A high-frequency incision tool has a flexible sheath which is adapted to be inserted into the body cavity along with an endoscope. A suction port is formed at the distal end of the sheath. A wire is inserted into the sheath and a part of the wire is exposed from the sheath to form an incision section....http://www.google.com/patents/US4724836?utm_source=gb-gplus-sharePatent US4724836 - High-frequency incision tool
