Helical coil for diathermy apparatus
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United States of America Patent
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-
Jul 9, 1985
Grant Date -
N/A
app pub date -
Jan 28, 1983
filing date -
Jan 28, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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