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System and method for return electrode monitoring

  • US 8,790,337 B2
  • Filed: 05/25/2012
  • Issued: 07/29/2014
  • Est. Priority Date: 02/04/2008
  • Status: Active Grant
First Claim
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1. A return electrode monitoring system comprising:

  • at least one return electrode pad including at least one pair of split electrode pads;

    a detection circuit operatively coupled to the at least one pair of split electrode pads; and

    a controller coupled to the detection circuit and configured to provide a drive signal to the detection circuit, wherein the detection circuit is adapted to measure a response signal in response to the drive signal and convert the response signal to a frequency response, the controller being further configured to determine a phase of the drive signal with respect to a frequency of the response signal, a complex impedance across the at least one pair of split electrode pads as a function of the frequency response, and a frequency shift as a function of the phase of the drive signal.

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