PROBLEM TO BE SOLVED: To provide a high-frequency treatment instrument for endoscopes capable of safely incising an intended site by accurately directing an elongate electrode exposure portion equivalent to the cutting edge of a tip electrode to a targeting incision object position, having a simple mechanism and preventing easy occurrence of malfunction.SOLUTION: The tip electrode 2 is formed of a pair of spring wire rods 20 disposed in an inverse-tapered shape, an electric insulating coating 25 is applied to the surfaces of the pair of spring wire rods 20 which are opened/closed by the elasticity of themselves with extracting/retracting operations relative to the distal end of a flexible sheath 1, and the electrode exposure portion 26 non-covered with the electric insulating coating 25 is formed elongate in axial direction at least in one of the surface in closing-direction and the surface in opening-direction of at least one of the pair of spring wire rods 20.COPYRIGHT: (C)2009,JPO&INPIT【課題】先端電極の刃先に相当する幅狭の電極露出部を目標とする切開対象位置に正確に臨ませて所望通りの部位を安全に切開することができ、また、シンプルな機構で作動不良の発生し難い内視鏡用高周波処置具を提供すること。【解決手段】先端電極2が先広がりの形状に配置された一対のばね線材20で形成されて、可撓性シース1の先端内に出入りする動作に伴ってそれ自体の弾性により開閉するその一対のばね線材20の表面に電気絶縁性コーティング25が施されると共に、一対のばね線材20のうちの少なくとも一方の閉じ方向面と開き方向面の少なくとも一方に、電気絶縁性コーティング25が被覆されていない電極露出部26が軸方向に細長く形成されている。【選択図】図1
