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:
Jul. 25, 1989
Filed:
Aug. 08, 1988
Peter Stasz, Moundsview, MN (US);
Jeffrey J Solberg, Northfield, MN (US);
Scott R Grabinger, Maple Grove, MN (US);
Everest Medical Corporation, Brooklyn Center, MN (US);
Abstract
An electrosurgical blade having a silicon nitride ceramic substrate having a beveled working edge with first and second conductive metal traces adhered to opposed side surfaces of the substrate along the working edge so as to be closely spaced relative to one another across the thickness dimension of the beveled working edge. Further conductive traces are formed on opposed sides of the substrate along the other edge of the substrate. In use, when a high RF voltage is applied between the traces extending along the working edge and the surgical blade is brought into contact with tissue, the relatively high current density causes relatively high heating to take place, bursting the cells and creating an incision. When a high RF voltage is applied between the traces separated by the width dimension of the substrate, the current density therebetween is significantly lower but sufficient to create enough heat to dehydrate tissue and blood cells whereby coagulation is achieved. The use of silicon nitride as the substrate material enhances the performance of the blade by inhibiting thermal runaway.