Laterally insertable artificial vertebral disk replacement implant with translating pivot point

• US 20050154462A1
• Filed: 11/05/2004
• Published: 07/14/2005
• Est. Priority Date: 12/02/2003
• Status: Abandoned Application

• 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.
• Application Number:
  US10/981,863
• Publication Number:
  US 20050154462A1
• Time in Patent Office: Days
• US Class Current: 623/17.150
• 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. An intervertebral implant comprising:

a first end plate with a first inner surface;

a second end plate with a second inner surface opposing the first inner surface, where the second inner surface has an articulating element formed thereon; and

an attachment mechanism adapted to engage a vertebral body, wherein the attachment mechanism is adapted to extend, when implanted, along a lateral direction with respect to the vertebral body.

2. The implant of claim 1 wherein the articulating element allows movement of the vertebral body in between flexion to extension directions.

3. The implant of claim 1 wherein the attachment mechanism is aligned with and supports the articulating element.

4. The implant of claim 1 wherein the articulating element further comprises an elongated hemi-cylindrical structure protruding from the second inner surface and an elongated cavity in the first inner surface adapted to receive the hemi-cylindrical structure.

5. The implant of claim 1 wherein the attachment mechanism is a keel upstanding from at least one of the first end plate and the second end plate.

6. An intervertebral implant comprising:

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

a first inner surface;

a first outer surface; and

at least one keel on the first outer surface, wherein the keel is adapted to be perpendicular to a sagittal plane of the first vertebral body when implanted thereto;

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

a second inner surface opposing the first inner surface, wherein the second inner surface has a spacer coupled thereto; and

a second outer surface.

7. The implant of claim 6 wherein the spacer allows bending from flexion to extension.

8. The implant of claim 6, where the keel is aligned with and supports the spacer.

9. The implant of claim 6, further comprising at least one keel on the second outer surface, wherein the keel is oriented perpendicular to the sagittal plane when implanted to a second vertebral body.

10. The implant of claim 9 wherein the keel is supports the spacer.

11. An intervertebral implant comprising:

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

a first inner surface;

a first outer surface; and

at least one keel on the first outer surface, where the keel is adapted to be perpendicular to the sagittal plane of the vertebrae when implanted thereto;

a second end plate adapted to mate a second vertebrae, comprising;

a second inner surface opposing the first inner surface, where the second inner surface has extending spacer therefrom;

a second outer surface; and

at least one keel on the second outer surface, where the keel is adapted to be perpendicular to the sagittal plane of the vertebral body when implanted thereto.

12. The intervertebral implant of claim 11 wherein the spacer allows bending from flexion to extension.

13. The intervertebral implant of claim 11 wherein the keels on the first outer surface and the second outer surface support the spacer.

14. The intervertebral implant of claim 11 wherein the first end plate and second end plate have a lateral dimension longer than an anterior-posterior dimension.

15. An interspinous disk replacement implant adatped to be inserted between adjacent vertebral bodies, the implant having a first end plate, a second end plate, and an articulating element formed on the second end plate, the improvement comprising the implant having at least one keel that is about perpendicular to the sagittal plane of a vertebral body.

16. The implant of claim 15 wherein the articulating element is hemi-cylindrical.

17. An interspinous disk replacement implant adapted to be inserted between adjacent vertebral bodies, the implant having an articulating unit with a first end plate having a first inner surface with a first socket therein, a second end plate having a second inner surface opposing the first inner surface, the second inner surface with an articulating element formed thereon, where the articulating element is at least partially received in the first socket, the improvement of the implant comprising the implant having at least one keel extending from the articulating unit that is about perpendicular to the sagittal plane of a vertebral body.

18. The implant of claim 17 wherein the articulating element is hemi-cylindrical.

19. An interspinous disk replacement implant having a first end plate, a second end plate, and an articulating element between formed on the second end plate, the improvement comprising the implant having an attachment mechanism that supports the articulating element, the attachment mechanism adapted to laterally engage an adjacent vertebrae.

20. The implant of claim 19 wherein the attachment mechanism is at least one keel.

21. The implant of claim 19 wherein the articulating element is hemi-cylindrical.

22. An interspinous disk replacement implant having an articulating unit with a first end plate having a first inner surface with a first socket therein, a second end plate having a second inner surface opposing the first inner surface, the second inner surface with an articulating element formed thereon, where the articulating element is at least partially received in the first socket, the improvement of the implant comprising the implant having an attachment mechanism is aligned with and supports the articulating element, the attachment mechanism adapted to laterally engage an adjacent vertebrae.

23. The implant of claim 22 wherein the attachment mechanism is at least one keel.

24. The implant of claim 22 wherein the articulating element is hemi-cylindrical.

25. A kit to insert an interspinous disk replacement implant in a spine, the kit comprising:

an interspinous disk replacement implant adapted for lateral insertion into the spine; and

at least one tool for preparing the spine to receive the implant.

26. An interspinious implant comprising:

a first end plate having a first anterior end, a first posterior end and two first lateral ends extending between the first anterior and posterior ends;

a second end plate having a second anterior end, a second posterior end and two second lateral ends extending between the second anterior and posterior ends;

a spacer extending from the second end plate, the spacer having an elongated hemi-cylindrical configuration;

a first keel protruding from a first outer surface of the first end plate, wherein the first keel is oriented lengthwise between the two first lateral ends; and

a second keel protruding from a second outer surface of the second end plate, wherein the second keel is oriented lengthweise between the two second lateral ends.

27. An interspinous implant adapted to be inserted between adjacent vertebral bodies comprising:

an implant body having a first outer surface adapted to mate with a first vertebral body and a second outer surface adapted to mate with a second vertebral body;

an articulating element within the implant body, the articulating element having an elongated spacer and corresponding elongated socket;

a first keel protruding from the first outer surface and oriented generally parallel to the articulating element.