PEDICULAR FACET FUSION SCREW WITH PLATE

• US 20120010669A1
• Filed: 07/12/2010
• Published: 01/12/2012
• Est. Priority Date: 07/12/2010
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Spine Incorporated (Johnson & Johnson)
• Inventors: O'Neil, Michael, Hawkins, John R., Fisher, Michael A., Fessler, Richard, Serhan, Hassan A., Stad, Shawn D., Hart, Robert M., Defossez, Henri, Labrom, Robert D., Betts, Duncan
• Granted Patent: US 9,044,277 B2
• Time in Patent Office: Days
• US Class Current: 606/305
• CPC Class Codes: A61B 17/7064 Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
• CPC Class Codes: A61B 17/8038 the additional component being inserted in the screw head
• CPC Class Codes: A61B 17/8061 specially adapted for particular bones A61B17/70 and A61B17/74 take precedence
• CPC Class Codes: A61B 17/8605 Heads, i.e. proximal ends projecting from bone
• CPC Class Codes: A61B 17/8625 Shanks, i.e. parts contacting bone tissue
• CPC Class Codes: A61B 17/8695 Washers surrounding screw head in plate hole A61B17/8047, between bone plate and bone A61B17/8028

Abstract

Spinal implants and methods for spinal stabilization and/or fusion are provided. Exemplary implants described herein can be configured for delivery to a facet joint to stabilize and/or fuse the facet joint, and can optionally be anchored within the pedicle for added fixation. The implant can optionally include a fusion-promoting bioactive material thereby providing a single device capable of spinal stabilization and/or fusion. Furthermore, a method of placing such an implant within a facet joint is provided.

Claims

1. A spinal implant, comprising:

an elongate member having a proximal head with a shank extending distally therefrom, the shank having a thread extending over at least a portion thereof, the proximal head being substantially spherical with an annular rim extending proximally therefrom; and

a stabilization member configured to rotate in all directions relative to the proximal head of the elongate member, the stabilization member having a proximal portion with an expandable diameter that is configured to seat the proximal head of the elongate member,

wherein the annular rim is configured to limit rotation of the stabilization member to prevent the stabilization member from extending over a proximal surface of the proximal head.

2. The spinal implant of claim 1, wherein the stabilization member includes a distal portion having at least one feature configured to engage a bony portion of a facet joint.

3. The spinal implant of claim 2, wherein the distal portion includes a plurality of bone piercing tines configured to engage a bony portion of a facet joint.

4. The spinal implant of claim 1, wherein the elongate member is cannulated.

5. The spinal implant of claim 3, wherein an outer surface of the plurality of bone piercing tines are angled inward toward the shank.

6. The spinal implant of claim 1, wherein the proximal head includes an expandable opening formed in a proximal portion thereof and concentrically aligned with the annular rim, the expandable opening configured to receive a set screw.

7. The spinal implant of claim 6, wherein the proximal head and the annular rim include at least one slit formed in a sidewall thereof configured to allow the proximal head to expand to receive a set screw.

8. The spinal implant of claim 7, wherein the proximal head and the annular rim are configured to expand to engage and interlock with the stabilization member when a set screw is disposed within the expandable opening.

9. The spinal implant of claim 6, wherein the proximal head includes a driving feature disposed distally to the expandable opening and configured to receive a driving tool to facilitate insertion of the elongate member.

10. The spinal implant of claim 1, wherein the proximal portion comprises a plurality of arms configured to expand to engage the proximal head.

11. The spinal implant of claim 1, wherein at least a portion of the shank is unthreaded.

12. The spinal implant of claim 1, wherein the implant includes a fusion-promoting bioactive material.

13. A spinal implant, comprising:

a distal bone engaging shank having a thread extending over at least a portion thereof;

a head formed on a proximal end of the shank and coupled to a stabilization member, the head being configured for rotational movement in all directions relative to the stabilization member; and

a rotation stop formed on a proximal portion of the head and configured to engage a proximal portion of the stabilization member to limit rotational motion of the head relative to the stabilization member.

14. The spinal implant of claim 13, wherein the rotation stop is an annular rim extending proximally from the head.

15. The spinal implant of claim 14, wherein the stabilization member includes an annular expandable sidewall configured to receive the head and having a radius greater than a radius of the annular rim, at least a portion of the annular expandable sidewall configured to engage at least a portion of the annular rim to limit rotational motion of the head relative to the stabilization member.

16. The spinal implant of claim 13, wherein the stabilization member includes a plurality of bone engaging tines extending distally from the annular expandable sidewall and configured to engage bone.

17. The spinal implant of claim 13, wherein the head includes an expandable opening formed therein configured for receiving a set screw.

18. The spinal implant of claim 16, wherein the head is configured to expand and interlock with the stabilization member when a set screw is threaded into the expandable opening.

19. The spinal implant of claim 13, wherein the stabilization member has a length and a width orthogonal to the length, the length being greater than the width.

20. The spinal implant of claim 19, wherein the stabilization member includes a plurality of expandable arms extending proximally therefrom in a substantially circular configuration, the expandable arms being configured to receive the head and a central axis of the expandable arms being offset from a central axis of the stabilization member.

21. The spinal implant of claim 19, wherein the stabilization member includes a bend zone formed therein configured to allow one side of the stabilization member to bend relative to an opposite side of the stabilization member to conform to a bone surface.

22. The spinal implant of claim 13, wherein the stabilization member includes a cavity formed therein configured to be filled with a fusion-promoting bioactive material.

23. A spinal implant, comprising:

an elongate member having a distal shank with a thread extending over at least a portion thereof and a substantially spherical proximal head coupled to a stabilization member, the stabilization member being configured to allow rotation of the elongate member in all directions relative to the stabilization member, the stabilization member including a plurality of expandable arms defining an opening for receiving the proximal head, the expandable arms being movable between a first diameter which is less than a diameter of the proximal head and a second diameter which is greater than the diameter of the proximal head.

24. The spinal implant of claim 23, wherein the proximal head includes an annular rim extending proximally therefrom and configured to engage the plurality of expandable arms to limit rotation of the elongate member.

25. The spinal implant of claim 23, wherein the stabilization member includes a plurality of bone engaging tines extending distally therefrom.

26. The spinal implant of claim 23, wherein the proximal head is expandable.

27. The spinal implant of claim 23, wherein the plurality of expandable arms are disposed in a substantially circular configuration defining a central axis.

28. The spinal implant of claim 27, wherein the stabilization member includes a lateral extension such that the central axis of the expandable arms are offset from a central axis of the stabilization member.

29. The spinal implant of claim 27, wherein the stabilization member includes a bend zone disposed between the lateral extension and the expandable arms, the bend zone configured to allow the lateral extension to be bent at an angle relative to the expandable arms.