The catheter includes an inner tubular member having a fluid lumen and an outer surface defined therein. The outer surface defines a first end flow port and a second end flow port. The outer tubular member is movable proximally relative to the inner tubular member and has an inner surface. A first pressure chamber is defined between the outer surface and the inner surface and between the first end seal assembly and the first proximal seal assembly. A second pressure chamber is defined between the outer surface and the inner surface and between the second end seal assembly and the second proximal seal assembly. The fluid introduced into the fluid lumen pressurizes the first pressure chamber and the second pressure chamber to generate forces on the first proximal seal assembly and the second proximal seal assembly, respectively, and the outer tubular member is proximal. Push in the direction. [Selection] Figure 4Aカテーテルは、内部に画定された流体ルーメン及び外面を有する内側管状部材を備える。外面は、第１末端フローポート及び第２末端フローポートを画定する。外側管状部材は、内側管状部材に対して基端方向に移動可能にし、また内面を有する。第１圧力チャンバは、前記外面と前記内面との間、及び第１末端シール組立体と第１基端シール組立体との間に画定される。第２圧力チャンバは、前記外面と前記内面との間、及び第２末端シール組立体と第２基端シール組立体との間に画定される。流体ルーメンに導入される流体は第１圧力チャンバ及び第２圧力チャンバを加圧して、第１基端シール組立体及び第２基端シール組立体にそれぞれ力を発生し、外側管状部材を基端方向に押しやる。【選択図】図４Ａ
