Zero-profile interbody spacer and coupled plate assembly

• US 10,531,960 B2
• Filed: 07/08/2016
• Issued: 01/14/2020
• Est. Priority Date: 11/07/2008
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: McDonough, William P., Strausbaugh, William L., Bonner, Christopher, Pepe, Thomas, Meili, Ralph, Hunziker, Markus, Jeger, Michael, Kueenzi, Thomas, Koch, David, Ponzer, Rainer, Richter, Joern, Berger, Roger
• Primary Examiner(s): Beccia, Christopher J
• Application Number:
  US15/205,173
• Publication Number:
  US 20160317321A1
• Time in Patent Office: 1,285 Days
• CPC Class Codes: A61B 17/1728 for holes for bone plates or plate screws
• CPC Class Codes: A61B 17/1757 for the spine
• CPC Class Codes: A61B 17/7059 Cortical plates A61B17/7007, A61B17/7058 take precedence
• CPC Class Codes: A61B 17/8033 having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
• CPC Class Codes: A61B 17/8042 the additional component being a cover over the screw head
• CPC Class Codes: A61B 17/8052 immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
• CPC Class Codes: A61B 17/8057 the interlocking form comprising a thread
• CPC Class Codes: A61B 17/809 with bone-penetrating elements, e.g. blades or prongs bone staples A61B17/0642; intramedullary nails with a plate at an end A61B17/7233
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61B 17/88 Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices A61B17/7074 takes precedence
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30505 spring biased
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30517 using a locking plate
• CPC Class Codes: A61F 2002/30576 with extending fixation tabs
• CPC Class Codes: A61F 2002/30593 : hollow
• CPC Class Codes: A61F 2002/30604 : modular
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3079 : Stepped or enlarged apertures, e.g. having discrete diameter changes
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• 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 2002/4615 : of spacers
• CPC Class Codes: A61F 2220/0016 : with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0034 : D-shaped
• 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 2310/00131 : Tantalum or Ta-based alloys
• CPC Class Codes: A61F 2310/00407 : Coating made of titanium or of Ti-based alloys
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Abstract

An implant for insertion into the disc space between vertebrae. The implant including a spacer portion, a plate portion coupled to the spacer portion, a plurality of bone fixation elements for engaging the vertebrae and a retention mechanism for preventing the bone fixation elements from postoperatively uncoupling from the implant.

Claims

1. An intervertebral implant comprising:

an implant body including a first surface and a second surface, the implant body defining a bone fixation hole that extends from a first opening defined by the first surface to a second opening defined by the second surface such that the bone fixation hole defines a non-linear path between the first opening and the second opening, wherein the first and second openings are spaced from each other along a first direction, and the implant body defines a top vertebral-facing surface, and a bottom vertebral-facing surface that is

     1) opposite the top surface along a second direction that is substantially perpendicular to the first direction, and

     2) configured to face a second vertebral body; and

a bone fixation element configured to be inserted through the bone fixation hole such that the bone fixation element follows the non-linear path between the first opening and the second opening, wherein the first opening includes a guide slot configured to guide the bone fixation element to rotate along the non-linear path as it is driven into the bone fixation hole.

2. The intervertebral implant of claim 1, wherein the implant body includes a third surface that is spaced from both the first surface and the second surface in the first direction, and the second surface is between the first surface and the third surface with respect to the first direction.

3. The intervertebral implant of claim 2, wherein the implant body includes a plate portion and a spacer portion, the spacer portion configured to be coupled to the plate portion such that:

1) the plate portion defines the first surface and the second surface,

     2) the spacer portion defines the third surface, and

     3) the first surface is opposite the third surface.

4. The intervertebral implant of claim 2, wherein an entirety of the first opening is positioned between the top surface and the bottom surface with respect to the second direction.

5. The intervertebral implant of claim 4, wherein the bone fixation hole is a first bone fixation hole, the non-linear path is a first non-linear path, the implant body defines a second bone fixation hole that extends from a third opening defined by the first surface to a fourth opening such that the second bone fixation hole defines a second non-linear path between the third opening and the fourth opening.

6. The intervertebral implant of claim 5, wherein the bone fixation element is a first bone fixation element, the intervertebral implant further comprising a second bone fixation element configured to be inserted through the second bone fixation hole such that the second bone fixation element follows the second non-linear path between the third opening and the fourth opening.

7. The intervertebral implant of claim 5, wherein the first bone fixation hole is spaced from the second bone fixation hole by a distance measured in a third direction that is substantially perpendicular to both the first direction and the second direction.

8. The intervertebral implant of claim 7, wherein the first bone fixation hole is aligned with the second bone fixation hole with respect to the third direction such that a straight line in the third direction passes through both the first bone fixation hole and the second bone fixation hole.

9. The intervertebral implant of claim 4, wherein the implant body defines a hole that:

1) extends through both the top surface and the bottom surface, and

     2) is positioned between the second surface and the third surface with respect to the first direction.

10. The intervertebral implant of claim 9, wherein the bone fixation element passes through a portion of the hole.

11. The intervertebral implant of claim 1, wherein the bone fixation element is a blade.

12. The intervertebral implant of claim 11, wherein the blade defines a width and a height, the width and the height each measured in a respective direction perpendicular to the respective direction of the other of the width and the height, the width being greater than the height.

13. The intervertebral implant of claim 1, wherein the first opening includes at least one guide slot configured to guide the bone fixation element along the non-linear path.

14. The intervertebral implant of claim 11, wherein the blade is a spiral blade.

15. The intervertebral implant of claim 14, wherein the spiral is a twisted spiral.

16. The intervertebral implant of claim 15, wherein the blade is elongate along a central blade axis, and the blade extends continuously and uninterrupted along the central axis.

17. The intervertebral implant of claim 14, wherein the spiral blade is received through the first opening.

18. The intervertebral implant of claim 17, wherein the spiral blade exits out the second opening.

19. The intervertebral implant of claim 14, wherein the first opening has a height along the second direction, and the bone fixation element has a height from an uppermost surface of the bone fixation element to a lowermost surface of the bone fixation element along the second direction, and the height of the bone fixation element is no greater than the height of the first opening.

20. The intervertebral implant of claim 1, wherein the first opening is fully enclosed by the first surface.