PROBLEM TO BE SOLVED: To provide a high frequency treatment device which improves stability of behavior of a treatment part while securing operability of suction operation, sending operation of liquids, or the like through a forceps hole for increasing a degree of accuracy of a technique in the high frequency treatment device used by being inserted in the forceps hole of an endoscope.SOLUTION: A high frequency treatment device is equipped with a sheath part 30, and is used by being inserted in a forceps hole of an endoscope. A projection part 36 (a projection part 36a, a projection part 36b, a projection part 36c) is provided partially in a circumferential direction on an outer peripheral surface of the sheath part 30. An outer peripheral surface (a recessed part 34a, a recessed part 34b, a recessed part 34c) excluding the projection part 36 forms a flow passage in an axial direction of the sheath part 30.COPYRIGHT: (C)2016,JPO&INPIT【課題】内視鏡の鉗子孔に挿通されて用いられる高周波処置具であって、鉗子孔を介した吸引操作や送液操作等の操作性を担保しつつ、処置部の挙動の安定性を向上させ、手技の精度を高める高周波処置具を提供する。【解決手段】高周波処置具はシース部30を備えており、内視鏡の鉗子孔に挿通されて用いられる。シース部30の外周面の周方向に部分的に凸部36(凸部36a、凸部36b、凸部36c)が設けられており、凸部36を除く外周面(凹部34a、凹部34b、凹部34c)がシース部30の軸方向への流路となっている。【選択図】図3
