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AssigneeKarl Storz Endoscopy-America, Inc.
InventorsGerhard Flachenecker, Karl Fastenmeier, Heinz Lindenmeier
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A high-frequency generator having automatic power-control for use in high-frequency surgery. The frequency of a high-frequency generator is adjustable by electronic circuit brought by a control circuit to a value such that at the output of the power amplifier there is an optimal phase relation between output voltage and output current, i.e., generally a phase shift of zero. The signal necessary for the control of the output power is obtained from harmonic oscillations generated by the arc at the surgical probe. A harmonic-measuring device to obtain the harmonic oscillations generated by the arc at the surgical probe has a phase-controlled rectifier which is controlled by the oscillator of the high-frequency generator. A simple filter is used at the output of the power amplifier, and the measurement filter used before the harmonic-measuring device can either be completely eliminated or need only be very simple in construction. No complicated filter adjustment is necessary and the power generator operates under optimal conditions and exhibits enhanced operating reliability.
High-frequency generator with automatic power-control for high-frequency surgery, consisting of an oscillator for generating the generator frequency, a modulator for controlling the output amplitude, a power amplifier for generating the necessary high-frequency power, an output filter for suppressing frequencies other than the generator frequency of the high-frequency generator, and a harmonic-measuring device for measuring the amplitude of a selected harmonic frequency of the generator frequency in the output circuit of the high-frequency generator, said selected harmonic frequency being generated by the arc existing between the surgical probe and the tissue to be cut during the cutting process, characterized in that
Dependencies are inferred from the claim text.