Intervertebral spinal implant

Patent metadata

Field	Value
Publication number	US-10682238-B2
Application number	US-201816151737-A
Country	US
Kind code	B2
Filing date	Oct 4, 2018
Priority date	May 8, 2018
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

An intervertebral implant for implantation in an intervertebral space between vertebrae. The implant includes a body extending from an upper surface to a lower surface. The body has a front end, a rear end and a pair of spaced apart first and second side walls extending between the front and rear walls such that an internal chamber is defined within the front and rear ends and the first and second walls. The body defines an outer perimeter and an inner perimeter extending about the internal chamber. At least one of the side walls is defined by an integral porous structure which extends from the outer perimeter to the inner perimeter. The at least one of the side walls is free of vertical solid support structure between the upper and lower surface.

First claim

What is claimed is:

1. An intervertebral implant for implantation in an intervertebral space between vertebrae, the implant comprising:
a body extending from an upper surface to a lower surface, the body having a front end, a rear end and a pair of spaced apart first and second side walls extending between the front and rear ends such that an internal chamber is defined within the front and rear ends and the first and second side walls, the body defining an outer perimeter and an inner perimeter extending about the internal chamber,
wherein at least one of the first and second side walls is defined by an integral porous structure extending from the upper surface to lower surface and from the outer perimeter to the inner perimeter, and at least one of the first and second side walls is free of any vertical solid support structure between the upper and lower surfaces, the integral porous structure having an average pore size of less than 800 μm in diameter.

2. The intervertebral implant of claim 1 , wherein both of the first and second side walls are defined by the integral porous structure extending from the upper surface to lower surface and from the outer perimeter to the inner perimeter, and both of the first and second side walls are free of any vertical solid support structure between the upper and lower surfaces, the average porosity of the integral porous structure being greater than 50%.

3. The intervertebral implant of claim 1 , wherein the first and second side walls include spaced apart solid upper rim members in the upper surface and spaced apart solid lower rim members in the lower surface, and a solid horizontal support structure includes at least one strut extending along the upper surface or the lower surface.

4. The intervertebral implant of claim 3 , wherein the at least one strut includes one or more cross struts extending between the solid upper rim members and one or more cross struts extending between the solid lower rim members.

5. The intervertebral implant of claim 4 , wherein each of the cross struts defines a portion of a surface serration or tooth configured to engage with adjacent vertebrae.

6. The intervertebral implant of claim 1 , wherein a lateral window is defined through at least one of the first and second side walls and the porosity of the integral porous structure is greater than 60%.

7. The intervertebral implant of claim 6 , wherein a solid support frame extends about the lateral window.

8. The intervertebral implant of claim 7 , wherein the solid support frame includes at least one frame ring supported by a portion of a support structure defining a rear wall at the rear end.

9. The intervertebral implant of claim 1 , wherein the lateral window is defined through at least one of the first and second side walls and wherein:
the integral porous structure has an average pore size of between 400 μm and 700 μm in diameter; and
the porosity of the integral porous structure is greater than 60%.

10. The intervertebral implant of claim 1 , wherein the rear end is defined substantially by a solid wall.

11. The intervertebral implant of claim 1 , wherein the rear end is defined in part by a solid wall and in part by the porous structure with portions of the porous structure defining a part of the rear end.

12. An intervertebral implant for implantation in an intervertebral space between vertebrae, the implant comprising:
a body having a front end, a rear end and opposed side walls extending between the ends, the body having an outer perimeter and an inner perimeter about an internal chamber, the body comprising:
an upper surface and a lower surface, the upper surface defined by a solid upper outer rim and a spaced apart solid upper inner rim and the lower surface defined by a solid lower outer rim and a spaced apart solid lower inner rim;
a solid front wall extending at the front end between at least the solid upper outer rim and the solid lower outer rim;
a solid rear wall extending at the rear end between at least the solid upper outer rim and the solid lower outer rim;
each of the side walls free of any solid struts extending between the upper and lower surfaces; and
a porous structure integrally formed with the solid upper rims, the solid lower rims, and the solid front and rear walls, the porous structure extending from the outer perimeter to the inner perimeter of the body and having an average pore size of less than 800 μm in diameter.

13. The intervertebral implant of claim 12 , wherein one or more cross struts extend between the solid upper rims and one or more cross struts extend between the solid lower rims.

14. The intervertebral implant of claim 13 , wherein each of the cross struts defines a portion of a surface serration or tooth configured to engage with adjacent vertebrae.

15. The intervertebral implant of claim 12 , wherein a lateral window is defined through at least one of the side walls and the porosity of the integral porous structure is greater than 60%.

16. The intervertebral implant of claim 15 , wherein a solid support frame extends about the lateral window.

17. The intervertebral implant of claim 16 , wherein the solid support frame includes at least one frame ring supported by a portion of the solid rear wall.

18. The intervertebral implant of claim 12 , wherein a lateral window is defined through at least one of the side walls and wherein:
the integral porous structure has an average pore size of between 400 μm and 700 μm in diameter; and
the porosity of the integral porous structure is greater than 60%.

19. A method of forming an intervertebral implant for implantation in an intervertebral space between vertebrae, the method comprising:
forming an upper surface defined by a solid upper outer rim and a spaced apart solid upper inner rim;
forming a lower surface defined by a solid lower outer rim and a spaced apart solid lower inner rim;
forming a solid front wall extending at a front end between at least the solid upper outer rim and the solid lower outer rim;
forming a solid rear wall extending at a rear end between at least the solid upper outer rim and the solid lower outer rim;
forming side walls extending between the front and rear ends with each of the side walls free of any solid struts extending between the upper and lower surfaces; and
integrally forming a porous structure with the solid upper rims, the solid lower rims and the solid front and rear walls, the porous structure extending from an outer perimeter of the implant to an inner perimeter extending about an internal chamber of the implant.

20. The method of claim 19 , further comprising defining a lateral window through at least one of the side walls wherein the step of forming a porous structure includes forming by, thermal sintering, the porous structure having an average pore size of less than 800 μm in diameter and a porosity of greater than 60%.

Assignees

• Globus Medical Inc

Inventors

• Petersheim Samuel
• Miccio Mark

Classifications

• A61F2002/4628

  with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping · CPC title

• A61F2002/30971

  Laminates, i.e. layered products · CPC title

• A61F2/4465

  having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine · CPC title

• A61F2002/30604

  modular · CPC title

• A61F2002/30785

  parallel · CPC title