×

Resistively heated cutting and coagulating surgical instrument

  • US 5,807,392 A
  • Filed: 03/13/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 03/02/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A system for carrying out the thermal and hemostatic cutting of tissue, comprising:

  • an electrosurgical generator having bipolar output terminals exhibiting a load impedance to voltage characteristic, said generator exhibiting an operating frequency range characteristic at said output terminals within a range from about 350 KHz to 1 MHz;

    a surgical instrument including an electrical resistance heating component having a region responsive to an applied variable voltage and current to attain a temperature below Curie temperature effective to cut said tissue upon entering contact therewith and exhibiting a predetermined load impedance to said current;

    a support assembly coupled at a first end with said heating component for effecting its support and applying said current thereto, and having a shaft portion with electrical input terminals disposed at a second end;

    a hand engageable instrument handling portion having circuit components selected for effecting power transfer impedance matching within said range of frequencies between said bipolar output terminals and said heating component, said circuit components including a transformer having a primary to secondary turns ratio selected within a range of about 5;

    1 to about 10;

    1 and including a capacitor coupled with said transformer having a capacitance value selected with respect to said operating frequency range for optimizing power transfer to said heating component, said instrument handling portion having an instrument output coupled with said support assembly electrical input terminals, and having an instrument input; and

    an elongate cable connectable in electrical power transfer relationship between said bipolar output terminals of said electrosurgical generator and said instrument input of said instrument handling portion.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×