Expandable vertebral implant

Patent metadata

Field	Value
Publication number	US-9844446-B2
Application number	US-201615147363-A
Country	US
Kind code	B2
Filing date	May 5, 2016
Priority date	May 5, 2016
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

An expandable prosthetic implant for engagement between vertebrae includes a first member having a first end, a second end, a plurality of extensions and a hollow interior portion extending from the first end to the second end, wherein the plurality of extensions extend from the first end to the second end. A second member includes a first end, a second end, a hollow interior portion extending from the first end to the second end, and a plurality of extensions extending from the second end to the first end. The plurality extensions of the first member are configured to coaxially interdigitate with the second member, and the plurality of extensions of the second member are configured to coaxially interdigitate with the first member. The first member of the implant is moveable relative to the second member along a longitudinal axis.

First claim

What is claimed is:

1. An expandable prosthetic implant for engagement between vertebrae, comprising:
a first member having a first end, a second end, a plurality of extensions and a hollow interior portion extending from the first end to the second end, wherein the plurality of extensions extend from the first end to the second end,
a second member having a first end, a second end, a hollow interior portion extending from the first end to the second end, and a plurality of extensions extending from the second end to the first end, the plurality extensions of the first member configured to coaxially interdigitate with the first member, and the plurality of extensions of the second member configured to coaxially interdigitate with the first member and wherein the first member is moveable relative to the second member along a longitudinal axis;
a ring positioned coaxial to the first member and the second member and axially fixed to the second member; and
an actuator coupled to the second member and operationally coupled to the ring for locking the first member to the second member,
wherein at least one of the plurality of extension of the first member includes engagement features for coupling with the corresponding engagement element configured on an inner surface of the ring,
wherein the ring is configured to be rotated from a first position to a second position by rotation of the actuator, and
wherein in the first position, the first member is freely moveable with respect to the second member and in a second position, the first member is locked in a position with respect to the second member.

2. The implant of claim 1 , wherein the first member and the second member include surfaces having a plurality of spaced apart endplate engagement features for coupling to a first and second endplates.

3. The implant of claim 1 , wherein the second member includes a first opening and a second opening for a receiving a first pin and a second pin, the first and second pin configured to couple the ring to the second member.

4. The implant of claim 3 , wherein the ring includes a slot extending on the perimeter of outer surface of the ring and configured to receive a first or second pin.

5. The implant of claim 1 , wherein the ring includes an inner surface and an outer surface, the inner surface further including spaced apart engagement portions for engaging with the engagement features of at least one of the plurality of extensions of the first member.

6. The implant of claim 1 , wherein the ring includes a marking to visual gauge the first position and the second position.

7. The implant of claim 1 , wherein the actuator is positioned within one of the plurality of extension of the second member.

8. The implant of claim 1 , wherein the plurality of extensions of the second member have an outer surface that includes a ledge that is configured to receive the ring.

9. An expandable prosthetic implant for engagement between vertebrae, comprising:
a first member having a first end, a second end, a plurality of extensions and a hollow interior portion extending from the first end to the second end, wherein the plurality of extensions extend from the first end to the second end,
a second member having a first end, a second end, a hollow interior portion extending from the first end to the second end, and a plurality of extensions extending from the second end to the first end, the plurality extensions of the first member configured to coaxially interdigitate with the first member, and the plurality of extensions of the second member configured to coaxially interdigitate with the first member and wherein the first member is moveable relative to the second member along a longitudinal axis; and
an actuator coupled to one of the plurality of extensions of the second member;
wherein at least one of the plurality of extension of the first member includes engagement features for coupling with the corresponding engagement element configured on side surfaces of the one of the plurality of extensions of the second member,
wherein when the actuator is rotated from a first position to a second position, the one of the plurality of extensions flexes out, whereby the engagement features of the first member engages with the engagement element of the one of the plurality of extensions of the second member thereby locking the first member with respect to the second member, and
wherein in the first position, the first member is freely moveable with respect to the second member and in a second position, the first member is locked in a position with respect to the second member.

10. The implant of claim 9 , wherein the actuator is positioned within one of the plurality of extension of the second member.

11. The implant of claim 9 , wherein the one of the plurality of extensions of the second member includes a housing for receiving the actuator.

12. The implant of claim 11 , wherein the one of the plurality of extensions includes a slot that extends from the housing to the second end of the second member.

13. The implant of claim 9 wherein the one of the plurality of extensions is configured to flex.

14. The implant of claim 9 , wherein the engagement features and engagement element are one of non-helical threads, tabs, teeth, and protrusions.

15. The implant of claim 9 , wherein an instrument is used to move the first member relative to the second member.

16. The implant of claim 9 , wherein the first member and the second member include endplate engagement features for engaging with a first and a second endplate.

17. An expandable prosthetic implant for engagement between vertebrae, comprising:
a first member having a first end, a second end, a plurality of extensions and a hollow interior portion extending from the first end to the second end, wherein the plurality of extensions extend from the first end to the second end;
a second member having a first end, a second end, a hollow interior portion extending from the first end to the second end, and a plurality of extensions extending from the second end to the first end, the plurality extensions of the first member configured to coaxially interdigitate with the first member, and the plurality of extensions of the second member configured to coaxially interdigitate with the first member and wherein the first member is moveable relative to the second member along a longitudinal axis; and
an endplate having a plurality of slots and being configured to be compressible,
wherein the endplate includes an upper surface for engaging with a vertebral body, and an extension portion having an engagement element that engages with endplate engagement features of the first or second members, and
wherein the plurality of slots extend from the upper surface of the endplate to a lower surface of the endplate.

18. The implant of claim 17 , wherein the endplate further includes the engagement element is a rim.

19. The implant of claim 17 , wherein the engagement element is a plurality of connection elements spaced apart on a bottom surface of the endplate.

20. The implant of claim 17 , wherein an instrument is used to position the endplate.

Assignees

• Globus Medical Inc

Inventors

• Mclaughlin Colm
• Himmelberger James

Classifications

• A61F2/4611 Primary

  of spinal prostheses · CPC title

• A61F2002/30556

  for adjusting thickness · CPC title

• A61F2002/30601

  telescopic · CPC title

• A61F2/446 Primary

  having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones · CPC title

• A61F2002/30507

  using a threaded locking member, e.g. a locking screw or a set screw · CPC title