PROBLEM TO BE SOLVED: To provide a treatment device capable of performing treatment of blocking a lumen of a living body efficiently.SOLUTION: A treatment device 10B includes a shaft 18 which is hollow shape and can be inserted to a lumen of a living body, a flat part formation part 22 which has a pair of arms 26 retractable from a tip opening 18a of the shaft 18 and extendable in a width direction and which forms a flat part F in the lumen of a living body according to the extension of the pair of arms 26 in the lumen of a living body, and an electrode part (heating part) 40 which is provided in an extendable manner in a width direction of the flat part formation part 22, is extended according to the extension of the pair of arms 26 in the lumen of a living body, and heats a flat part F.COPYRIGHT: (C)2016,JPO&INPIT【課題】生体管腔を閉塞する処置を効率的に行うことができる治療デバイスを提供する。【解決手段】治療デバイス10Bは、生体管腔内に挿入可能な中空状のシャフト18と、シャフト18の先端開口18aから出没可能且つ幅方向に拡張可能な一対のアーム26を有し、一対のアーム26の生体管腔内での拡張に伴って生体管腔に扁平部分Fを形成する扁平形成部22と、扁平形成部22の幅方向に伸縮可能に設けられ、一対のアーム26の生体管腔内での拡張に伴って伸長し、扁平部分Fを加熱する電極部40(加熱部)と、を備える。【選択図】図7
