Automatic Control Circuit for Use in an Electrosurgical Generator
First Claim
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1. A system for controlling an output of an electrosurgical generator comprising:
- a drive circuit for generating an output, the output being responsive to a feedback signal and operatively coupled to at least one electrode of the electrosurgical generator;
at least one sensing circuit operatively coupled to the at least one electrode for generating a first signal corresponding to a value of a voltage waveform present on the at least one electrode and a second signal corresponding to a value of a current waveform present on the at least one electrode;
a processing circuit for receiving the first and second signals, wherein the processing circuit implements a polyphase demodulation and decimation filter for determining magnitudes and a power factor based on the voltage waveform and the current waveform;
a determining circuit in communication with the processing circuit for generating an output signal as a function of a phase difference between the voltage waveform and the current waveform and/or real power; and
a control circuit for generating a feedback signal, the feedback signal representative of a difference between a value of the output signal and a reference value, the feedback signal operatively coupled to the drive circuit.
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Abstract
An automatic control circuit for an electrosurgical generator is herein disclosed. The automatic control circuit includes voltage and current sensing circuits, a processing circuit, a dosage calculating circuit, and control circuit. Samples of the voltage and current outputs are supplied to the processing circuit and the dosage calculating circuit to generate a dosage output signal. The dosage output signal is compared to a reference signal to generate a feedback signal that controls a drive circuit.
78 Citations
13 Claims
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1. A system for controlling an output of an electrosurgical generator comprising:
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a drive circuit for generating an output, the output being responsive to a feedback signal and operatively coupled to at least one electrode of the electrosurgical generator; at least one sensing circuit operatively coupled to the at least one electrode for generating a first signal corresponding to a value of a voltage waveform present on the at least one electrode and a second signal corresponding to a value of a current waveform present on the at least one electrode; a processing circuit for receiving the first and second signals, wherein the processing circuit implements a polyphase demodulation and decimation filter for determining magnitudes and a power factor based on the voltage waveform and the current waveform; a determining circuit in communication with the processing circuit for generating an output signal as a function of a phase difference between the voltage waveform and the current waveform and/or real power; and a control circuit for generating a feedback signal, the feedback signal representative of a difference between a value of the output signal and a reference value, the feedback signal operatively coupled to the drive circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for controlling an output of an electrosurgical generator comprising:
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a drive circuit for generating an output, the output being responsive to a feedback signal from at least one electrode operatively coupled to the electrosurgical generator; at least one sensing circuit operatively coupled to the at least one electrode that generates a first signal corresponding to a value of a voltage waveform present on the at least one electrode and a second signal corresponding to a value of a current waveform present on the at least one electrode; a processing circuit for receiving the first and second signals, wherein the processing circuit implements a polyphase demodulation and decimation filter for determining magnitudes and a power factor based on the voltage waveform, the current waveform and/or real power; and a determining circuit in communication with the processing circuit that generates an output signal as a function of a phase difference between the voltage waveform and the current waveform and/or the real power. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification