Surgery – Instruments – Heat application
Patent
1997-03-13
1998-09-15
Cohen, Lee S.
Surgery
Instruments
Heat application
606 29, 219230, 219233, 219235, 219241, A61B 1739
Patent
active
058073922
ABSTRACT:
A surgical instrument having a resistively-heated heating component responsive to a power source for generating thermal excitation effective for cutting tissue and carrying out hemostasis. The surgical instrument includes a support assembly having two leg extensions connected in heat transfer relationship with the heating component. Two thermal transition regions are provided within the heating component and have extents effective to provide a decreasing temperature gradient and to restrict temperature levels exhibited at the support assembly. The support assembly is formed of high thermally conductive material and extends from the transition regions to an elongate shaft. This shaft is in heat transfer relationship with the support assembly and is formed from a high thermally conductive material. Together, the shaft and support assembly act as a heat buffer such that temperature levels exhibited at the support assembly are restricted to levels atraumatic to tissue while the heating component is heated to temperatures effective for cutting and hemostasis. A hand engagable handle connects to the shaft. The surgical instrument may be powered from existing, conventional electrosurgical generators having bipolar outputs, and, in this regard, additionally includes circuit components selected for effecting power transfer impedance matching between the electrosurgical generator and the heating component.
REFERENCES:
patent: 5445635 (1995-08-01), Denen et al.
patent: 5593406 (1997-01-01), Eggers et al.
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