Helical coil for diathermy apparatus

Details Helical coil for diathermy apparatus Helical coil for diathermy apparatus

1983-01-28

1985-07-09

Cohen, Lee S.

Surgery

Truss

Perineal

128419F, 219 1079, A61N 140

Patent

active

045275505

ABSTRACT:
A deep-heating diathermy apparatus consisting of a hollow tube adapted to receive a part of the body, or other dielectric material to be treated. An rf coil coaxially surrounds the tube and is driven by an rf generator. The total wire length of the coil is approximately 0.7 to 1.3 (depending on specific electrical properties and volume of the treated material) times the wavelength of a basic driving frequency provided by the generator. The output of the generator is supplied to the coil via a 50-ohm coaxial cable and a matching impedance. The coil may be driven by frequencies corresponding to integral multiples of one-half the basic wavelength, to enable shifting the heat focus volume along the coil axis from the normal centered location on the axis produced by full-wave excitation.

REFERENCES:
patent: 4066065 (1978-01-01), Kraus
patent: 4266532 (1981-05-01), Ryaby et al.

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