A first jaw and a second jaw pivotally attached to the first jaw for pivotal movement between a fully open position and a fully closed position by an axially movable closing member. Surgical instruments, including surgical end effectors that have. The instrument was configured to add additional closing motion to the second jaw as the axially movable launcher was moved from the most distal position within the first end effector jaw to the most distal position. It further includes an axially movable launching member with one jaw engaging mechanism. When the closing member is in the starting position and the axially movable launching member is in the most recent position, the distal end of the closing member is located distal to the distal end of at least one jaw engagement mechanism. To do.第１のジョーと、軸方向に可動な閉鎖部材によって完全開放位置と完全閉鎖位置との間で枢動移動するように第１のジョーに枢動可能に取り付けられた第２のジョーと、を有する、外科用エンドエフェクタを含む、外科用器具。器具は、軸方向に移動可能な発射部材が第１のエンドエフェクタジョー内の最近位位置から最遠位位置に動かされる際に第２のジョーに更なる閉鎖運動を加えるように構成された少なくとも１つのジョー係合機構を有する、軸方向に可動な発射部材を更に含む。閉鎖部材が始点位置にあり、軸方向に可動な発射部材が最近位位置にある場合、閉鎖部材の遠位端は、少なくとも１つのジョー係合機構の遠位端に対して遠位側に位置する。
