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Electrosurgical generator with high-frequency pulse width modulated feedback power control

  • US 4,727,874 A
  • Filed: 09/10/1984
  • Issued: 03/01/1988
  • Est. Priority Date: 09/10/1984
  • Status: Expired due to Term
First Claim
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1. In a electrosurgical generator including means for supplying a surgical signal at a predetermined high frequency to perform a surgical procedure, and means for regulating the power content of the surtgical signal, and an improved feedback means for controlling the power regulating means comprising:

  • means for creating a current delivered signal related to the current of the surgical signal;

    means for establishing a current limit signal;

    voltage limit means receptive of the current limit signal and the current delivered signal and operative for supplying a first signal corresponding to one of either the current limit signal or the current delivered signal, said voltage limit means operatively supplying the current delivered signal as the first signal when the current delivered signal is greater than the current limit signal and operatively supplying the current limit signal as the first signal when the current delivered signal is less than the current limit signal;

    means for creating a voltage delivered siganl related to the voltage of the surgical signal;

    means for establishing a voltage limit signal;

    curret limit means receptive of the voltage limit signal and voltage delivered signal and operative for supplying a second signal corresponding to one of either the voltage limit signal or the voltage delivered signal, said current limit means operatively supplying the voltage delivered signal as the second signal when the voltage delivered signal is greater than the voltage limit signal and operatively supplying the voltage limit signal as the second signal when the voltage delivered signal is less than the voltage limit signal;

    multiplier means receptive of the first and second signals and operative for multiplying the first and second signals to create a delivered power signal which is the product of the first and second signals; and

    means receptive of the delivered power signal and operative for controlling the power regulation means of said generator to regulate the power content of the surgical signal in response to the power delivered signal.

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