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Imaginary impedance process monitoring and intelligent shut-off

  • US 8,486,061 B2
  • Filed: 08/24/2012
  • Issued: 07/16/2013
  • Est. Priority Date: 01/12/2009
  • Status: Expired due to Fees
First Claim
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1. A method for supplying electrosurgical energy to tissue, comprising the steps of:

  • measuring at least one of an imaginary impedance and a rate of change of the imaginary impedance of tissue; and

    regulating output of the electrosurgical energy from an electrosurgical generator based on the at least one of the imaginary impedance and rate of change of the imaginary impedance;

    to continue outputting the electrosurgical energy when the rate of change of the imaginary impedance is above a first predetermined threshold;

    to discontinue outputting of the electrosurgical energy when the rate of change of the imaginary impedance is below a second predetermined threshold; and

    to commence termination of the electrosurgical energy when the rate of change of the imaginary impedance is between the first and second predetermined thresholds for a duration of a predetermined time delay.

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