treatment treatment portion of the treatment instrument for the living body tissue by adding energy to treat the living tissue of the subject, a pair of jaws, the energy applying portions capable of releasing energy to a living tissue to be treated , an insulating portion which is disposed having an electrical insulating property of blocking the flow of electricity to the jaw from the energy applying portions between said jaw and said energy applying portion, and the outer edge portion provided in the jaw, the side facing the other jaw of the jaw that energy applying portions are provided, the energy applying portions, said insulating portion and is formed cooperatively by the outer edge has been the treatment target by the energy emitted from the energy-emitting portion a channel of pouring the fluid generated from the living tissue, around the flow path disposed in the flow path so while securing an inlet for pouring a fluid covering at least a portion of the channel treatment target living tissue tissues and a support portion for supporting the biological tissue to prevent from entering into the flow path.処置対象の生体組織にエネルギを付加してその生体組織を処置するための処置具の処置部は、1対のジョーと、処置対象の生体組織にエネルギを放出可能なエネルギ放出部と、前記ジョーと前記エネルギ放出部との間に配設され前記エネルギ放出部から前記ジョーへの電気の流れを遮断する電気絶縁性を有する絶縁部と、前記ジョーに設けられた外縁部と、前記エネルギ放出部が設けられたジョーのうち他方のジョーに対向する側、前記エネルギ放出部、前記絶縁部及び前記外縁部により協働して形成され前記エネルギ放出部から放出されたエネルギにより処置対象の生体組織から生じた流体を流し込む流路と、前記流路に流体を流し込むための入口を確保しながら前記流路の少なくとも一部を覆うように前記流路に配置され処置対象の生体組織の周辺組織が前記流路に入り込むのを防止するように生体組織を支持する支持部とを有する。
