Distractible intervertebral implant

Patent metadata

Field	Value
Publication number	US-10548741-B2
Application number	US-201715411005-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Jun 29, 2010
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A distractible intervertebral implant configured to be inserted in an insertion direction into an intervertebral space that is defined between a first vertebral body and a second vertebral body is disclosed. The implant may include a first body and a second body. The first body may define an outer surface that is configured to engage the first vertebral body, and an opposing inner surface that defines a rail. The second body may define an outer surface that is configured to engage the second vertebral body, and an inner surface that defines a recess configured to receive the rail of the first body. The second body moves in a vertical direction toward the second vertebral body as the second body is slid over the first body and the rail is received in the recess.

First claim

What is claimed:

1. A method of implanting a distractible intervertebral implant into an intervertebral space defined between a first vertebral body and a second vertebral body, the method comprising steps of:
inserting first and second implant bodies of the distractible intervertebral implant into the intervertebral space along an insertion direction such that an inner surface of the first implant body faces an inner surface of the second implant body, an outer surface of the first implant body faces the first vertebral body, and an outer surface of the second implant body faces the second vertebral body, the inserting step causing at least one of a ramped surface of the first implant body and a first surface of the distractible intervertebral implant to translate along another of the ramped surface and the first surface so as to cause the outer surface of at least one of the first and second implant bodies to move away from the outer surface of another one of the first and second implant bodies along a second direction, perpendicular to the insertion direction;
affixing the implant to the first and second vertebral bodies by (i) inserting a first fixation member through a first bore defined in the first implant body and into the first vertebral body, and (ii) passing a second fixation member through a first recess in the first implant body and then through a second bore defined in the second implant body and into the second vertebral body.

2. The method of claim 1 , wherein the inserting step causes at least one of a ramped surface of the second implant body and a second surface of the distractible intervertebral implant to translate along the other so as to cause at least one of the outer surfaces of the first and second implant bodies to move away from the outer surface of another one of the first and second implant bodies along the second direction.

3. The method of claim 1 , wherein the affixing step comprises inserting a third fixation member through a third bore defined in the second implant body and into the second vertebral body.

4. The method of claim 3 , wherein the affixing step comprises inserting the first to third fixation members such that the first fixation member is spaced between the second and third fixation members with respect to a third direction, perpendicular to both the insertion direction and the second direction.

5. The method of claim 1 , wherein the affixing step comprises passing the first fixation member through a second recess in the second implant body as the first fixation member is inserted into the first bore.

6. The method of claim 1 , wherein the first implant body includes a second ramped surface, the second ramped surface being spaced from the ramped surface of the first implant body along the insertion direction.

7. The method of claim 6 , wherein the ramped surface of the first implant body and the second ramped surface of the first implant body are angled with respect to the insertion direction.

8. The method of claim 6 , wherein the second ramped surface of the first implant body is angled away from the first outer surface of the first implant body as the second ramped surface of the first implant body extends in a direction opposite the insertion direction.

9. The method of claim 1 , wherein the affixing step comprises inserting the first fixation member through the first bore and into an endplate of the first vertebral body.

10. The method of claim 9 , wherein the affixing step comprises inserting the second fixation member through the second bore and into an endplate of the second vertebral body.

11. The method of claim 1 , wherein the affixing step comprises inserting at least one of the first and second fixation members along a central axis of a respective one of the first and second bores that is angled with respect to the insertion direction.

12. A method of implanting a distractible intervertebral implant into an intervertebral space defined between a first vertebral body and a second vertebral body, the method comprising steps of:
inserting first and second implant bodies of the distractible intervertebral implant into the intervertebral space along an insertion direction such that an inner surface of the first implant body faces an inner surface of the second implant body, an outer surface of the first implant body faces the first vertebral body, and an outer surface of the second implant body faces the second vertebral body, the step of inserting the first and second implant bodies causing at least one of a ramped surface of the first implant body and a first surface of the distractible intervertebral implant to translate over the other so as to cause the outer surface of at least one of the first and second implant bodies to move away from the outer surface of another one of the first and second implant bodies along a second direction, perpendicular to the insertion direction;
affixing the first and second implant bodies to the first and second vertebral bodies by inserting (i) a first fixation member through a first bore defined in the first implant body and into the first vertebral body, and (ii) second and third fixation members through second and third bores defined in the second implant body and into the second vertebral body, wherein the first to third fixation members are inserted such that the first fixation member is spaced between the second and third fixation members with respect to a third direction, perpendicular to both the insertion direction and the second direction.

13. The method of claim 12 , wherein the first implant body includes a second ramped surface, the second ramped surface being spaced from the ramped surface of the first implant body along insertion direction.

14. The method of claim 13 , wherein the ramped surface of the first implant body and the second ramped surface of the first implant body are angled with respect to the insertion direction.

15. The method of claim 13 , wherein the second ramped surface of the first implant body is angled away from the first outer surface of the first implant body as the second ramped surface of the first implant body extends in a direction opposite the insertion direction.

16. The method of claim 12 , wherein the affixing step comprises inserting the first fixation member through the first bore and into an endplate of the first vertebral body.

17. The method of claim 16 , wherein the affixing step comprises inserting the second fixation member through the second bore and into an endplate of the second vertebral body.

18. The method of claim 12 , wherein the affixing step comprises inserting at least one of the first to third fixation members along a central axis of a respective one of the first to third bores that is angled with respect to the insertion direction.

19. The method of claim 12 , wherein the inserting step comprises translating at least one ramped surface of the second implant body along at least one surface of the distractible intervertebral implant so as to cause the outer surfaces of the first and second implant bodies to move away from one another along the second direction.

Assignees

• Depuy Synthes Products Inc

Inventors

• Suedkamp Jann-Paul
• Saidha Sean
• Brun Philipp

Classifications

• A61F2/4455 Primary

  for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages (intervertebral discs A61F2/442) · CPC title

• A61F2220/0041

  using additional screws, bolts, dowels or rivets, e.g. connecting screws · CPC title

• A61F2002/30843

  Pyramidally-shaped · CPC title

• A61F2310/00023

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

• A61F2240/001

  Designing or manufacturing processes · CPC title