Surgical generator for ultrasonic and electrosurgical devices

摘要

In accordance with various embodiments, methods to control electrical power provided to tissue via first and second electrodes may comprise providing a drive signal to the tissue via the first and second electrodes and modulating a power provided to the tissue via the drive signal based on a sensed tissue impedance according to a first power curve. The first power curve may define, for each of a plurality of potential sensed tissue impedances, a first corresponding power. The methods may also comprise monitoring a total energy provided to the tissue via the first and second electrodes. When the total energy reaches a first energy threshold, the methods may comprise determining whether an impedance of the tissue has reached a first impedance threshold. The methods may further comprise, conditioned upon the impedance of the tissue failing to reach the first impedance threshold, modulating the power provided to the tissue via the drive signal based on the sensed tissue impedance according to a second power curve. The second power curve may define, for each of the plurality of potential sensed tissue impedances, a second corresponding power.

主权项

1. A method for controlling power provided to tissue via first and second electrodes, the method comprising:
providing a drive signal to the tissue via the first and second electrodes; modulating the drive signal according to a first power curve, wherein the first power curve defines a first corresponding power level for each of a plurality of potential tissue impedances, and wherein the modulating comprises:
receiving an indication of a first tissue impedance value sensed between the first and second electrodes;determining the first corresponding power level defined by the first power curve for the first tissue impedance value; andmodifying the drive signal to provide the first corresponding power level defined by the first power curve for the first tissue impedance value to the tissue; monitoring a total energy provided to the tissue via the first and second electrodes; when the total energy reaches a first energy threshold, determining whether an impedance of the tissue has reached a first impedance threshold; and conditioned upon the impedance of the tissue failing to reach the first impedance threshold, modulating the drive signal according to a second power curve, wherein the second power curve defines a second corresponding power level for each of the plurality of potential tissue impedances, and wherein modulating the drive signal according to the second power curve comprises:
receiving an indication of a second tissue impedance value sensed between the first and second electrodes;determining the second corresponding power level defined by the second power curve for the second tissue impedance value; andmodifying the drive signal to provide the second corresponding power level defined by the second power curve for the second tissue impedance value.