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Electrosurgical generator

  • US 4,429,694 A
  • Filed: 07/06/1981
  • Issued: 02/07/1984
  • Est. Priority Date: 07/06/1981
  • Status: Expired due to Term
First Claim
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1. An electrosurgical generator for performing surgical operations on a tissue mass comprising:

  • an active electrode,a return electrode,means for generating a damped oscillatory open circuit output voltage waveform across said electrodes, said waveform being substantially of the form e-ζ

    ω

    .sbsp.nt sin (ω

    n

    1-ζ

    2 t+φ

    ), where e is the base of the natural logarithm, ω

    n is the undamped, natural frequency, ζ

    is the damping factor and is equal to or less than 0.038, but greater than 0 and φ

    is a phase angle, said generating means generating a loaded output voltage waveform across said electrodes after an electrical arc forms between said tissue mass and said active electrode, said loaded waveform being substantially of the form e-ζ

    ω

    .sbsp.nt sin (ω

    n

    1-ζ

    2 t+φ

    ), where e is the base of the natural logarithm, ω

    n is the undamped, natural frequency, ζ

    is the damping factor and is substantially greater than 0.038.

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