Helical coil for diathermy apparatus

Details Helical coil for diathermy apparatus Helical coil for diathermy apparatus

A - Human Necessities

61

N

327/1, 326/4

A61N 1/40 (2006.01) A61N 5/00 (2006.01)

Patent

CA 1212424

ABSTRACT OF THE DISCLOSURE 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 coccal 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.

438101

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