End effector and open linear stapler having the same

An end effector for a surgical instrument, the end effector comprising a substantially U-shaped stationary jaw located distally and a movable jaw movable relative to the stationary jaw to clamp tissue therebetween, the stationary jaw comprising an anvil at a surface opposite to the movable jaw, the movable jaw configured to receive a staple cartridge,

• wherein a surface of the anvil opposite to the movable jaw defines a tissue engagement surface,
• wherein the tissue engagement surface defines a longitudinal axis (AX) extending along a length direction of the anvil and is provided with a first staple forming pocket pair and a second staple forming pocket pair located at two sides of the longitudinal axis (AX),
• wherein the first staple forming pocket pair and the second staple forming pocket pair each are configured as a centrosymmetric structure formed by two staple forming pockets arranged along the longitudinal axis (AX), and the staple forming pocket has an asymmetric shape,
• wherein the first staple forming pocket pair and the second staple forming pocket pair are mirror symmetrical with respect to the longitudinal axis and staggered along the longitudinal axis.