1989-01-23
1992-03-31
Coven, Edward M.
Surgery
Truss
Pad
128804, 600 10, A61B 1736
Patent
active
050998404
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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Goble Colin C. O.
Goble Nigel M.
Coven Edward M.
Harrison Jessica J.
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