System and method for augmented impedance sensing
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United States of America Patent
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Jan 7, 2014
Grant Date -
Aug 25, 2011
app pub date -
Apr 29, 2011
filing date -
Aug 12, 2009
priority date (Note) -
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Abstract
An impedance monitoring circuit for an electrosurgical generator. The monitoring circuit includes an isolation transformer coupled to an active terminal and a return terminal of an electrosurgical generator. The isolation transformer includes a primary winding coupled to a reference resistor and a secondary winding coupled to a load. A driver transmits a sensor signal to the reference resistor and the load. A primary converter coupled to the reference resistor and the load detects 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 detects a secondary converted signal as a function of the sensor signal prior to passing through the reference resistor and the load. A controller determines a fault condition based on the primary and secondary converted signals.
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