Electrosurgical power control
First Claim
1. A method comprising:
- making one or more determinations that an impedance value encountered by an electrosurgical probe is less than a threshold value; and
limiting tissue necrosis to less than 200 microns by delivering power to the electrosurgical probe, in response to at least one of the one or more determinations that the impedance is less than the threshold value, according to an algorithm that generates a signal with a pulsed power profile having low power portions and high power portions, wherein the high power portions have sufficient power to treat tissue in the desired manner.
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Accused Products
Abstract
A method and apparatus include determining a value of a parameter associated with operation of an electrosurgical probe having a particular probe design, and determining whether the value of the parameter is within a range of values that has been predetermined for the particular probe design to indicate that the probe is treating tissue in a desired manner. Power is delivered to the probe according to an algorithm based upon a determination that the value of the parameter is outside the range of values The algorithm delivers power in a pulsed profile including portions of low power and portions of high power. In one embodiment, the tissue treatment is ablation, the parameter is impedance, and the method limits tissue necrosis to less than 200 microns. In another embodiment, the tissue treatment is shrinkage, the parameter is temperature, and the method limits power delivery when the probe is not shrinking tissue.
206 Citations
14 Claims
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1. A method comprising:
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making one or more determinations that an impedance value encountered by an electrosurgical probe is less than a threshold value; and limiting tissue necrosis to less than 200 microns by delivering power to the electrosurgical probe, in response to at least one of the one or more determinations that the impedance is less than the threshold value, according to an algorithm that generates a signal with a pulsed power profile having low power portions and high power portions, wherein the high power portions have sufficient power to treat tissue in the desired manner. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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an electrosurgical probe configured to deliver power to tissue; and a control module configured to make one or more determinations that an impedance value encountered by the electrosurgical probe is less than a threshold value, and to limit tissue necrosis to less than 200 microns by delivering power to the electrosurgical probe in response to at least one of the one or more determinations that the impedance is less than the threshold value according to an algorithm that generates a signal with a pulsed power profile having low power portions and high power portions, wherein the high power portions have sufficient power to treat tissue in the desired manner. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification