Patent ID: 8551119

Claim:
A ligation apparatus comprising: a sheath including a distal end portion; a pressing member configured to be provided within the sheath and configured to be advanced and retreated relative to the sheath; a clip claw member provided at the pressing member, configured to open while the clip claw member is advanced relative to the distal end of the sheath, and configured to close while the clip claw member is retreated relative to 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 clip claw member and the distal end portion of the operation member to each other; an advance restricting mechanism including an advance restriction abutting portion provided at the pressing member, and an advance restricting stopper provided at the distal end portion of the sheath so as to restrict advance of the pressing member relative to the sheath at the distal end portion of the sheath to allow advance of the clip claw member relative to the pressing member according to advance of the operation member relative to the sheath; and a releasing mechanism configured to release restriction against the advance restricting mechanism, the releasing mechanism comprising a first engagement portion provided on the advance restriction abutting portion and a second engagement portion provided on the connection member engageable with respect to the first engagement portion, wherein, in accordance with the advance and retreat of the operation member relative to the pressing member, the second engagement portion is advanced relative to the pressing member and the first engagement portion to advance the clip claw member relative to the pressing member and the second engagement portion is retreated relative to the pressing member and the first engagement portion to transition the second engagement portion from an engaged state to a disengaged state and to engage the first engagement portion with the second engagement portion to transition the first engagement portion from an engaged state to a disengaged state thereby releasing restriction against the advance restricting mechanism to separate the pressing member from the distal end portion of the sheath.