System and method for output control of electrosurgical generator
First Claim
1. An electrosurgical system comprising:
- an electrosurgical generator adapted to supply electrosurgical energy to tissue, the generator including;
sensor circuitry adapted to continuously monitor tissue impedance to generate a variance impedance curve; and
a microprocessor programmed to calculate a slope of at least one segment of the variance impedance curve and a bubble factor representing rate of formation and absorption of bubbles within tissue to determine minimum tissue impedance and maximum tissue conductance; and
an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue;
wherein the microprocessor is further programmed to generate a moving time window to select the at least one segment of the variance impedance curve and divide the at least one segment into a first half and a second half, the first half representing a downward slope having a minimum impedance and the second half representing an upward slope advancing toward a maximum impedance.
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Accused Products
Abstract
An electrosurgical system and method are disclosed. The system includes an electrosurgical generator adapted to supply electrosurgical energy to tissue. The generator includes sensor circuitry adapted to continuously monitor tissue impedance to generate a variance impedance curve and a microprocessor adapted to calculate a slope of a segment of the variance impedance curve. The microprocessor also calculates a bubble factor that represents the rate of formation and absorption of bubbles within tissue to determine minimum tissue impedance and maximum tissue conductance. The system further includes an electrosurgical instrument which includes one or more active electrodes adapted to apply electrosurgical energy to tissue.
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Citations
15 Claims
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1. An electrosurgical system comprising:
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an electrosurgical generator adapted to supply electrosurgical energy to tissue, the generator including; sensor circuitry adapted to continuously monitor tissue impedance to generate a variance impedance curve; and a microprocessor programmed to calculate a slope of at least one segment of the variance impedance curve and a bubble factor representing rate of formation and absorption of bubbles within tissue to determine minimum tissue impedance and maximum tissue conductance; and an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue; wherein the microprocessor is further programmed to generate a moving time window to select the at least one segment of the variance impedance curve and divide the at least one segment into a first half and a second half, the first half representing a downward slope having a minimum impedance and the second half representing an upward slope advancing toward a maximum impedance. - View Dependent Claims (2, 3, 4, 5)
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6. A method for performing electrosurgical procedures:
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applying electrosurgical energy to tissue from an electrosurgical generator; continuously monitoring tissue impedance to generate a variance impedance curve; calculating a slope of at least one segment of the variance impedance curve; calculating a bubble factor representing rate of formation and absorption of bubbles within tissue to determine minimum tissue impedance and maximum tissue conductance; generating a moving time window to select the at least one segment of the variance impedance curve; and dividing the at least one segment into a first half and a second half the first half representing a downward slope having a minimum impedance and the second half representing an upward slope advancing toward a maximum impedance. - View Dependent Claims (7, 8, 9, 10)
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11. An electrosurgical generator adapted to supply electrosurgical energy to tissue comprising:
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sensor circuitry adapted to continuously monitor tissue impedance to generate a variance impedance curve; and a microprocessor programmed to calculate a slope of at least one segment of the variance impedance curve and a bubble factor representing rate of formation and absorption of bubbles within tissue to determine minimum tissue impedance and maximum tissue conductance; wherein the microprocessor is further programmed to generate a moving time window to select the at least one segment of the variance impedance curve and divide the at least one segment into a first half and a second half, the first half representing a downward slope having a minimum impedance and the second half representing an upward slope advancing toward a maximum impedance. - View Dependent Claims (12, 13, 14, 15)
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Specification