Interbody implants and optimization features thereof

Patent metadata

Field	Value
Publication number	US-11065126-B2
Application number	US-201916535524-A
Country	US
Kind code	B2
Filing date	Aug 8, 2019
Priority date	Aug 9, 2018
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A spinal interbody device (IBD) includes a solid wall that at least partially defines a boundary of the IBD and a porous body connected to the solid wall. The porous body includes a plurality of sections that form at least a portion of both a superior and inferior bone interface side of the IBD. Each section of the porous body has a different porosity than an adjacent section such that the porosities increase toward a center of the IBD.

First claim

The invention claimed is:

1. A spinal interbody device (IBD) comprising:
a solid wall at least partially defining a boundary of the IBD; and
a porous body connected to the solid wall and having a plurality of sections forming at least a portion of both a superior and inferior bone interface side of the IBD, wherein each section of the porous body has a different porosity than an adjacent section such that the porosities increase toward a center of the IBD.

2. The IBD of claim 1 , wherein the plurality of sections include first and second sections, the first section forming a ring about the second section.

3. The IBD of claim 2 , wherein at least the first section is impregnated with a bioactive material so that particles of the bioactive material are disposed within pores of the porous first section.

4. The IBD of claim 3 , wherein a pore size of the second section is smaller than a particle size of the bioactive material such that the second section is substantially free from the bioactive material.

5. The IBD of claim 1 , further comprising solid projections embedded in the porous body and extending from the superior and inferior bone interface sides of the IBD.

6. The IBD of claim 1 , further comprising a plurality of elongate through-channels extending entirety through the porous body from the superior bone interface side to the inferior bone interface side of the IBD.

7. The IBD of claim 6 , further comprising a plurality elongate struts each partially defining a perimeter of a respective one of the elongate through-channels.

8. The IBD of claim 1 , wherein the porous body comprises a plurality of adjoined cells that collectively define a plurality of pores of the porous body, each cell of the porous body having a plurality of connected members.

9. The IBD of claim 8 , wherein the members of each cell have a different cross-sectional dimension based on their expected loads such that they each have a strain of between 1000 and 1800 micro strain when implanted in a disc space.

10. The IBD of claim 8 , wherein the cells of the porous body each have a geometric shape selected from the group consisting of a diamond cubic, single cubic, body-centered cubic, face centered cubic, tetrahedron, dodecahedron, or octahedron.

11. The IBD of claim 8 , wherein each section of the porous body includes cells of a different geometric shape than an adjacent section.

12. The IBD of claim 1 , wherein the porous body completely fills a space confined by the solid wall.

13. The IBD of claim 1 , wherein the solid wall includes bone engaging projections extending from superior and inferior sides thereof.

14. A spinal interbody device (IBD) comprising:
a solid wall; and
a porous body positioned within a boundary defined by the solid wall, the porous body having a plurality of sections such that a first section of the plurality of sections forms an outer bone contacting layer of the porous body and a second section of the plurality of sections forms an inner layer of the porous body so that when the IBD is implanted within a disc space defined partially by a vertebra, the first section is positioned closer to the vertebra than the second section, the first section having a first porosity that differs from a porosity of the second section.

15. The IBD of claim 14 , wherein the first section has a smaller porosity than the second section.

16. The IBD of claim 14 , wherein the first section has a greater porosity than the second section.

17. The IBD of claim 16 , wherein at least the first section is impregnated with a bioactive material so that particles of the bioactive material are disposed within pores of the porous first section.

18. The IBD of claim 17 , wherein a pore size of the second section is smaller than a particle size of the bioactive material such that the second section is substantially free from the bioactive material.

19. The IBD of claim 14 , further comprising solid projections embedded in the first section of the porous body and extending therefrom.

20. The IBD of claim 14 , further comprising a plurality of elongate through-channels extending entirely through the porous body from a superior side to an inferior side of the IBD and a plurality of elongate struts each partially defining a perimeter of a respective one of the elongate through-channels.

Assignees

• Stryker European Operations Holdings Llc

Inventors

• Newman Collin
• Schultz Christian Karl
• Willis Steven
• Sharifi-Mehr Amir Ali
• Buchert Oliver
• Bell Christopher P
• Ehlers Andrew Edward
• Reza Anna
• Long Marc Gilles
• Robinson Joseph Henry

Classifications

• A61F2/442 Primary

  Intervertebral or spinal discs, e.g. resilient (non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455) · CPC title

• A61F2310/00023

  Titanium or titanium-based alloys, e.g. Ti-Ni alloys · CPC title

• A61F2250/0018

  differing in elasticity, stiffness or compressibility · CPC title

• A61F2002/3092

  having an open-celled or open-pored structure · CPC title

• A61F2002/30303

  polypod-shaped · CPC title