level determined as a function of the measured impedance, proportional feedback is a function of a proportion of the sensed temperature relative to a threshold temperature, integral feedback is a function of an integral of the sensed temperature relative to the threshold temperature, and derivative feedback is a function of a derivative of the sensed temperature relative to the threshold temperature.

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