Fastener cartridge assembly comprising an anvil and different staple heights

1. An end effector for a surgical fastening instrument, said end effector comprising:

a frame defining a longitudinal axis;

a first jaw, comprising:

a cartridge body;

a plurality of fastener cavities defined in said cartridge body;

an arcuate row of first fasteners removably stored in said cartridge body, wherein each said first fastener comprises:

a first base; and

a first pair of legs extending from said first base, wherein a first unfired height is defined by said first base and said first pair of legs; and

an arcuate row of second fasteners removably stored in said cartridge body, wherein said arcuate row of second fasteners extends alongside said arcuate row of first fasteners, and wherein each said second fastener comprises:

a second base; and

a second pair of legs extending from said second base, wherein a second unfired height is defined by said second base and said second pair of legs;

a second jaw comprising an arcuate anvil configured to deform said first fasteners to a first fired height and said second fasteners to a second fired height, wherein said first fired height is different than said second fired height, wherein said arcuate anvil comprises a tissue-compression surface extending transverse to said longitudinal axis, and wherein said tissue-compression surface defines a plurality of fastener-forming pockets;

first fastener-supporting surfaces configured to advance said first fasteners toward said arcuate anvil during a fastener firing stroke; and

second fastener-supporting surfaces configured to advance said second fasteners toward said arcuate anvil during said fastener firing stroke.

2. The end effector of claim 1 , wherein said first fired height is shorter than said second fired height.

3. The end effector of claim 1 , further comprising a knife slidably positionable in a knife slot.

4. The end effector of claim 1 , wherein said first fastener-supporting surfaces extend above said second fastener-supporting surfaces.

5. The end effector of claim 1 , wherein said plurality of fastener-forming pockets comprises:

an arcuate row of first fastener-forming pockets, wherein said fastener-forming pockets from said arcuate row of first fastener-forming pockets comprise a first maximum depth; and

an arcuate row of second fastener-forming pockets, wherein said fastener-forming pockets from said arcuate row of second fastener-forming pockets comprise a second maximum depth, and wherein said first maximum depth is different than said second maximum depth.

6. The end effector of claim 1 , wherein said plurality of fastener-forming pockets comprises:

an arcuate row of first fastener-forming pockets, wherein each said fastener-forming pocket of said arcuate row of first fastener-forming pockets comprises a first pocket apex defined by a first maximum depth; and

an arcuate row of second fastener-forming pockets, wherein each said fastener-forming pocket of said arcuate row of second fastener-forming pockets comprises a second pocket apex defined by a second maximum depth, wherein said first fastener-supporting surfaces are advanced to a first fired position during said fastener firing stroke, wherein said second fastener-supporting surfaces are advanced to a second fired position during said fastener firing stroke, wherein a first fastener-forming distance is defined between each said first fastener-supporting surface and a corresponding said first pocket apex as a result of said fastener firing stroke, wherein a second fastener-forming distance is defined between each said second fastener-supporting surface and a corresponding said second pocket apex as a result of said fastener firing stroke, and wherein said first fastener-forming distance is different than said second fastener-forming distance.

7. The end effector of claim 1 , further comprising a tissue-capturing element extendable toward said second jaw to capture patient tissue between said second jaw and said first jaw.

8. The end effector of claim 1 , wherein said first unfired height is the same as said second unfired height.

9. The end effector of claim 1 , wherein said plurality of fastener-forming pockets comprises:

an arcuate row of first fastener-forming pockets; and

an arcuate row of second fastener-forming pockets, and wherein said tissue-compression surface of said arcuate anvil comprises:

a first compression surface defining a first step comprising a first height, wherein said arcuate row of first fastener-forming pockets are defined in said first compression surface; and

a second compression surface defining a second step comprising a second height, wherein said first height is different than said second height, and wherein said arcuate row of second fastener-forming pockets are defined in said second compression surface.

10. The end effector of claim 1 , wherein said cartridge body comprises a first deck surface and a second deck surface, wherein said plurality of fastener cavities are defined in said first deck surface and said second deck surface, and wherein said first deck surface is stepped above said second deck surface.

11. An end effector for a surgical fastening instrument, said end effector comprising:

a frame;

a first jaw;

a second jaw extending fixedly from said frame, wherein said first jaw is movable relative to said second jaw;

a cartridge body comprising a tissue-supporting surface;

a plurality of fastener cavities defined in said cartridge body;

an arcuate row of first fasteners removably stored in said cartridge body, wherein each said first fastener comprises:

a first base; and

a first pair of legs extending from said first base, wherein a first unfired height is defined by said first base and said first pair of legs;

an arcuate row of second fasteners removably stored in said cartridge body, wherein said arcuate row of second fasteners extends alongside said arcuate row of first fasteners, wherein said arcuate row of second fasteners is radially offset from said arcuate row of first fasteners, and wherein each said second fastener comprises:

a second base; and

a second pair of legs extending from said second base, wherein a second unfired height is defined by said second base and said second pair of legs;

an arcuate anvil configured to deform said first fasteners to a first fired height and said second fasteners to a second fired height, wherein said first fired height is different than said second fired height, wherein said arcuate anvil comprises a tissue-compression surface extending transverse to said frame, and wherein said tissue-compression surface defines a plurality of fastener-forming pockets arranged in a first arcuate pocket row and a second arcuate pocket row;

first fastener-driver surfaces configured to advance said first fasteners toward said first arcuate pocket row during a fastener firing stroke; and

second fastener-driver surfaces configured to advance said second fasteners toward said second arcuate pocket row during said fastener firing stroke.

12. The end effector of claim 11 , wherein said first fired height is shorter than said second fired height.

13. The end effector of claim 11 , further comprising a knife slidably positionable in a knife slot.

14. The end effector of claim 11 , wherein said first fastener-driver surfaces extend above said second fastener-driver surfaces.

15. The end effector of claim 11 , wherein said fastener-forming pockets from said first arcuate pocket row comprise a first maximum depth, wherein said fastener-forming pockets from said second arcuate pocket row comprise a second maximum depth, and wherein said first maximum depth is different than said second maximum depth.

16. The end effector of claim 11 , wherein said fastener-forming pockets from said first arcuate pocket row comprise a first pocket apex defined by a first maximum depth, wherein said fastener-forming pockets from said second arcuate pocket row comprise a second pocket apex defined by a second maximum depth, wherein said first fastener-driver surfaces are advanced to a first fired position during said fastener firing stroke, wherein said second fastener-driver surfaces are advanced to a second fired position during said fastener firing stroke, wherein a first fastener-forming distance is defined between each said first fastener-driver surface and a corresponding said first pocket apex when said end effector is in a closed position, wherein a second fastener-forming distance is defined between each said second fastener-driver surface and a corresponding said second pocket apex when said end effector is in said closed position, and wherein said first fastener-forming distance is different than said second fastener-forming distance.

17. The end effector of claim 11 , wherein said tissue-compression surface of said arcuate anvil comprises:

a first compression surface defining a first step comprising a first height, wherein said first arcuate pocket row is defined in said first compression surface; and

a second compression surface defining a second step comprising a second height, wherein said first height is different than said second height, and wherein said second arcuate pocket row is defined in said second compression surface.

18. The end effector of claim 11 , wherein said cartridge body comprises a first deck surface and a second deck surface, and wherein said first deck surface is stepped above said second deck surface.

19. An end effector for a surgical stapling instrument, said end effector comprising:

a frame;

a first jaw;

a second jaw extending from said frame, wherein said second jaw is not movable relative to said frame, and wherein said first jaw is movable relative to said second jaw;

a cartridge body comprising an anvil-facing surface;

a plurality of staple cavities defined in said cartridge body;

an arcuate row of first staples removably stored in said cartridge body, wherein each said first staple comprises:

a first base; and

a first pair of legs extending from said first base, wherein a first unfired height is defined by said first base and said first pair of legs;

an arcuate row of second staples removably stored in said cartridge body, wherein said row of second staples extends alongside said row of first staples, wherein said row of second staples is radially offset from said row of first staples, and wherein each said second staple comprises:

a second base; and

a second pair of legs extending from said second base, wherein a second unfired height is defined by said second base and said second pair of legs;

an anvil configured to deform said first staples to a first fired height and said second staples to a second fired height, wherein said first fired height is different than said second fired height, wherein said anvil comprises a cartridge-facing surface extending transverse to said frame, and wherein said cartridge-facing surface defines a plurality of staple-forming pockets arranged in a first arcuate pocket row and a second arcuate pocket row;

first staple-driver surfaces configured to advance said first staples toward said first arcuate pocket row during a staple firing stroke; and

second staple-driver surfaces configured to advance said second staples toward said second arcuate pocket row during said staple firing stroke.

20. The end effector of claim 19 , wherein said first fired height is shorter than said second fired height.