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Signal generating device and method for producing coagulation electrosurgical current

  • US 3,963,030 A
  • Filed: 11/01/1974
  • Issued: 06/15/1976
  • Est. Priority Date: 04/16/1973
  • Status: Expired due to Term
First Claim
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1. An electrosurgical method for coagulating tissue comprising the steps ofgenerating a D.C. voltage;

  • generating a pulse train having a predetermined pulse repetition frequency;

    repetitively connecting said D.C. voltage across a tank circuit comprising at least a capacitor and a primary winding of a transformer, said capacitor and primary winding being in parallel connection and the resonant frequency of said tank circuit being substantially greater than said predetermined pulse repetition frequency, in response to each occurrence of a pulse of said pulse train to thereby store electrical energy in said tank circuit during each occurrence of said pulses;

    repetitively disconnecting said D.C. voltage from said tank circuit in response to each termination of a pulse of said pulse train so that the said electrical energy stored in said tank circuit is coupled through a secondary winding of said transformer as a burst of pulses of decaying amplitude each time one of said pulses of said pulse train terminates, the capacitance of said capacitor and the inductance of said primary winding being such that crest factor of the output signal from said secondary winding is about 5 to 10;

    applying said output signal to an electrosurgical instrument; and

    coagulating said tissue by positioning said instrument adjacent said tissue.

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