US 10,945,753 B2Granted

System and method for controlling an ultrasonic tool

AssigneeStryker Corporation

InventorAdam Darwin Downey

Life of this patent

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Abstract

Systems (10) and methods (12) of controlling an ultrasonic surgical tool (20) with a console (22) are provided. A first drive signal (40) is applied to the ultrasonic surgical tool (20). A characteristic of a harmonic signal (44) resulting from application of the first drive signal (40) to the ultrasonic surgical tool (20) is acquired. A cancellation signal (70) is generated based on the characteristic of the harmonic signal (44). The first drive signal (40) and the cancellation signal (70) are combined to produce a second drive signal (80) that is sinusoidal. The second drive signal (80) is applied to the ultrasonic surgical tool (20) such that presence of the harmonic signal (44) resulting from application of the second drive signal (80) is reduced relative to presence of the harmonic signal (44) resulting from application of the first drive signal (40).

Claims18

Dependent claims

A method of controlling an ultrasonic surgical tool to reduce presence of a harmonic signal, the method comprising:

driving the ultrasonic surgical tool with a first drive signal;
increasing a mechanical current of the ultrasonic surgical tool;
determining whether the increased mechanical current causes the harmonic signal to reach a predetermined level;
responsive to determining that the increased mechanical current does not cause the harmonic signal to reach the predetermined level, continuing to drive the ultrasonic surgical tool with the first drive signal;
and
responsive to determining that the increased mechanical current causes the harmonic signal to reach the predetermined level:
acquiring characteristics of the harmonic signal resulting from the increased mechanical current, the characteristics being at least a frequency and a phase of the harmonic signal;
generating a cancellation signal with a frequency similar to the frequency of the harmonic signal and a phase that is shifted in relation to the phase of the harmonic signal;
combining the first drive signal and the cancellation signal to produce a second drive signal, the second drive signal being sinusoidal;
and
driving the ultrasonic surgical tool with the second drive signal such that presence of the harmonic signal resulting from driving the ultrasonic surgical tool with the second drive signal is reduced relative to presence of the harmonic signal resulting from driving the ultrasonic surgical tool with the first drive signal.

8 more elements

A console for controlling an ultrasonic surgical tool to reduce presence of a harmonic signal, the console comprising:

a controller configured to:
drive the ultrasonic surgical tool with a first drive signal;
increase a mechanical current of the ultrasonic surgical tool;
determine whether the increased mechanical current causes the harmonic signal to reach a predetermined level;
responsive to determining that the increased mechanical current does not cause the harmonic signal to reach the predetermined level, continue driving the ultrasonic surgical tool with the first drive signal;
and
responsive to determining that the increased mechanical current causes the harmonic signal to reach the predetermined level:
acquire characteristics of the harmonic signal resulting from the increased mechanical current, the characteristics being at least a frequency and a phase of the harmonic signal;
generate a cancellation signal with a frequency similar to the frequency of the harmonic signal and a phase that is shifted in relation to the phase of the harmonic signal;
combine the first drive signal and the cancellation signal to produce a second drive signal, the second drive signal being sinusoidal;
and
drive the ultrasonic surgical tool with the second drive signal such that presence of the harmonic signal resulting from application of the second drive signal is reduced relative to presence of the harmonic signal resulting from application of the first drive signal.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/742,361Filed 14 Jul 2016 · us provisional application
Priority: 15 Jul 2015
Published: US 2019/0083124 A121 Mar 2019
Granted: 16 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

A61B 17/320068
Surgical cutting instruments: using mechanical vibrations, e.g. ultrasonic
A61B 17/320092
Using mechanical vibrations, e.g. ultrasonic: with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw
A61B 2017/00017
Surgical instruments, devices or methods: electrical control of surgical instruments
A61B 2017/0003
Conductivity or impedance, e.g. of tissue: of parts of the instruments

Family

Application62/192,838Us provisional application · filed 15 Jul 2015
US 2019/0083124 A1Pre-grant publication · published 21 Mar 2019
US 10,945,753 B2This patent

From the US filing history. Foreign family members aren’t listed.

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