Electrosurgical power control
First Claim
1. A method comprising:
- determining a value of a parameter, the parameter being associated with operation of an electrosurgical probe having a particular probe design;
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; and
delivering power 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 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
27 Claims
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1. A method comprising:
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determining a value of a parameter, the parameter being associated with operation of an electrosurgical probe having a particular probe design;
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; and
delivering power 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 comprising a pulsed profile including portions of low power and portions of high power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus comprising one or more computer readable media having instructions stored thereon and configured to result in at least the following:
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determining a value of a parameter associated with operation of an electrosurgical probe having a particular probe design;
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; and
delivering power 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 comprising a pulsed profile including portions of low power and portions of high power.
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23. 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 having a pulsed profile of low and high power.
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24. 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 having a pulsed profile of low and high power.
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25. A method comprising:
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determining whether a probe is delivering power in an ablative mode or a non-ablative mode;
delivering power according to a first algorithm when in the ablative mode;
delivering power according to a second algorithm different from the first algorithm when in the non-ablative mode, the second algorithm comprising a pulsed profile including portions of low power and portions of high power, the portions of high power being of sufficient durations to initiate the ablative mode and the durations being less than 250 milliseconds.
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26. 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 (27)
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Specification