End effector and open linear stapler having the same

1 . 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,

wherein centroids of each first staple forming pocket of the first staple forming pocket pair are spaced a distance from each other and wherein centroids of each second staple forming pocket of the second staple forming pocket pair are spaced the distance from each other.

2 . The end effector of claim 1 , wherein the first staple forming pocket pairs and the second staple forming pocket pairs are arranged in a plurality of groups along the longitudinal axis (AX), respectively.

3 . The end effector of claim 1 , wherein the first staple forming pocket pair and the second staple forming pocket pair are at least partially overlapped along a transverse direction perpendicular to the longitudinal axis.

4 . The end effector of claim 1 , wherein the staple forming pocket has a straight edge and a curve edge opposite to the straight edge formed on the tissue engagement surface,

wherein the straight edge is parallel to the longitudinal axis, and the two staple forming pockets form the centrosymmetric structure with the respective curve edges thereof facing each other.

5 . The end effector of claim 4 , wherein the straight edge has a first end and a second end opposite to each other, and a distance between the straight edge and the curve edge is gradually reduced along a direction from the first end to the second end.

6 . The end effector of claim 5 , wherein the staple forming pocket has a bottom, and a distance from the bottom to the tissue engagement surface defines a depth of the staple forming pocket, the depth being gradually reduced along a direction from a middle portion of the staple forming pocket to the first end and to the second end respectively.

7 . The end effector of claim 6 , wherein the staple forming pocket comprises a first sidewall and a second sidewall extending between the tissue engagement surface and the bottom, the first sidewall forming the straight edge, the second sidewall forming the curve edge, and wherein at least one of the first sidewall and the second sidewall is configured to be inclined outwardly along a direction from the bottom to the tissue engagement surface.

8 . The end effector of claim 4 , wherein the two staple forming pockets which form the centrosymmetric structure are at least partially overlapped along a transverse direction perpendicular to the longitudinal axis.

9 . The end effector of claim 1 , wherein the movable jaw comprises a tissue retaining pin,

wherein the anvil of the stationary jaw comprises a tissue retaining pin hole corresponding to a position of the tissue retaining pin, and

wherein the tissue retaining pin hole is located at an upper end of the anvil along the longitudinal axis and offset in a transverse direction perpendicular to the longitudinal axis.

10 . The end effector of claim 1 , wherein the tissue engagement surface comprises at least two rows of staple forming pocket pairs along a transverse direction perpendicular to the longitudinal axis, and

wherein adjacent two rows of the staple forming pocket pairs define the longitudinal axis therebetween and are spaced apart by the longitudinal axis.

11 . The end effector of claim 1 , wherein two rows of staple forming pocket pairs located at two sides of the longitudinal axis have same numbers or different numbers of staple forming pockets.

12 . An open linear stapler, comprising an end effector of claim 1 .

13 . 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 longitudinal axis is straight,

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.

14 . The end effector of claim 13 , wherein the first staple forming pocket pairs and the second staple forming pocket pairs are arranged in a plurality of groups along the longitudinal axis (AX), respectively.

15 . The end effector of claim 13 , wherein the first staple forming pocket pair and the second staple forming pocket pair are at least partially overlapped along a transverse direction perpendicular to the longitudinal axis.

16 . The end effector of claim 13 , wherein the staple forming pocket has a straight edge and a curve edge opposite to the straight edge formed on the tissue engagement surface,

wherein the straight edge is parallel to the longitudinal axis, and the two staple forming pockets form the centrosymmetric structure with the respective curve edges thereof facing each other.

17 . The end effector of claim 16 , wherein the straight edge has a first end and a second end opposite to each other, and a distance between the straight edge and the curve edge is gradually reduced along a direction from the first end to the second end.

18 . 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,

wherein the movable jaw comprises a tissue retaining pin,

wherein the anvil of the stationary jaw comprises a tissue retaining pin hole corresponding to a position of the tissue retaining pin, and

wherein the tissue retaining pin hole is located at an upper end of the anvil along the longitudinal axis and offset in a transverse direction perpendicular to the longitudinal axis.

19 . The end effector of claim 18 , wherein the first staple forming pocket pair and the second staple forming pocket pair are mirror symmetrical with respect to a transverse axis orthogonal the longitudinal axis and staggered along the transverse axis.

20 . The end effector of claim 18 , wherein the tissue engagement surface comprises at least two rows of staple forming pocket pairs along a transverse direction perpendicular to the longitudinal axis, and

wherein adjacent two rows of the staple forming pocket pairs define the longitudinal axis therebetween and are spaced apart by the longitudinal axis.