Circular surgical stapler end effector having staple line alignment feature
A surgical stapler for creating an anastomosis includes a stapling head assembly having a deck member that incorporates an alignment feature. The alignment feature aligns with a transection staple line prior to creating the anastomosis. In some versions the alignment feature is a groove formed in a surface of the deck member. The surgical stapler may include an anvil with a complementary stepped feature to the alignment feature of the deck member. Various surgical staplers with an alignment feature can be oval shaped, circular shaped, or dog-bone shaped. In some versions different staple geometries are used along the deck member incorporating the alignment feature.
1. An apparatus for creating an anastomosis between two lumens, comprising:
(a) a body;
(b) a shaft extending distally from the body;
(c) a stapling head assembly positioned at a distal end of the shaft, wherein the stapling head assembly includes:
(i) an annular deck member defining a dog-bone shape, wherein the annular deck member includes:
(A) a deck surface configured to contact a tissue defining a select one of the two lumens, wherein the deck surface includes a width that extends transversely to a central axis of the stapling head assembly, wherein the deck surface of the deck member comprises a first portion and a second portion,
(B) an annular array of staple openings formed through the deck surface, and
(C) an alignment feature configured to align the deck surface of the deck member with a linear feature of the tissue defining the select one of the two lumens, wherein the alignment feature extends the width of the deck surface and transversely to the central axis to thereby define a plane extending along the width, wherein the alignment feature separates the first portion and the second portion;
(ii) a staple driver operable to drive staples through the annular array of staple openings; and
(d) an anvil configured to deform the staples driven by the staple driver to form an annular staple pattern configured to connect the two lumens.
2. The apparatus of claim 1 , wherein the annular deck member further comprises a circular shape.
3. The apparatus of claim 1 , wherein the annular deck member further comprises an oval shape.
4. The apparatus of claim 1 , wherein the dog-bone shape defines a longitudinal axis and the alignment feature is oriented along the longitudinal axis.
5. The apparatus of claim 1 , wherein the linear feature of the tissue comprises a staple line transecting the select one of the two lumens closing an open end of the select one of the two lumens.
6. The apparatus of claim 1 , wherein the alignment feature is defined by a portion of the deck surface.
7. The apparatus of claim 1 , wherein the alignment feature comprises a groove in the deck surface.
8. The apparatus of claim 1 , wherein the alignment feature is oriented orthogonal to a longitudinal axis defined by the body.
9. The apparatus of claim 1 , wherein the anvil comprises a stapling surface, wherein a distance between the stapling surface of the anvil and the deck surface of the deck member of the stapling head assembly defines a gap, wherein the gap is non-uniform due to the presence of the alignment feature.
10. The apparatus of claim 9 , wherein the gap at the alignment feature is larger than the gap elsewhere and is consistent across the width.
11. The apparatus of claim 1 , wherein the anvil comprises a complementary feature to the alignment feature.
12. The apparatus of claim 11 , wherein the complementary feature of the anvil comprises a stepped feature and the alignment feature of the deck member comprises a groove in the deck surface.
13. The apparatus of claim 1 , wherein the first portion and the second portion are each planar.
14. The apparatus of claim 1 , wherein the first portion and the second portion are coplanar, and the alignment feature is non-coplanar with the first portion and the second portion.
15. An apparatus for creating an anastomosis between two lumens, comprising:
(a) a body;
(b) a shaft extending distally from the body and including a longitudinal axis;
(c) a stapling head assembly positioned at a distal end of the shaft, wherein the stapling head assembly includes:
(i) an annular deck member defining a dog-bone shape, wherein the annular deck member includes:
(A) a deck surface configured to contact a tissue defining a select one of the two lumens, wherein the deck surface comprises a first portion, a second portion, and a third portion, wherein the third portion defines an alignment feature separating the first and the second portions, wherein the alignment feature is configured to align the deck surface of the deck member with a linear feature of the tissue defining the select one of the two lumens,
(B) an annular array of staple openings formed through the deck surface, wherein the annular array of staple openings includes a first region of staple openings located on the first and the second portions of the deck surface, and a second region of staple openings located on the third portion of the deck surface,
(C) a first plurality of staples configured to travel through the first region of staple openings of the annular array of staple openings, and
(D) a second plurality of staples configured to travel through the second region of staple openings of the annular array of staple openings, wherein the second plurality of staples differ in configuration from the first plurality of staples; and
(ii) a staple driver operable to drive the first and the second pluralities of staples through the annular array of staple openings; and
(d) an anvil actuatable relative to the stapling head assembly between an open position and a closed position and configured to deform the staples driven by the staple driver to form an annular staple pattern configured to connect the two lumens, wherein in each of the open and closed positions a longitudinal distance between the anvil and the third portion is different than a longitudinal distance between the anvil and the first portion, wherein the longitudinal distance between the anvil and the third portion is consistent along a length of the third portion.
16. The apparatus of claim 15 , wherein the second plurality of staples comprises a different staple leg length or staple wire diameter compared to the first plurality of staples.
17. The apparatus of claim 15 , wherein the second plurality of staples comprise a different full height form than the first plurality of staples.
18. An apparatus for creating an anastomosis between two lumens, comprising:
(a) a body;
(b) a shaft extending distally from the body;
(c) a stapling head assembly positioned at a distal end of the shaft, wherein the stapling head assembly includes:
(i) an annular deck member defining a dog-bone shape, wherein the annular deck member includes:
(A) a deck surface configured to contact a tissue defining a select one of the two lumens,
(B) an annular array of staple openings formed through the deck surface, and
(C) an alignment feature configured to align the deck surface of the deck member with a linear fastening feature of the tissue defining the select one of the two lumens; and
(ii) a staple driver operable to drive staples through the annular array of staple openings; and
(d) an anvil configured to deform the staples driven by the staple driver to form an annular staple pattern configured to connect the two lumens, wherein the anvil includes a step,
wherein the anvil is configured to transition between an open configuration and a closed configuration, wherein the anvil in the closed configuration is configured to compress the tissue against the annular deck member, wherein a gap between the step of the anvil and the alignment feature is configured to receive the linear fastening feature and is sized to accommodate a secured staple of the linear fastening feature while the anvil is in the closed configuration, wherein a staple opening opens into the gap.