A bipolar high frequency treatment tool includes a flexible insulating tube to be inserted through an accessory channel of the endoscope. The insulating tube has a pair of guide channels extending over the length thereof through which a pair of conductive wires is passed. An end effector is attached...http://www.google.co.uk/patents/US7326209?utm_source=gb-gplus-sharePatent US7326209 - Bipolar high frequency treatment tool for endoscope
