Interbody implants and optimization features thereof
View Patent ↗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.
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.