System and method for voltage and current sensing
First Claim
1. An electrosurgical system, comprising:
- a radio frequency output stage configured to output a radio frequency waveform having a current and a voltage;
a current sensor including a Rogowski coil coupled to the output stage and configured to output a first differentiated signal corresponding to the current of the radio frequency waveform;
a first conditioning circuit including;
a first resistor divider;
a first single-ended amplifier configured to convert the first differentiated signal to a first single-ended signal;
a first bandpass filter; and
a first integrator coupled to the Rogowski coil and configured to integrate the first single-ended signal to output a processed current signal proportional to the current;
a voltage sensor including a capacitive divider coupled to the output stage and configured to output a second differentiated signal corresponding to the voltage of the radio frequency waveform;
a second conditioning circuit including;
a second resistor divider;
a second single-ended amplifier configured to convert the second differentiated signal to a second single-ended single;
a second bandpass filter; and
a second integrator coupled to the capacitive divider and configured to integrate the second single-ended signal to output a processed voltage signal proportional to the voltage,wherein the first and second conditioning circuits have a matched gain and phase response; and
a controller coupled to the first and second conditioning circuits and configured to adjust the radio frequency waveform output by the output stage based on at least one of the processed current signal or the processed voltage signal.
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Accused Products
Abstract
An electrosurgical system is disclosed. The system includes a radio frequency output stage configured to output at least one radio frequency waveform and a current sensor coupled to the output stage and configured to output a first differentiated signal corresponding to a current of the at least one radio frequency waveform, the current sensor coupled to a first conditioning circuit configured to integrate the first differentiated signal to output a processed current signal indicative of the current. The system further includes a voltage sensor coupled to the output stage and configured to output a second differentiated signal corresponding to a voltage of the at least one radio frequency waveform, the voltage sensor coupled to a second conditioning circuit configured to integrate the second differentiated signal to output a processed voltage signal indicative of the voltage, wherein the first and second conditioning circuits have a substantially similar bandpass and phase response.
57 Citations
19 Claims
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1. An electrosurgical system, comprising:
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a radio frequency output stage configured to output a radio frequency waveform having a current and a voltage; a current sensor including a Rogowski coil coupled to the output stage and configured to output a first differentiated signal corresponding to the current of the radio frequency waveform; a first conditioning circuit including; a first resistor divider; a first single-ended amplifier configured to convert the first differentiated signal to a first single-ended signal; a first bandpass filter; and a first integrator coupled to the Rogowski coil and configured to integrate the first single-ended signal to output a processed current signal proportional to the current; a voltage sensor including a capacitive divider coupled to the output stage and configured to output a second differentiated signal corresponding to the voltage of the radio frequency waveform; a second conditioning circuit including; a second resistor divider; a second single-ended amplifier configured to convert the second differentiated signal to a second single-ended single; a second bandpass filter; and a second integrator coupled to the capacitive divider and configured to integrate the second single-ended signal to output a processed voltage signal proportional to the voltage, wherein the first and second conditioning circuits have a matched gain and phase response; and a controller coupled to the first and second conditioning circuits and configured to adjust the radio frequency waveform output by the output stage based on at least one of the processed current signal or the processed voltage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 18)
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8. An electrosurgical system configured to output electrosurgical energy, comprising:
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a current sensor including a Rogowski coil coupled to an output stage and configured to output a first differentiated signal corresponding to a current of the electrosurgical energy; a first conditioning circuit including; a first resistor divider; a first single-ended amplifier configured to convert the first differentiated signal to a first single-ended signal; a first bandpass filter; and a first integrator coupled to the Rogowski coil and configured to integrate the first single-ended signal to output a processed current signal proportional to the current; a voltage sensor including a capacitive divider coupled to the output stage and configured to output a second differentiated signal corresponding to a voltage of the electrosurgical energy; a second conditioning circuit including; a second resistor divider; a second single-ended amplifier configured to convert the second differentiated signal to a second single-ended single; a second bandpass filter; and a second integrator coupled to the capacitive divider and configured to integrate the second single-ended signal to output a processed voltage signal proportional to the voltage, wherein the first and second conditioning circuits have a matched gain and phase response; and a controller coupled to the first and second conditioning circuits and configured to adjust the electrosurgical energy output by the output stage based on at least one of the processed current signal or the processed voltage signal. - View Dependent Claims (9, 10, 11, 12, 19)
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13. A method for detecting an energy property of an electrosurgical generator, comprising:
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detecting current passing through an active lead of an electrosurgical generator; outputting a first differentiated signal corresponding to the current; converting the first differentiated signal to a first single-ended signal at a first single-ended amplifier of a first conditioning circuit; integrating the first single-ended signal at a first integrator of the first conditioning circuit to output a processed current signal proportional to the current; delivering the processed current signal indicative of the current to a controller for adjusting electrosurgical energy output by the electrosurgical generator; detecting voltage between the active lead and a return lead of the electrosurgical generator; outputting a second differentiated signal corresponding to the voltage; converting the second differentiated signal to a second single-ended single at a single-ended amplifier of a second conditioning circuit; integrating the second single-ended signal at a second integrator of a second conditioning circuit to output a processed voltage signal proportional to the voltage, wherein the first and second conditioning circuits have a matched gain and phase response; and delivering the processed voltage signal indicative of the voltage to the controller for adjusting electrosurgical energy output by the electrosurgical generator. - View Dependent Claims (14, 15, 16, 17)
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Specification