PROBLEM TO BE SOLVED: To provide a treatment device capable of suppressing an amount of medicine to be administered in a living body.SOLUTION: A treatment device including an inflatable closure balloon 2 disposed near a distal end of an elongate shaft 1 is inserted into a living body lumen, and the closure balloon 2 is inflated to close the adjacency of an affected area in the living body lumen filled with a water component W and to form a closed chamber 17 in the living body lumen. A water removal part absorbs the water component W in the closed chamber 17 via a semipermeable membrane 16 exposed to the interior of the closed chamber 17 so as to thicken a medical agent D being present in the closed chamber 17.COPYRIGHT: (C)2015,JPO&INPIT【課題】生体内に投与される薬剤量を抑制することができる治療用デバイスを提供する。【解決手段】細長いシャフト1の先端部近傍に拡張可能な封鎖用バルーン2が配置された治療用デバイスを生体管腔内に挿入して、水成分Wで満たされた生体管腔内の病変部付近を封鎖するように封鎖用バルーン2を拡張して生体管腔内に封鎖室17を形成し、封鎖室17内に露出する半透膜16を介して除水部が封鎖室17内の水成分Wを吸い取ることにより、封鎖室17内に存在する薬剤Dを濃縮する。【選択図】図3
