Includes a first jaw and a second jaw connected to the first jaw to selectively pivot with respect to the first jaw between the fully open and fully closed positions. Surgical instruments. Selective closing direction for moving the axially movable closing member from the fully open position to the fully closed position and the axial opening direction for moving the second jaw from the fully closed position to the fully open position. Can be moved in the axial direction. The axially movable closing member includes a first jaw opening mechanism configured to apply a first jaw opening motion to the second jaw, with the second jaw opening mechanism axially from the first jaw opening mechanism. Separated in the direction, it is configured to apply a second jaw opening motion to the second jaw.第１のジョーと、完全開放位置と完全閉鎖位置との間で第１のジョーに対して選択的に枢動移動するように第１のジョーに連結された第２のジョーと、を含む、外科用器具。軸方向に可動な閉鎖部材を、第２のジョーを完全開放位置から完全閉鎖位置に動かす閉鎖方向と、第２のジョーを完全閉鎖位置から完全開放位置に動かす軸方向の開放方向とに選択的に軸方向に動かすことができる。軸方向に可動な閉鎖部材は第１のジョー開放運動を第２のジョーに加えるように構成された第１のジョー開口機構を含み、第２のジョー開口機構が第１のジョー開口機構から軸方向に離間され、第２のジョー開放運動を第２のジョーに加えるように構成されている。
