Patent ID: 8690899

Claim:
A ligation apparatus comprising: a sheath including a distal end portion and a central axis; a pressing member configured to engage with the distal end portion of the sheath and including a distal end and a proximal end; a clip claw member which is provided at the pressing member, which is configured to be advanced and retreated relative to the pressing member and which includes relatively openable and closable ends protruding from the distal end of the pressing member; an operation member inserted through the sheath, configured to be advanced and retreated relative to the sheath and including a distal end portion; a connection member connecting the distal end portion of the operation member and the clip claw member to each other; and an elastic member provided between the distal end and the proximal end of the pressing member configured to elastically deform based on the movement of an advance and a retreat of the elastic member along the central axis and configured to advance the clip claw member relative to the pressing member, the elastic member energizing the clip claw member so as to advance the clip claw member by an elastic deformation and so as to open the openable and closable ends of the clip claw member by an elastic force thereof, wherein the elastic member is provided separately from the clip claw member, wherein: the ligation apparatus is capable of re-grasping a living tissue a plurality of times at the openable and closable ends of the clip claw member, the ligation apparatus grasping living tissue by the clip claw member pulling in the pressing member to resist energizing force of the elastic member so as to close the openable and closable ends of the clip claw member when the operation member and the connection member are pulled backwards relative to the pressing member along the central axis of the sheath, and the ligation apparatus after grasping the living tissue by the openable and closable ends of the clip claw member, releasing the grasp of the living tissue with the clip claw member opening the openable and closable ends of the clip claw member protruded relative to the pressing member by an energizing force of the elastic member exerted when the pulling of the operation member and the connection member relative to the pressing member is released.