Electrosurgical power control
First Claim
1. A method comprising:
- determining a rate at which a temperature of a probe approaches a range of temperatures that has been predetermined to enable shrinkage of tissue;
determining whether the rate is within a range of rates that has been predetermined to indicate that a distance from the probe to tissue is small enough to enable shrinkage of tissue at a temperature in the range of temperatures; and
delivering power to the probe according to an algorithm based upon a determination that the rate is outside the range of rates, the algorithm comprising a pulsed profile including portions of low power and portions of high power.
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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.
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Citations
20 Claims
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1. A method comprising:
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determining a rate at which a temperature of a probe approaches a range of temperatures that has been predetermined to enable shrinkage of tissue; determining whether the rate is within a range of rates that has been predetermined to indicate that a distance from the probe to tissue is small enough to enable shrinkage of tissue at a temperature in the range of temperatures; and delivering power to the probe according to an algorithm based upon a determination that the rate is outside the range of rates, the algorithm comprising a pulsed profile including portions of low power and portions of high power. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus comprising:
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one or more processors; and a computer-readable medium storing instructions executable by the one or more processors to perform operations comprising; determining a rate at which a temperature of a probe approaches a range of temperatures that has been predetermined to enable shrinkage of tissue; determining whether the rate is within a range of rates that has been predetermined to indicate that a distance from the probe to tissue is small enough to enable shrinkage of tissue at a temperature in the range of temperatures; and delivering power to the probe according to an algorithm based upon a determination that the rate is outside the range of rates, the algorithm comprising a pulsed profile including portions of low power and portions of high power. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification