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System and method for augmented impedance sensing

  • US 7,956,620 B2
  • Filed: 08/12/2009
  • Issued: 06/07/2011
  • Est. Priority Date: 08/12/2009
  • Status: Active Grant
First Claim
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1. An impedance monitoring circuit for an electrosurgical generator, the monitoring circuit comprising:

  • an isolation transformer coupled to at least one of an active terminal and a return terminal of an electrosurgical generator, wherein the isolation transformer includes a primary winding coupled to a reference resistor and a secondary winding coupled to a load;

    a driver configured to transmit a sensor signal to the reference resistor and the load;

    a primary converter coupled to the reference resistor and the load and configured to detect a primary converted signal as a function of the sensor signal passing through the reference resistor and the load;

    a secondary converter coupled to the driver and configured to detect a secondary converted signal as a function of the sensor signal prior to passing through the reference resistor and the load; and

    a controller including a preprogrammed offset value, wherein the controller is configured to determine a fault condition based on the primary and secondary converted signals and the offset value.

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