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...http://www.google.es/patents/US4850353?utm_source=gb-gplus-sharePatente US4850353 - Silicon nitride electrosurgical blade
