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:
Dec. 18, 2012
Filed:
Mar. 25, 2011
Kevin W. Smith, Coral Gables, FL (US);
Thomas O. Bales, Jr., Coral Gables, FL (US);
Matthew A. Palmer, Miami, FL (US);
Derek Dee Deville, Coral Gables, FL (US);
Kevin W. Smith, Coral Gables, FL (US);
Thomas O. Bales, Jr., Coral Gables, FL (US);
Matthew A. Palmer, Miami, FL (US);
Derek Dee Deville, Coral Gables, FL (US);
Covidien AG, , CH;
Abstract
A method of maintaining constant movement of a cutting blade of an ultrasonic waveguide includes the steps of providing an ultrasonic transducer operable to convert a received motional voltage into a movement of a cutting blade of an ultrasonic waveguide, a motional feedback circuit connected in a parallel configuration with the ultrasonic transducer, and a variable power source operable to apply a first voltage between a set of connection points to the parallel configuration. A feedback voltage measured from the motional feedback circuit is determined and an output of the power source is varied based upon the measured feedback voltage to result in a substantially constant feedback voltage and, thereby, maintain a substantially constant rate of movement of the cutting blade across a variety of cutting loads.