An electrosurgical apparatus comprises an HF generator and an HF instrument, the HF instrument having a first switch and a second switch, the first switch being assigned a first operating state, and the second switch being assigned a second operating state of the HF generator, the first switch and the...http://www.google.se/patents/US7115121?utm_source=gb-gplus-sharePatent US7115121 - Electrosurgical apparatus
