US 2025/0025199 A1 · ELECTROSURGICAL GENERATOR AND METHOD FOR CONTROLLING AN ULTRASONIC TRANSDUCER OF AN ELECTROSURGICAL INSTRUMENT

Abstract

A method for controlling an ultrasonic transducer of an electrosurgical instrument, the ultrasonic transducer is driven by alternating electrical overall current signal, having a signal frequency, driving the overall current signal results in alternating electrical instrument voltage signal of transducer, depending on mechanical oscillation of transducer, the instrument voltage signal having transducer phase shift with respect to main current component of overall current signal depending on mechanical oscillations of transducer, ultrasonic transducer is having fluctuating mechanical resonance frequency, amplifier is controlled to provide electrical overall current signal and adjust signal frequency towards resonance frequency depending on transducer phase shift, and for determining transducer phase shift, calculating signal coefficients for main current component and instrument voltage signal, signal coefficients being representative for phase relationship of main current component or instrument voltage signal respectively with respect to common reference signal, and calculating from signal coefficients transducer phase shift.

Claims15

Dependent claims

1-14. (canceled)

A method for controlling an ultrasonic transducer of an electrosurgical instrument,

the ultrasonic transducer is driven by an alternating electrical overall current signal, having a signal frequency,
driving the overall current signal results in an alternating electrical instrument voltage signal of the transducer, depending on a mechanical oscillation of the transducer
the instrument voltage signal having a transducer phase shift with respect to a main current component of the overall current signal depending on the mechanical oscillations of the transducer,
the ultrasonic transducer is having a fluctuating mechanical resonance frequency,
an amplifier is controlled to provide the electrical overall current signal and adjust the signal frequency towards the resonance frequency depending on the transducer phase shift, and
for determining the transducer phase shift,
calculating signal coefficients for the main current component and the instrument voltage signal, the signal coefficients being representative for a phase relationship of the main current component or the instrument voltage signal respectively with respect to a common reference signal, and
calculating from the signal coefficients the transducer phase shift.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/779,788Filed 22 Jul 2024

Priority

20 Jul 2023

Published

23 Jan 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

A61B 17/320068
Surgical cutting instruments: using mechanical vibrations, e.g. ultrasonic
A61B 18/1445
Probes having pivoting end effectors, e.g. forceps: at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
A61B 18/1206
By passing a current through the tissue to be heated, e.g. high-frequency current: generators therefor
A61B 2017/00017
Surgical instruments, devices or methods: electrical control of surgical instruments

Electrosurgical generator and method for controlling an ultrasonic transducer of an electrosurgical instrument

Life of this patent

Electrosurgical generator and method for controlling an ultrasonic transducer of an electrosurgical instrument

Life of this patent

Abstract

Claims15