US 6,309,386 B1 · Linear power control with PSK regulation

Abstract

It is an object of the present invention to provide a multi-channel radio frequency (RF) power delivery and control system for applying energy to multiple electrodes of an RF tissue heating device. In a first embodiment of the invention an apparatus for controlling electrical cross-talk in an electro-surgical instrument is disclosed. The apparatus includes: a driver, a first electrode, a second electrode, a ground for delivery of power to a surgical site, a power measurement circuit and a waveform generator. The power measurement circuit computes differences between a target power and an actual power delivered to the first electrode and the second electrode to establish an amount by which to increase and to decrease the power emanating from the first electrode and the second electrode. The waveform generator modulates a driver signal generated by the driver to increase and to decrease an integer number of whole wavelengths of the driver signal to produce a first oscillating signal measured at the first electrode and a second oscillating signal measured at the second electrode. In an alternate embodiment of the invention a method for power control in an electro-surgical instrument is disclosed.

Claims16

Dependent claims

A method for power control in an electro-surgical instrument including a driver, and at least one electrode and a ground for delivery of power in the form of a first oscillating signal to a surgical site, and the method for power control comprising the acts of:

computing differences between a target power and an actual power delivered to the at least one electrode to establish an amount by which to increase and to decrease the power in the first oscillating signal;
and
modulating a driver signal generated by the driver to increase and to decrease an integer number of whole wavelengths of the driver signal to produce the first oscillating signal, responsive to said computing act.

A method for power control in an electro-surgical instrument including a driver, a first electrode and a second electrode and a ground for delivery of power to a surgical site, and the method for power control comprising the acts of:

computing differences between a target power and an actual power delivered to the first electrode and the second electrode to establish an amount by which to increase and to decrease the power emanating from the first electrode and the second electrode;
and
modulating a driver signal generated by the driver to increase and to decrease an integer number of whole wavelengths of the driver signal to produce a first oscillating signal measured at the first electrode and a second oscillating signal measured at the second electrode, responsive to said computing act.

An apparatus for controlling electrical cross-talk in an electro-surgical instrument including a driver, a first electrode and a second electrode and a ground for delivery of power to a surgical site, and the apparatus for controlling cross-talk comprising:

a power measurement circuit for computing differences between a target power and an actual power delivered to the first electrode and the second electrode to establish an amount by which to increase and to decrease the power emanating from the first electrode and the second electrode;
and
a waveform generator coupled to a power drive and an isolation switchs the waveform generator modulating a driver signal generated by the power drive to increase and to decrease an integer number of whole wavelengths of the driver signal to produce a first oscillating signal measured at the first electrode and a second oscillating signal measured at the second electrode.

Dependencies are inferred from the claim text.

Linear power control with PSK regulation

Life of this patent

Linear power control with PSK regulation

Life of this patent

Abstract

Claims16