Surgical instrument having self-regulated electrical proximity h

Details Surgical instrument having self-regulated electrical proximity h Surgical instrument having self-regulated electrical proximity h

1975-03-14

1978-05-30

Michell, Robert W.

Surgery

Truss

Pad

30140, 219233, A61B 1738

Patent

active

040918130

ABSTRACT:
The cutting edge of a scalpel blade is heated to a preselected constant temperature range by conduction of high frequency current through the blade of ferromagnetic material in a region thereof which is in close proximity to a conductor positioned along the cutting edge. Selective heating of regions of the cutting edge that are locally cooled by the tissue contact during surgical cutting is provided by constructing the blade of ferromagnetic materials that have a Curie point in the operating temperature range and that provide large increases in magnetic permeability for temperature decrements below the Curie point.

REFERENCES:
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patent: 1975437 (1934-10-01), Sorrel
patent: 2863036 (1958-12-01), Mitchell et al.
patent: 3024342 (1962-03-01), Birnbach et al.
patent: 3489884 (1970-01-01), Waselewski, Jr.
patent: 3515837 (1970-06-01), Ando
patent: 3524966 (1970-08-01), Ando
patent: 3768482 (1973-10-01), Shaw
Murakami, K., "The Characteristics of Ferrite Cores With Low Curie Temperature," in IEEE Trans. on Magnetics, June 1965, pp. 96-100.
Bennett; Edward, "The Proximity Effect: Its Application, etc.," in Trans. AIEE, 51:621 - 627, 1932.
Bennett; Edward, "Concentration of Heating Currents," in Electrical Engineering, Aug. 1932, pp. 559 - 562.

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