Revision connector for spinal constructs

Patent metadata

Field	Value
Publication number	US-9510862-B2
Application number	US-81792010-A
Country	US
Kind code	B2
Filing date	Jun 17, 2010
Priority date	Jun 17, 2009
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

An extender system is configured to couple a vertebral bone anchor that has been previously implanted in a vertebra, or is newly implantable in a vertebra, to an adjacent bone, which can be an additional spinal level or an occiput, for example. The extender system includes an extension member having a body and an engagement member coupled to the body. The extension member defines an aperture extending through the engagement member. A screw is configured to attach the extension member to the vertebral bone anchor. The extension member can be fastened to the adjacent bone.

First claim

We claim:

1. An extender system configured to be operatively coupled to a vertebral implant that is secured to a vertebra, the vertebral implant including a first bone anchor and a first anchor seat that receives the first bone anchor, the extender system comprising:
an extension member that defines an aperture;
a bushing disposed in the aperture;
a fastener configured to couple the extension member to the first anchor seat, the fastener defining a distal portion that is configured to threadedly engage the first anchor seat so as to capture a spinal fixation rod disposed within the first anchor seat, and thereby fix the position of the first bone anchor relative to the first anchor seat and the spinal fixation rod; and
a second bone anchor configured to attach the extension member to an underlying bone disposed adjacent the vertebra,
wherein the extension member is polyaxially pivotable relative to the bushing.

2. The extender system as recited in claim 1 , wherein the fastener engages the bushing.

3. The extender system as recited in claim 1 , further comprising a locking member that engages a proximal end of the fastener opposite the distal end, such that the bushing is captured between the locking member and the vertebral implant.

4. The extender system as recited in claim 1 , further comprising a vertebral implant that includes the second bone anchor, a second anchor seat that is coupled to the bone anchor and configured to receive the extension member, and a locking cap configured to secure the extension member in the second anchor seat.

5. The extender system as recited in claim 1 , further comprising a locking member, wherein the fastener has a proximal end spaced from the distal end, the proximal end being configured to attach to the locking member, and a middle portion disposed between the proximal and distal ends, the middle portion configured to be received in the bushing such that the bushing is captured between the locking member and the anchor seat.

6. The extender system as recited in claim 5 , wherein the extension member defines an aperture extending through an engagement member of the extension member, and at least one of the middle portion of the fastener and an interior surface of the bushing is tapered, such that the middle portion of the fastener causes the bushing to expand against the engagement member when the fastener is inserted through the aperture of the engagement member.

7. The extender system as recited in claim 1 , wherein the extension member comprises a plate having a plate body and a plurality of apertures extending through the plate body, each aperture configured to receive the second bone anchor so as to attach the plate body to the underlying bone.

8. The extender system as recited in claim 7 , wherein the underlying bone comprises allograft.

9. The extender system as recited in claim 1 , wherein the underlying bone comprises a vertebra.

10. The extender system as recited in claim 1 , wherein the underlying bone comprises an occiput.

11. The extender system as recited in claim 1 , wherein the underlying bone comprises a lamina.

12. The extender system as recited in claim 1 , wherein the extension member is configured to connect the first anchor seat to a previously implanted translaminar screw.

13. The extender system as recited in claim 1 , further comprising an occipital plate configured to be fastened to an occiput and further configured to engage the extension member such that the extension member is coupled between the vertebra and the occiput.

14. The extender system as recited in claim 1 , wherein the extension member is configured to be offset with respect to the spinal fixation rod.

15. The extender system of claim 1 , wherein the extension member is configured as a rod.

16. The extender system of claim 15 , wherein the rod is linear.

17. The extender system of claim 15 , wherein the rod is curved.

18. A cascading extender system configured to fasten to a plurality of underlying bones, the cascading extender system comprising:
a plurality of construct extenders, each construct extender including:
a bone anchor configured to be implanted into an underlying bone and a bone anchor seat configured to receive the bone anchor,
an extension member including a body that defines a proximal end and an opposed distal end that is spaced from the proximal end along a first direction, the body being bent at a location between the distal end and the proximal end such that an entirety of the distal end is lower than the proximal end along a direction that is perpendicular to the first direction, the extension member further including an engagement member coupled to the proximal end, the extension member defining an aperture that extends through the engagement member; and
a fastener configured to couple the engagement member to a bone anchor seat that is configured to be implanted in another underlying bone.

19. The extender system as recited in claim 18 , wherein the extension member further includes an extension member body that is coupled to the engagement member.

20. The extender system as recited in claim 19 , wherein the extension member body is substantially coplanar with the engagement member.

21. The extender system as recited in claim 19 , wherein the extension member body is offset with respect to the engagement member.

22. The extender system as recited in claim 21 , wherein the extension member body is vertically offset with respect to the engagement member.

23. The extender system as recited in claim 21 , wherein the extension member body is angularly offset with respect to the engagement member.

24. The extender system as recited in claim 21 , wherein the extension member body is curved.

25. The extender system as recited in claim 24 , wherein the extension member body is S-shaped.

26. The extender system as recited in claim 19 , wherein the extension member comprises a rod having a substantially cylindrical rod body.

27. The cascading extender system as recited in claim 18 , wherein the extension member further includes a bushing that is polyaxially pivotable in the aperture, such that the fastener is configured to couple the bushing to the bone anchor seat.

28. The cascading extender system as recited in claim 18 , wherein the distal end is configured to be received by the bone anchor seat.

29. The cascading extender system as recited in claim 18 , wherein the fastener is configured to couple the engagement member to a bone anchor seat of an adjacent one of the construct extenders that is configured to be implanted in another underlying bone.

30. A method of connecting a select vertebra of a plurality of vertebra to an adjacent bone, wherein the plurality of vertebrae are attached to each other via a bone fixation assembly that includes a plurality of bone fixation elements attached to the vertebra and a spine fixation rod connected between the bone fixation elements, each bone fixation element including a bone anchor fastened to a respective vertebra, an anchor seat that receives the bone anchor and further receives the spine fixation rod, and a locking cap that fastens the spine fixation rod to the anchor seat, the method comprising the steps of:
removing the locking cap of the bone fixation element attached to the select vertebra;
connecting a distal end of a fasten

Assignees

• Montello Albert
• Levin Oleg
• Strausbaugh William
• Kueenzi Thomas
• Depuy Synthes Products Inc

Inventors

• Montello Albert
• Levin Oleg
• Strausbaugh William
• Kueenzi Thomas

Classifications

• A61B17/7002 Primary

  Longitudinal elements, e.g. rods · CPC title

• A61B17/7049

  Connectors, not bearing on the vertebrae, for linking longitudinal elements together (A61B17/7055, A61B17/7053, A61B17/7019 take precedence) · CPC title

• A61B17/7007

  Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads · CPC title

• A61B17/7001 Primary

  Screws or hooks combined with longitudinal elements which do not contact vertebrae (A61B17/7058 takes precedence) · CPC title

• A61B17/7011

  Longitudinal element being non-straight, e.g. curved, angled or branched (adjustable length longitudinal elements A61B17/7014; A61B17/7019 takes precedence, e.g. coil springs) · CPC title