The retrieval device includes a sheath including a distal end and a proximal end, and an end effector at a distal end. At least a portion of the end effector is movable relative to the sheath between an extended state and a retracted state. The end effector includes a support member extending from the distal end of the sheath and a movable member extending from a distal end of the support member. The retrieval device includes a handle assembly at the proximal end of the sheath. The handle assembly includes an actuating member for transitioning the end effector between an extended state and a retracted state. The retrieval device includes a biasing member coupled to at least one of the actuating member and the sheath. The biasing member controls the force generated by the relative movement between the movable member and the support member and exerted by the movable member and the support member on the other.回収デバイスは、遠位端部及び近位端部を含むシースと、遠位端部でのエンドエフェクタとを含む。エンドエフェクタの少なくとも一部分は、延長状態と引込み状態の間でシースに対して移動可能である。エンドエフェクタは、シースの遠位端部から延びる支持部材と、支持部材の遠位端部から延びる可動部材を含む。回収デバイスは、シースの近位端部のところのハンドルアセンブリを含む。ハンドルアセンブリは、エンドエフェクタを延長状態と引込み状態の間で移行させるための作動部材を有する。回収デバイスは、作動部材及びシースのうちの少なくとも一方に結合された付勢部材を含む。付勢部材は、可動部材と支持部材の間の相対移動によって発生され且つ可動部材及び支持部材のうちの一方によって他方に及ぼされる力を制御する。
