PROBLEM TO BE SOLVED: To provide a constant-pressure deformation device which is able to keep the inner pressure constant when folded back from the proximal end, and which is able to prevent surrounding interior walls from being adversely affected when used within a lumen.SOLUTION: A deformation inflator 11 and a constant-pressure inflator 12 are each structured in a bag shape with a gas held inside to allow inflation. In addition, the inside of the deformation inflator 11 and the inside of the constant-pressure inflator 12 are gas communicatable with each other. The deformation inflator 11 is configured to be deformable by operation means 13, which causes a portion of the deformation inflator 11 to move toward the inside of the deformation inflator 11. The constant-pressure inflator 12 is configured to be deformable such that when the deformation inflator 11 is deformed by the operation means 13, the sum of the interior volume of the deformation inflator 11 and the interior volume of constant-pressure inflator 12 remains unchanged.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】先端からの折り返し時に内圧を一定に保つことができ、管腔内で使用されたとき、周囲の内壁に悪影響を与えるのを防止することができる定圧変形装置を提供する。【解決手段】変形膨張体11および定圧用膨張体12が、内側に気体を入れて膨張するよう袋状に構成されている。また、変形膨張体11の内側と定圧用膨張体12の内側との間で互いに通気可能に構成されている。操作手段13が、変形膨張体11の一部を変形膨張体11の内側に向かって移動させて、変形膨張体11を変形可能に設けられている。定圧用膨張体12は、操作手段13により変形膨張体11を変形させたとき、変形膨張体11の内側の体積と定圧用膨張体12の内側の体積との和が変化しないよう、変形可能に設けられている。【選択図】図1
