PROBLEM TO BE SOLVED: To provide a medical device that is superior in operability without impairing the deliverability of an in vivo gripper, and can collect a living tissue existing in a wall of a biological organ.SOLUTION: A medical device includes a plurality of joint members 60 juxtaposed in an axial direction. The device has: a long member 40 constituting a first configuration bendable in the direction intersecting with the axial direction in the state where the joint members are juxtaposed at intervals in the axial direction, and constituting a second configuration with the stiffness by that the distance between the joint members is narrowed more than the first configuration in the axial direction a gripper 10 capable of gripping an object to be gripped and a first push-pull member 21 and a second push-pull member 22 movable in the axial direction of the long member. The long member can be switched into the first configuration enabling the bending operation and the second configuration with the stiffness, and can perform the opening and closing operation of the gripper, by operating the first push-pull member and the second push-pull member.COPYRIGHT: (C)2015,JPO&INPIT【課題】生体内における把持部の送達性を損なうことなく、かつ、生体器官の壁部内に存在する生体組織の採取を行うことが可能な操作性に優れる医療器具を提供する。【解決手段】医療器具は、軸方向に並置された複数の関節部材60を備え、当該関節部材同士が軸方向に間隔を空けて並置された状態では軸方向と交差する方向に湾曲可能な第1の形態を構成し、第1の形態よりも当該関節部材間の距離が軸方向に狭められることにより、剛直性を備えた第2の形態を構成する長尺部材40と、把持対象物を把持可能な把持部10と、長尺部材の軸方向に沿って移動可能な第1押し引き部材21および第2押し引き部材22と、を有しており、第1押し引き部材および第2押し引き部材を操作することにより、湾曲動作が可能な第1の形態と剛直性を備える第2の形態とに長尺部材を切り替えることができ、かつ、把持部の開閉動作を行うことができる。【選択図】図6
