Surgical generator for ultrasonic and electrosurgical devices

摘要

In accordance with various embodiments, methods for controlling electrical power provided to tissue via a surgical device may comprise providing a drive signal. A power of the drive signal may be proportional to a power provided to the tissue via the surgical device. The methods may also comprise periodically receiving indications of an impedance of the tissue and applying a first composite power curve to the tissue, wherein applying the first composite power curve to the tissue comprises. Applying the first composite power curve to the tissue may comprise modulating a first predetermined number of first composite power curve pulses on the drive signal; and for each of the first composite power curve pulses, determining a pulse power and a pulse width according to a first function of the impedance of the tissue The methods may also comprise applying a second composite power curve to the tissue. Applying the second composite power curve to the tissue may comprise modulating at least one second composite power curve pulse on the drive signal; and for each of the at least one second composite power curve pulses, determining a pulse power and a pulse width according to a second function of the impedance of the tissue.

主权项

1. A method for controlling power provided to tissue via a surgical device, the method comprising:
providing a pulsed drive signal, wherein a power of the drive signal is proportional to a power provided to the tissue via the surgical device; periodically receiving indications of an impedance of the tissue; applying a first composite load curve to the tissue, wherein applying the first composite load curve to the tissue comprises:
modulating a first predetermined number of first composite load curve pulses on the drive signal; andfor each of the first composite load curve pulses, determining a pulse power and a pulse width of the first composite load curve pulses modulated on the drive signal according to a first function of the impedance of the tissue, wherein the modulating comprises modulating the first predetermined number of first composite load curve pulses according to the determined pulse powers and pulse widths; and applying a second composite load curve to the tissue, wherein applying the second composite load curve to the tissue comprises:
modulating at least one second composite load curve pulse on the drive signal; andfor each of the at least one second composite load curve pulses, determining a pulse power and a pulse width according to a second function of the impedance of the tissue.