Intervertebral implants

Patent metadata

Field	Value
Publication number	US-12186203-B2
Application number	US-202318360182-A
Country	US
Kind code	B2
Filing date	Jul 27, 2023
Priority date	Dec 12, 2018
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

An interbody implant can comprise a cage and a porous structure. The cage can comprise an anterior segment, a medial segment, a posterior segment and a lateral segment contiguously connected to each other to define an interior space. The porous structure can be located in the interior space and can be bounded by the cage. The porous structure can comprise opposed superior and inferior surfaces exposed through the cage, an internal cavity located in an interior of the porous structure, and a plurality of ports connecting the internal cavity to the superior and inferior surfaces. A superior-inferior stiffness of the interbody implant can be defined by the porous structure. The porous structure can be compressed within a patient by movement of the spine to biologically stimulate bone growth in vertebrae adjacent the interbody implant. The implant can be configured for lateral, anterior and posterior insertion at different spine levels.

First claim

The claimed invention is:

1. An interbody implant comprising:
a porous structure that is monolithic, the porous structure formed from a superior portion that extends from a middle portion in a first direction, and an inferior portion that extends from the middle portion in a second opposite direction, the porous structure comprising:
a superior surface of the superior portion that is opposite of an inferior surface of the inferior portion;
an anterior surface and an opposed posterior surface of the middle portion;
an internal cavity located in an interior of the porous structure;
a first set of one or more openings in the superior surface and a second set of one or more openings in the inferior surface connected via the internal cavity; and
a third set of one or more openings in the anterior surface and a fourth set of one or more openings in the opposed posterior surface connected via the internal cavity.

2. The interbody implant of claim 1 , wherein
the first set of one or more openings include a first plurality of openings defined within a first lattice structure formed by material of the superior portion,
wherein the second set of one or more openings include a second plurality of openings defined within a second lattice structure formed by material of the inferior portion,
wherein the third set of one or more openings include a third plurality of openings defined within a third lattice structure formed by material of the middle portion, and
wherein the fourth set of one or more openings include a fourth plurality of openings defined within a fourth lattice structure formed by additional material of the middle portion.

3. The interbody implant of claim 1 , further comprising a porous support wall extending across the internal cavity in a superior-inferior direction, wherein the porous support wall is located at a medial-lateral center of the interbody implant.

4. The interbody implant of claim 1 , wherein:
at least one of the first, second, third, or fourth sets of one or more openings comprises a plurality of hexa-lobular openings extending from an exterior of the porous structure to the internal cavity.

5. The interbody implant of claim 1 , wherein the porous structure comprises a plurality of ligaments defining open spaces therebetween, the plurality of ligaments forming a matrix of continuous channels having no dead ends, wherein the porous structure is fabricated from a porous metal material and has a porosity mimicking that of natural bone.

6. The interbody implant of claim 1 , further comprising:
a first cage having anterior, medial, posterior, and lateral segments contiguously connected to each other to define an interior space, wherein the superior portion of the porous structure is located within the interior space; and
a second cage having anterior, medial, posterior, and lateral segments contiguously connected to each other to define an additional interior space, wherein the inferior portion of the porous structure is located within the additional interior space.

7. The interbody implant of claim 6 , wherein the first cage and the second cage are uncoupled in a superior-inferior direction.

8. The interbody implant of claim 7 , further comprising a threaded socket located on a medial or lateral side of the interbody implant, the threaded socket having a superior portion located on the first cage and an inferior portion located on the second cage.

9. The interbody implant of claim 6 , further comprising a wedge structure located on an end of the interbody implant, wherein the wedge structure comprises opposing tapered surfaces that form a thinnest portion of the interbody implant in a superior-inferior direction.

10. The interbody implant of claim 6 , wherein:
the first cage has a superior surface that is flush with the superior surface of the porous structure; and
the second cage has an inferior surface that is flush with the inferior surface of the porous structure.

11. The interbody implant of claim 6 , wherein:
the anterior segments of the first and second cages are curved so that an anterior side of the interbody implant is convex;
the posterior segments of the first and second cages are curved so that a posterior side of the interbody implant is concave; and
a superior surface of the porous structure is curved.

12. The interbody implant of claim 11 , wherein the first cage and the second cage are connected by a socket, wherein the socket comprises a swivel coupling comprising:
a superior wall having a bore;
an inferior wall having a bore;
a first longitudinal surface connecting the superior wall and the inferior wall; and
a second longitudinal surface connecting the superior wall and the inferior wall;
wherein the first longitudinal surface and the second longitudinal surface are disposed at an angle to each other.

13. The interbody implant of claim 12 , wherein the interbody implant defines an insertion end and a coupling end and the first cage and the second cage are joined at the insertion end and the coupling end, wherein the first cage and the second cage are angled toward each other at the insertion end of the interbody implant and the first cage and the second cage come together at a rounded tip at the insertion end.

14. The interbody implant of claim 13 , wherein the insertion end comprises a pyramid and the coupling end includes a socket, wherein the insertion end is thicker than the coupling end.

15. The interbody implant of claim 12 , further comprising a socket piece embedded into the porous structure, wherein the socket piece is connected to the first cage and the second cage.

16. The interbody implant of claim 1 , wherein the interbody implant defines an angle between a superior side of the interbody implant and an inferior side of the interbody implant, wherein the angle is between approximately six degrees and approximately thirty degrees.

17. The interbody implant of claim 1 , wherein a superior-inferior stiffness of the interbody implant is defined by the porous structure.

18. An intervertebral implant for lateral insertion, the intervertebral implant comprising:
a porous structure formed of a porous material, the porous structure being monolithic, the porous structure including a superior panel that extends from a middle panel in a first direction, and an inferior panel that extends from the middle panel in a second opposite direction, the porous structure shaped to define:
an interior cavity located within the porous structure; and
a plurality of passages extending through the porous structure to intersect the interior cavity,
wherein the plurality of passages extend between a first set of one or more openings in a superior surface of the superior panel and a second set of one or more openings in an inferior surface of the inferior panel, and
wherein the plurality of passages extend between a third set of one or more openings in an anterior surface and a fourth set of one or more openings in an opposed posterior surface of the middle panel.

19. The intervertebral implant of claim 18 ,
wherein the first set of one or more openings include a first plurality of openings defined within a first lattice structure formed by material of the superior panel,
wherein the second set of one or more openings include a second plurality of openings defined within a second lattice structure formed by material of the inferior panel,
wherein the third set of one or more openings include a third plurality of openings defined within a third lattice structure formed by material

Assignees

• Zimmer Biomet Spine Inc

Inventors

• Jebsen Samuel
• Watson Ryan
• Bereau Marc
• Jouan Edouard

Classifications

• A61F2002/3093

  for promoting ingrowth of bone tissue · CPC title

• A61F2002/3092

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

• A61F2002/30281

  wedge-shaped · CPC title

• A61F2310/00023

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

• A61F2002/4629

  connected to the endoprosthesis or implant via a threaded connection · CPC title