Electrosurgical pencil with drag sensing capability Number:7,393,354 from the United States Patent and Trademark Office (PTO) owispatent

Title: Electrosurgical pencil with drag sensing capability

Abstract: An electrosurgical pencil (100) configured and adapted to support an electrocautery blade (116). A strain gauge (130) is affixed to the proximal, end of the electrocautery blade and measures the displacement of the blade as a result of resistance and drag acting on the blade. The electrosurgical pencil also includes a meter electrically connected to the strain gauge for monitoring either a change in voltage, a change in electrical current or a change in optical wavelength. The amount of blade displacement as measured by the strain gauge is available for display to the surgeon and/or as sensory input for a control circuit in the electrosurgical generator (118) that modulates the generator output waveform. The electrosurgical pencil further includes a control circuit electrically coupled between the electrocautery blade and the electrosurgical generator. The control circuit is configured and adapted to control power supplied to electrocautery blade based on the displacement measured by the strain gauge.

Patent Number: 7,393,354 Issued on 07/01/2008 to Buchman, II,   et al.

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Inventors:	Buchman, II; Thomas L. (Olathe, KS), Podhajsky; Ronald J. (Boulder, CO), Reschke; Arlan J. (Longmont, CO)
Assignee:	Sherwood Services AG (Schaffhausen, CH)
Appl. No.:	10/521,901
Filed:	July 23, 2003
PCT Filed:	July 23, 2003
PCT No.:	PCT/US03/22900
371(c)(1),(2),(4) Date:	October 05, 2005
PCT Pub. No.:	WO2004/010883
PCT Pub. Date:	February 05, 2004

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Related U.S. Patent Documents

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	Application Number	Filing Date	Patent Number	Issue Date
	60398620	Jul., 2002
	60413410	Sep., 2002

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Current U.S. Class:	606/42 ; 606/38; 606/45; 606/49
Current International Class:	A61B 18/14 (20060101)
Field of Search:	606/42,45

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References Cited [Referenced By]

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