Surgery – Instruments – Electrical application
Patent
1990-02-07
1990-11-13
Cohen, Lee S.
Surgery
Instruments
Electrical application
128908, A61B 1739
Patent
active
049698850
ABSTRACT:
A high frequency AC electro-surgery apparatus is equipped with an automatic regulation loop for controlling the output voltage (U.sub.a) rather than the output power. An electrically isolating coupling in the form of an isolation transformer (5) is followed by a voltage converter (6) to provide DC voltage signal (a) proportional to a measure of the high frequency AC output voltage (U.sub.a). The DC voltage signal (a) is supplied to a regulating amplifier (7) to which a reference voltage signal (b) is supplied by a reference voltage source (8), to produce an output signal (c) that is furnished to the control input of an electronically controlled power supply (16). The latter controls the operating voltage (U.sub.b) for the amplifier (2) of the high frequency AC generator in such a manner that the output AC voltage (U.sub.a) at the output terminals (10, 11) corresponds to a desired value set by the reference voltage signal (b).
REFERENCES:
patent: 3601126 (1971-08-01), Estes
patent: 3897787 (1975-08-01), Ikuno et al.
patent: 4092986 (1978-06-01), Schneiderman
patent: 4102341 (1978-07-01), Ikuno et al.
patent: 4114623 (1978-09-01), Meinke et al.
patent: 4126137 (1978-11-01), Archibald
patent: 4271837 (1981-06-01), Schuler
patent: 4281373 (1981-07-01), Mabille
patent: 4658819 (1987-04-01), Harris et al.
patent: 4862889 (1989-09-01), Feucht
DIN/IEC 601 Part 2--2, Sep. 1984.
"Possibilities and Problems of the Standardization of High Frequency Power", in the collection Hochfrequenzdiathermie in der Endoskope, published by G. Lux and K. Semm, of Springer-Verlag, Berlin, Heidelberg, 1987.
Revue Generale De L'Electricite, No. 10, Oct., 1981, pp. 731-737.
Cohen Lee S.
Erbe Elektromedizin GmbH
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