Systems and methods for measuring tissue impedance through an electrosurgical cable
First Claim
1. An electrosurgical generator that delivers electrosurgical energy to tissue via a cable and an instrument coupled to the cable, the electrosurgical generator comprising:
- an output stage coupled to an electrical energy source and configured to generate electrosurgical energy;
a plurality of sensors configured to sense a voltage waveform and a current waveform of the generated electrosurgical energy; and
a controller configured to control the output stage, the controller comprising;
a calculator configured to calculate a real part of an impedance based on the sensed voltage and current waveforms;
an estimator configured to estimate a resistance of the tissue using a solution to a quadratic equation that is a function of a real part of the impedance; and
a control signal generator configured to generate a control signal based on the estimated resistance of the tissue,wherein the solution to the quadratic equation is
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Abstract
The electrosurgical systems and methods of the present disclosure include a tissue resistance measurement system that compensates for capacitive parasitics in a cable connecting an electrosurgical generator to and electrosurgical cable to estimate the real resistance of a tissue load. The electrosurgical generator includes an output stage coupled to an electrical energy source and generates electrosurgical energy. The electrosurgical generator includes a plurality of sensors sensing a voltage and current of the electrosurgical energy and a controller controlling the output stage. The controller includes a calculator that calculates a real part of an impedance based on the sensed voltage and current, an estimator that estimates a resistance of the tissue using a solution to a quadratic equation that is a function of the real part of the impedance, and a control signal generator configured to generate a control signal for the output stage based on the resistance of the tissue.
1222 Citations
20 Claims
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1. An electrosurgical generator that delivers electrosurgical energy to tissue via a cable and an instrument coupled to the cable, the electrosurgical generator comprising:
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an output stage coupled to an electrical energy source and configured to generate electrosurgical energy; a plurality of sensors configured to sense a voltage waveform and a current waveform of the generated electrosurgical energy; and a controller configured to control the output stage, the controller comprising; a calculator configured to calculate a real part of an impedance based on the sensed voltage and current waveforms; an estimator configured to estimate a resistance of the tissue using a solution to a quadratic equation that is a function of a real part of the impedance; and a control signal generator configured to generate a control signal based on the estimated resistance of the tissue, wherein the solution to the quadratic equation is - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling an electrosurgical generator that delivers electrosurgical energy to tissue via a cable and an instrument coupled to the cable, the method comprising:
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sensing a voltage waveform and a current waveform of the generated electrosurgical energy; calculating a real part of an impedance based on the sensed voltage and current waveforms; estimating a resistance of the tissue using a solution to a quadratic equation that is a function of a real part of the impedance; and generating a control signal to control the output from an output stage of the electrosurgical generator based on the estimated resistance of the tissue, wherein the solution to the quadratic equation is - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A non-transitory computer-readable storage medium storing a program that, when executed a processor, performs a method of controlling an electrosurgical generator that delivers electrosurgical energy to tissue via a cable and an instrument coupled to the cable, the method comprising:
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sensing a voltage waveform and a current waveform of the generated electrosurgical energy; calculating a real part of an impedance based on the sensed voltage and current waveforms; estimating a resistance of the tissue using a solution to a quadratic equation that is a function of a real part of the impedance; and generating a control signal to control the output from an output stage of the electrosurgical generator based on the estimated resistance of the tissue, wherein the solution to the quadratic equation is
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Specification