Three dimensional adjuncts

1. A stapling assembly for use with a surgical stapler, comprising:

a body having a plurality of staples disposed therein, the plurality of staples being configured to be deployed into tissue; and

a three-dimensional compressible adjunct formed from a matrix comprising at least one fused bioabsorbable polymer and configured to be releasably retained on the body such that the adjunct can be attached to tissue by the plurality of staples in the body, wherein the adjunct has a first stiffness when compressed a first amount and a second stiffness when compressed a second amount greater than the first amount;

wherein the adjunct has a plurality of interconnected struts each having two bend zones, the first bend zone being configured to bend when the adjunct is compressed the first amount and the second bend zone being configured to bend when the adjunct is compressed the second amount, and

wherein the plurality of interconnected struts each have a first segment with a first width and a second segment with a second width that is greater than the first width such that each strut is wider along a majority of a length thereof.

2. The stapling assembly of claim 1 , wherein the adjunct includes at least one stop element configured to limit an amount of compression of the adjunct.

3. The stapling assembly of claim 1 , wherein the at least one fused bioabsorbable polymer is selected from the group consisting of thermoplastic absorbable polyurethane, ultraviolet curable absorbable polyurethane, poly(lactic acid), polycaprolactone, polyglycolide, polydioxanone, poly(lactic-co-glycolic acid), polyglycolic acid, trimethylene carbonate, glycolide, dioxanone, polyester, copolymers thereof, and combinations thereof.

4. The stapling assembly of claim 1 , wherein the adjunct is configured to apply a stress of at least about 3 gf/mm 2 to the tissue stapled thereto for at least 3 days when the adjunct is in a tissue deployed state.

5. The stapling assembly of claim 1 , wherein the adjunct includes a plurality of openings.

6. The stapling assembly of claim 1 , wherein the plurality of interconnect struts define a first portion, an opposite second portion of the adjunct, and a channel therebetween that is configured to receive a cutting element, wherein the first and second portions are selectively connected by at least one bridging member extending across the channel.

7. The stapling assembly of claim 1 , wherein the plurality of interconnected struts are interconnected at nodes, wherein the plurality of interconnected struts are formed of a first fused bioabsorbable polymer and the nodes are formed of a second fused bioabsorbable polymer that differs from the first fused bioabsorbable polymer.

8. A stapling assembly for use with a surgical stapler, comprising:

a body having a plurality of staples disposed therein, the plurality of staples being configured to be deployed into tissue; and

a three-dimensional compressible adjunct formed from a matrix comprising at least one fused bioabsorbable polymer and configured to be releasably retained on the body such that the adjunct can be attached to the tissue by the plurality of staples in the body, wherein the adjunct has a variable stiffness profile such that when the adjunct is in a tissue deployed state, the adjunct is configured to apply a stress at or above a minimum stress threshold to the tissue for at least about 3 days;

wherein the adjunct has a plurality of interconnected struts each having two bend zones, the first bend zone being configured to bend when the adjunct is compressed under a first stress and the second bend zone being configured to bend when the adjunct is compressed under a second stress that is greater than the first stress, and

wherein the plurality of interconnected struts are interconnected at nodes, wherein the plurality of interconnect struts are formed a first fused bioabsorbable polymer and the nodes are formed of a second fused bioabsorbable polymer that differs from the first fused bioabsorbable polymer.

9. The stapling assembly of claim 8 , wherein the plurality of staples have a height of about 0.130 inches or less when in a formed configuration.

10. The stapling assembly of claim 8 , wherein the minimum stress threshold is at least about 3 gf/mm 2 .

11. The stapling assembly of claim 8 , wherein the adjunct has a stiffness that increases as the adjunct compresses.

12. The stapling assembly of claim 8 , wherein the adjunct includes at least one stop element configured to limit an amount of compression of the adjunct.

13. The stapling assembly of claim 8 , wherein the at least one fused bioabsorbable polymer is selected from the group consisting of thermoplastic absorbable polyurethane, ultraviolet curable absorbable polyurethane, poly(lactic acid), polycaprolactone, polyglycolide, polydioxanone, poly(lactic-co-glycolic acid), polyglycolic acid, trimethylene carbonate, glycolide, dioxanone, polyester, copolymers thereof, and combinations thereof.

14. The stapling assembly of claim 8 , wherein the adjunct includes a plurality of openings.

15. The stapling assembly of claim 8 , wherein the plurality of interconnect struts define a first portion, an opposite second portion of the adjunct, and a channel therebetween that is configured to receive a cutting element, wherein the first and second portions are selectively connected by at least one bridging member extending across the channel.

16. A stapling assembly for use with a surgical stapler, comprising:

a body having a plurality of staples disposed therein, the plurality of staples being configured to be deployed into tissue; and

a three-dimensional compressible adjunct formed from a matrix comprising at least one fused bioabsorbable polymer and configured to be releasably retained on the body such that the adjunct can be attached to tissue by the plurality of staples in the body, the adjunct being formed of repeating units with each unit being formed of a first strut and a second strut interconnected at a node, wherein the first and second struts each have a first portion and a second portion with the first portion proximate the node,

wherein each first portion is configured to bend while the adjunct is under a first stress to cause the adjunct to compress from a pre-compressed state to a first compressed state, and wherein each second portion is configured to contact an adjacent second portion while the adjunct is under a second stress that is greater than the first stress to cause the adjunct to move from the first compressed state to a second compressed state.

17. The stapling assembly of claim 16 , wherein the first and second struts are formed of a first fused bioabsorbable polymer and the nodes are formed of a second fused bioabsorbable polymer that differs from the first fused bioabsorbable polymer.

18. The stapling assembly of claim 16 , wherein the adjunct includes at least one stop element configured to limit an amount of compression of the adjunct.

19. The stapling assembly of claim 16 , wherein each repeating unit is formed of the first strut, the second strut and third and fourth struts has an X shape.