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System and method for closed loop monitoring of monopolar electrosurgical apparatus

  • US 7,927,328 B2
  • Filed: 01/24/2007
  • Issued: 04/19/2011
  • Est. Priority Date: 01/24/2006
  • Status: Active Grant
First Claim
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1. An electrosurgical system comprising:

  • a generator configured to generate at least one electrosurgical coagulation waveform, the generator includes a closed loop control system that controls the at least one electrosurgical coagulation waveform, the closed loop control system including;

    a sensor configured to sense at least one of a tissue property and an energy property and transmit the at least one of a tissue property and an energy property to a gain controller as a voltage sensor signal having an amplitude;

    the gain controller configured to process the voltage sensor signal to reduce the amplitude of the voltage sensor signal and obtain a signal to noise ratio of the voltage sensor signal within a predetermine range;

    the gain controller being a voltage gain controller that includes;

    a sensor voltage scaler control configured to scale the amplitude of the voltage sensor signal and to generate a scaled sensor signal;

    a gain control configured to process a variable DC level control signal to generate a gain control signal; and

    a multiplier coupled to the sensor voltage scaler and the gain control, the multiplier configured to multiply in real-time the scaled sensor signal and the gain control signal to normalize the voltage sensor signal independent of the amplitude thereof; and

    a microprocessor coupled to the generator and configured to adjust the at least one electrosurgical coagulation waveform as a function of the voltage sensor signal.

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