Method of laterally inserting an artificial vertebral disk replacement implant with translating pivot point

• US 20050143820A1
• Filed: 11/05/2004
• Published: 06/30/2005
• Est. Priority Date: 12/02/2003
• Status: Active Grant

• Current Assignee: Kyphon SARL (Medtronic Plc)
• Original Assignee: St. Francis Medical Technologies, Inc. (Medtronic Plc)
• Inventors: Flynn, John J., Mitchell, Steven T., Zucherman, James F., Winslow, Charles J., Hsu, Ken Y., Yerby, Scott A.
• Granted Patent: US 7,503,935 B2
• Time in Patent Office: Days
• US Class Current: 623/17.110
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61F 2/4425 made of articulated components
• CPC Class Codes: A61F 2002/30232 Half-cylinders
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/3065 Details of the ball-shaped head
• CPC Class Codes: A61F 2002/30654 Details of the concave socket
• CPC Class Codes: A61F 2002/30662 with rotation-limiting means
• CPC Class Codes: A61F 2002/30665 Dual arrangement of two adjacent ball-and-socket joints
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/448 comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00976 Coating or prosthesis-covering structure made of proteins or of polypeptides, e.g. of bone morphogenic proteins BMP or of transforming growth factors TGF

Abstract

An implant that can be placed between two vertebrae using a lateral insertion method is described. The implant is characterized by having a first end plate and a second end plate with a hemi-cylindrical spacer extending from the second end plate. The hemi-cylindrical spacer fits within a socket on the first end plate and allows for pivotal or rotational motion and also for twisting motion.

Claims

1. A method of inserting an intervertebral implant between adjacent vertebral bodies of a spine, comprising:

accessing a lateral side of an intervertebral space;

preparing the intervertebral space for insertion of the intervertebral implant; and

inserting the intervertebral implant laterally into the intervertebral space, the implant having a translating pivot point and an attachment mechanism adapted to extend along a lateral direction with respect to the vertebral bodies when inserted therebetween.

2. The method of claim 1 further comprising removing an affected disk before preparing the intervertebral space for insertion of the implant.

3. The method of claim 1 wherein intervertebral implant further comprises:

a socket having an elongated curved inner surface; and

a spacer having an elongated curved top surface adapted to be in contact with the curved inner surface of the socket.

4. The method of claim 1 wherein the attachment mechanism is aligned with and supports the implant.

5. The method of claim 1 wherein the translating pivot point accommodates a bending movement and twisting movement of the spine.

6. A method of inserting an intervertebral implant between upper and a lower vertebral bodies, comprising:

accessing a lateral side of an intervertebral space;

cutting a lateral keel receiving channel into a vertebral body;

where the lateral keel receiving channel is substantially perpendicular to the sagittal plane of the vertebral body; and

inserting an intervertebral implant between the upper and lower vertebral bodies, wherein the implant further comprises;

a first end plate adapted to mate with the upper vertebral body, further comprising;

a first inner surface;

a first outer surface; and

at least one laterally oriented keel on the first outer surface adapted to be inserted into the keel receiving channel;

a second end plate adapted to mate a second vertebral body further comprising;

a second inner surface opposing the first inner surface, wherein the second inner surface has a spacer formed thereon;

a second outer surface; and

a spacer having a translating pivot point positioned between the first end plate and the second end plate.

7. The method of claim 6 further comprising removing an affected disk before cutting a lateral keel receiving channel into the vertebral body.

8. The method of claim 6 wherein inserting an intervertebral implant further comprises pushing the implant between the upper and lower vertebral bodies utilizing a implantation tool.

9. The method of claim 6 wherein cutting the lateral keel further comprises cutting the keel receiving channel utilizing a keel cutting tool.

10. The method of claim 6 wherein the keel on the first outer surface is aligned with and supports the spacer.

11. The method of claim 6 wherein the second outer surface further comprises a second keel extending therefrom.

12. The method of claim 11 wherein the second keel on the second outer surface is aligned with and supports the spacer.

13. The method of claim 6 wherein the implant further comprises a pair of implants adapted to be positioned a distance apart from each other when inserted between the upper and lower vertebral bodies.

14. The method of claim 6 wherein the translating pivot point accommodates a bending movement and a twisting movement of the spine.

15. A method of inserting an intervertebral implant between adjacent upper and a lower vertebral bodies, comprising:

accessing a lateral side of an intervertebral space;

cutting a keel receiving channel into a vertebral body utilizing a keel cutting tool, wherein the keel receiving channel is oriented between lateral sides of the vertebral bodies; and

inserting a portion of an intervertebral implant into the keel receiving channel utilizing an implantation tool, wherein the implant includes a spacer having a translating pivot point.

16. The method of claim 15 further comprising removing an affected disk before cutting a lateral keel receiving channel into the vertebral body.

17. The method of claim 15 wherein the implant further comprises a first keel extending from a first outer surface and adapted to be inserted into the keel receiving channel, the first keel oriented to be perpendicular to the sagittal plane of the spine when inserted therein.

18. The method of claim 17 wherein implant further comprises a second keel extending from a second outer surface.

19. The method of claim 18 wherein the second keel on the second outer surface is aligned with and supports the spacer.

20. The method of claim 15 wherein the implant further comprises a pair of implants adapted to be positioned a distance apart from each other when inserted between the upper and lower vertebral bodies.

21. The method of claim 15 wherein the translating pivot point accommodates a bending movement and a twisting movement of the spine.

22. The method of claim 15 wherein the translating pivot point further comprises:

a first end plate of the implant including a socket therein; and

a second end plate of the implant including an elongated spacer extending therefrom, wherein the elongated spacer fits within the socket.

23. A method of implanting an intervertebral implant between adjacent vertebral bodies in a spine comprising cutting a keel receiving channel in one or more vertebral bodies utilizing a keel cutting tool, wherein the keel receiving channel is oriented between a first lateral side and a second lateral side of the vertebral bodies.

24. A method of implanting an intervertebral implant between adjacent vertebral bodies in a spine comprising pushing an implant having a pluality of keels into corresponding keel receiving channels in one or more vertebral bodies utilizing an implantation tool, wherein the implant is pushed between the adjacent vertebral bodies from a lateral approach.