Spinal implant fixation assembly

• US 20050277928A1
• Filed: 06/14/2004
• Published: 12/15/2005
• Est. Priority Date: 06/14/2004
• Status: Active Grant

• Current Assignee: Zimmer Biomet Spine, Inc. (Zimvie Incorporated)
• Original Assignee: Zimmer Spine, Inc. (Zimmer Biomet Holdings, Inc.)
• Inventors: Boschert, Paul F.
• Granted Patent: US 7,857,834 B2
• Time in Patent Office: Days
• US Class Current: 606/328
• CPC Class Codes: A61B 17/7011 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 Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7037 wherein pivoting is blocked when the rod is clamped
• CPC Class Codes: A61B 2017/867 with integral locking or clamping means

Abstract

An orthopedic fixation device for securing a rod to a bone is provided. The fixation device includes a receiver with two legs, a pocket defined between the legs, an anchor including a head, and a seat structure that mounts within the receiver. The seat structure includes a top seat for receiving the rod and a bottom seat for receiving the head of the anchor. The top seat includes two legs defining a pocket and first and second raised ridges that are spaced apart from one another. The legs each define a recessed portion extending between the two raised ridges.

Claims

1. An orthopedic fixation device for securing a rod to a bone comprising:

a receiver including two legs and a pocket defined between the legs;

an anchor including a head; and

a seat structure that mounts within the receiver, the seat structure including a top seat for receiving the rod and a bottom seat for receiving the head of the anchor, the top seat including two legs defining a pocket, the top seat also including first and second raised ridges that are spaced apart from one another, the legs each defining a recessed portion extending between the two raised ridges.

2. An orthopedic fixation device according to claim 1, wherein the receiver includes a top and a bottom end and wherein the anchor is loaded through the bottom end of the receiver.

3. An orthopedic fixation device according to claim 1, wherein the bottom seat provides substantially full ring contact with the head of the anchor regardless of the orientation of the anchor relative to the receiver.

4. An orthopedic fixation device according to claim 2, wherein a ring is secured to the bottom end of the receiver to secure the head of the anchor within the receiver.

5. An orthopedic fixation device according to claim 3, wherein the ring provides substantially full ring contact with the head of the anchor regardless of the orientation of the anchor relative to the receiver.

6. An orthopedic fixation device according to claim 1, wherein the raised ridges form contact regions with the rod and a non-contact region with the rod.

7. An orthopedic fixation device according to claim 1, wherein the receiver includes a keying feature for limiting rotation of the seat structure relative to the receiver, wherein the receiver includes an interior that has a complementary shape to an exterior of the seat structure.

8. An orthopedic fixation device according to claim 2, wherein the seat structure is loaded through the bottom end of the receiver.

9. An orthopedic fixation device according to claim 1, further comprising a locking mechanism for securing the rod within the receiver.

10. An orthopedic fixation device according to claim 9, wherein the locking mechanism includes a set screw threaded into the pocket of the receiver.

11. An orthopedic fixation device according to claim 9, wherein the locking mechanism includes a nut threaded about an exterior of the legs of the receiver.

12. An orthopedic fixation device for securing a rod to a bone comprising:

a receiver including two legs and a pocket defined between the legs;

an anchor including a head;

a seat structure that mounts within the receiver, the seat structure including a top seat for receiving the rod and a bottom seat for receiving the head of the anchor;

a ring secured to the receiver such that the head of the anchor is captured between the ring and the bottom seat of the seat structure;

the bottom seat providing substantially full ring contact with the head of the anchor regardless of the orientation of the anchor relative to the receiver; and

the ring providing substantially full ring contact with the head of the anchor regardless of the orientation of the anchor relative to the receiver.

13. An orthopedic fixation device according to claim 12, wherein the receiver includes a top and a bottom end and wherein the anchor is loaded through the bottom end of the receiver.

14. An orthopedic fixation device according to claim 12, wherein the top seat includes two legs defining a pocket, the top seat also including first and second raised rod contacting structures that are spaced apart from one another, the legs each defining a recessed portion extending between the two raised rod contacting structures.

15. An orthopedic fixation device according to claim 12, wherein the receiver includes a keying feature for limiting rotation of the seat structure relative to the receiver, wherein the receiver includes an interior that has a complementary shape to an exterior of the seat structure.

16. An orthopedic fixation device according to claim 13, wherein the seat structure is loaded through the bottom end of the receiver.

17. An orthopedic fixation device according to claim 12, further comprising a locking mechanism for securing the rod within the receiver.

18. An orthopedic fixation device according to claim 17, wherein the locking mechanism includes a set screw threaded into the pocket of the receiver.

19. An orthopedic fixation device according to claim 17, wherein the locking mechanism includes a nut threaded about an exterior of the legs of the receiver.

20. An orthopedic fixation device for securing a rod to a bone comprising:

a receiver including two legs and a pocket defined between the legs;

an anchor including a head;

a seat structure that mounts within the receiver, the seat structure including a top seat for receiving the rod and a bottom seat for receiving the head of the anchor; and

the receiver including a keying feature for limiting rotation of the seat structure relative to the receiver, wherein the receiver includes an interior shape that complements an exterior shape of the seat structure.

21. An orthopedic fixation device according to claim 20, wherein the receiver includes a top and a bottom end and wherein the anchor is loaded through the bottom end of the receiver.

22. An orthopedic fixation device according to claim 20, wherein the bottom seat provides substantially full ring contact with the head of the anchor regardless of the orientation of the anchor relative to the receiver.

23. An orthopedic fixation device according to claim 21, wherein a ring is secured to the bottom end of the receiver to secure the head of the anchor within the receiver.

24. An orthopedic fixation device according to claim 23, wherein the ring provides substantially full ring contact with the head of the anchor regardless of the orientation of the anchor relative to the receiver.

25. An orthopedic fixation device according to claim 21, wherein the seat structure is loaded through the bottom end of the receiver.

26. An orthopedic fixation device according to claim 20, further comprising a locking mechanism for securing the rod within the receiver.

27. An orthopedic fixation device according to claim 26, wherein the locking mechanism includes a set screw threaded into the pocket of the receiver.

28. An orthopedic fixation device according to claim 26, wherein the locking mechanism includes a nut threaded about an exterior of the legs of the receiver.

29. An orthopedic fixation device according to claim 20, wherein the top seat includes two legs defining a pocket, the top seat also including first and second raised rod contacting structures that are spaced apart from one another, the legs each defining a recessed portion extending between the two raised rod contacting structures.

30. An orthopedic fixation system comprising:

a rod;

an anchor including a head;

a receiver including two legs and a pocket defined between the legs;

a seat structure that mounts within the receiver, the seat structure including a top seat for receiving the rod and a bottom seat for receiving the head of the anchor;

the top seat including two legs defining a pocket, the top seat also including first and second raised rod contacting structures that are spaced apart from one another, the legs each defining a recessed portion extending between the two raised rod contacting structures;

a ring secured to the receiver such that the head of the anchor is captured between the ring and the bottom seat of the seat structure;

the bottom seat providing substantially full ring contact with the head of the anchor regardless of the orientation of the anchor relative to the receiver;

the ring providing substantially full ring contact with the head of the anchor regardless of the orientation of the anchor relative to the receiver; and

the receiver including a keying feature for limiting rotation of the seat structure relative to the receiver, wherein the receiver includes an interior shape that complements an exterior shape of the seat structure.