The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2023
Filed:
Sep. 27, 2018
Cilag Gmbh International, Zug, CH;
Amrita S. Sawhney, Pittsburgh, PA (US);
Stephen M. Leuck, Milford, OH (US);
Brian D. Black, Loveland, OH (US);
Eric M. Roberson, Lebanon, OH (US);
Cilag GmbH International, Zug, CH;
Abstract
A method of controlling the temperature of an ultrasonic blade includes applying a power level to an ultrasonic transducer to achieve a desired temperature at an ultrasonic blade coupled to the transducer via an ultrasonic waveguide, inferring a temperature of the blade based on a voltage V(t) signal and a current I(t) signal applied to the transducer, comparing the inferred temperature of the blade to a predetermined temperature; and adjusting the power level to the transducer based on the comparison. In some aspects, the method includes measuring a phase angle φ between the voltage V(t) and the current I(t) and inferring the temperature of the blade from the phase angle φ. In some aspects, the method includes measuring an impedance Z(t) equal to a ratio of the voltage V(t) to the current I(t) and inferring the temperature of the blade from the impedance Z(t).