Diathermy apparatus

Details Diathermy apparatus Diathermy apparatus

1975-08-20

1978-01-24

Kamm, William E.

Surgery

Truss

Pad

A61N 140

Patent

active

040698270

ABSTRACT:
A diathermy apparatus includes a power oscillator for developing signals which are coupled to a patient by a tuned reactive coupling circuit. The magnitude of the oscillator signal is detected in the oscillator output circuit, and a corresponding control signal is developed. A reference signal is supplied by an output level selection circuit. The load imposed by the patient and the output circuit upon the power oscillator, and thus the magnitude of the oscillator signal, are maintained substantially constant by a servo control circuit. A motor driven variable impedance in the reactive coupling circuit is operated in response to differences between the control and reference signals.

REFERENCES:
patent: 2415799 (1947-02-01), Rigfel et al.
patent: 2752496 (1956-06-01), Martens
patent: 3127895 (1964-04-01), Kendall et al.
patent: 3543762 (1970-12-01), Kendall
patent: 3566877 (1971-03-01), Smith et al.

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