Diathermy unit
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United States of America Patent
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-
Mar 31, 1992
Grant Date -
N/A
app pub date -
Jan 23, 1989
filing date -
Jan 20, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A diathermy unit has a power oscillator with a resonant circuit arranged to be coupled to the load represented by the tissue to be treated. The resonant circuit includes a capacitor for connection in series with the load such that the resonant frequency varies with the load resistance. The resulting self-tuning of the oscillator allows improved matching of the oscillator to the load with consequent improved efficiency, a feature especially useful for a battery-powered unit. Regulation of the output power of the unit makes use of a feedback loop including an analogue multiplier for receiving signals representative of the power of the output stage, the resulting product signal being used to control pulse width modulation of the oscillator.
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