Patent ID: 7867229

Claim:
A high-frequency treatment apparatus comprising: an electrode assembly electrically connected to a high-frequency generating unit for generating a high-frequency current, the assembly having at a distal end thereof a current-applying electrode for discharging the high-frequency current, a proximal end of the current-applying electrode being covered with a first insulating member; an insertion section receiving the electrode assembly such that the electrode assembly is movable in predetermined directions; a liquid supply unit for supplying an irrigation liquid to a vicinity of the current-applying electrode through the insertion section; and a second insulating member for covering a base part of the current-applying electrode, the base part being exposed from a distal end of the first insulating member, such that a predetermined area on an external surface of the current-applying electrode is covered in a continuous manner from the first insulating member, the second insulating member being a separated body from the first insulating member and made of a corrugated tube-shaped extendable member configured to change a range of the predetermined area to be covered.