Surgical instrument having self-regulating dielectric heating of

Details Surgical instrument having self-regulating dielectric heating of Surgical instrument having self-regulating dielectric heating of

1975-03-14

1980-06-17

Michell, Robert W.

Surgery

Truss

Pad

30140, 219233, A61B 1732, A61N 300

Patent

active

042078962

ABSTRACT:
The cutting edge of a scalpel blade is heated to an elevated preselected constant operating temperature for cutting tissue with simultaneous hemostasis by dielectric heating of the internal structure of the blade in the region along the cutting edge. Selective heating of regions of the cutting edge that are locally cooled by contact with tissues during surgical cutting is provided for by constructing the heating elements of the blade of ferroelectric materials that have a Curie point in the operating temperature range and that provide large increases in loss factor (the product of relative dielectric constant times the ratio of loss current to charging current) for temperature decrements below the Curie point.

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Murakami, K., "The Characteristics of Ferrite Cores with Low Curie Temperature", in IEEE Trans. on Magnetics, Jun. 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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