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US 8,262,652 B2Granted
Imaginary impedance process monitoring and intelligent shut-off
AssigneeTyco Healthcare Group LP
InventorRonald J. Podhajsky
Life of this patent
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Abstract
An electrosurgical generator for supplying electrosurgical energy to tissue is disclosed. The generator includes sensor circuitry configured to measure an imaginary impedance and/or a rate of change of the imaginary impedance of tissue. The generator also includes a controller configured to regulate output of the electrosurgical generator based on the measured imaginary impedance and/or the rate of change of the imaginary impedance.
Claims4
An electrosurgical generator for supplying electrosurgical energy to tissue, comprising:
- sensor circuitry configured to measure at least one of an imaginary impedance and a rate of change of the imaginary impedance of tissue;
- and
- a controller configured to regulate output of the electrosurgical generator based on the at least one of the imaginary impedance and the rate of change of the imaginary impedance:
- to continue outputting the electrosurgical energy when the rate of change of the imaginary impedance is above a first predetermined threshold;
- to discontinue output of the electrosurgical energy when the rate of change of the imaginary impedance is below a second predetermined threshold;
- and
- to commence termination of the electrosurgical energy when the rate of change of the imaginary impedance is between the first and second predetermined thresholds for a duration of a predetermined time delay.
4 more elements
Dependencies are inferred from the claim text.