Highly Lordosed Fusion Cage

• US 20160302938A1
• Filed: 06/27/2016
• Published: 10/20/2016
• Est. Priority Date: 06/26/2007
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: Hawkins, John Riley, Upal, Anwar, O'Neil, Michael J., Slivka, Michael Andrew, Fisher, Michael
• Granted Patent: US 9,839,530 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61F 2/30744 End caps, e.g. for closing an endoprosthetic cavity
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• 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 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/30403 Longitudinally-oriented cooperating ribs and grooves on mating lateral surfaces of a mainly longitudinal connection
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30448 using adhesives
• CPC Class Codes: A61F 2002/30451 soldered or brazed or welded
• CPC Class Codes: A61F 2002/30481 using a locking clip
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30685 Means for reducing or preventing the generation of wear particulates
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/3093 : for promoting ingrowth of bone tissue
• CPC Class Codes: A61F 2002/30975 : made of two halves
• 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 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4629 : connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2210/0004 : bioabsorbable
• 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 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2250/0098 : radio-opaque, e.g. radio-opaque markers
• 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 2310/00059 : Chromium or Cr-based alloys
• CPC Class Codes: A61F 2310/00161 : Carbon; Graphite
• CPC Class Codes: A61F 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00239 : containing zirconia or zirconium oxide ZrO2

Abstract

A fusion cage has a first component that defines an outside surface that is configured to engage a vertebral endplate, and an interior surface. The fusion cage has a second component that defines first and second opposed surfaces. One of the first and second opposed surfaces can mate with the interior surface of the first component. The fusion cage can include vertical and lateral throughholes adapted to enhance fusion.

Claims

1. (canceled)

2. An implant configured to be implanted into an intervertebral space between first and second vertebrae, the implant comprising:

a first component having;

proximal and distal ends that are spaced from one another along a first direction;

first and second sidewalls that are spaced from one another along a second direction, perpendicular to the first direction; and

inner and outer surfaces that are spaced from one another along a third direction, perpendicular to both the first and second direction, the outer surface configured to grip one of the first and second vertebrae, wherein the first component defines a through hole that extends through the outer surface along the third direction and between the first and second sidewalls, and the first component further defines a recess that extends into the inner surface; and

a second component having an inner surface configured to face the inner surface of the first component, the second component having a projection that extends between the first and second sidewalls along the second direction such that the projection is elongate along the second direction, and the projection is configured to mate with the recess when the second component is coupled to the first component.

3. The implant of claim 2, wherein the first direction is aligned with an insertion direction of the implant, and the inner surfaces extend parallel to the insertion direction.

4. The implant of claim 2, wherein the second component defines a through hole that extends through inner surface of the second component along the third direction.

5. The implant of claim 4, wherein the through hole of the second component is aligned with the through hole of the first component along the third direction.

6. The implant of claim 2, wherein the projection limits movement of the first component along the first direction.

7. The implant of claim 2, wherein the projection includes a ramped surface that is angularly offset with respect to the inner surface of the second component.

8. The implant of claim 2, wherein the projection includes a ramped surface that extends away from the inner surface of the second component as the ramped surface extends along the first direction.

9. The implant of claim 2, wherein the second component includes proximal and distal ends that are spaced from one another along the first direction, and the distal end of the second component is tapered.

10. The implant of claim 2, wherein the recess extends at least partially into the first and second sidewalls along the second direction.

11. An implant configured to be implanted into an intervertebral space between first and second vertebrae, the implant comprising:

a first component having proximal and distal ends that are spaced from one another along a first direction, a first pair of sides that are spaced from one another along a second direction, perpendicular to the first direction, and a first inner surface and a first outer surface that are spaced from one another along a third direction, perpendicular to both the first and second directions, the first outer surface configured to grip one of the first and second vertebrae, the first component defining a through hole that extends through the first inner and first outer surfaces and between the sides of the first pair of sides, and further defining a recess that extends into the first inner surface; and

a second component having proximal and distal ends that are spaced from one another along the first direction, a second pair of sides that are spaced from one another along the second direction, and a second inner surface and a second outer surface that are spaced from one another along the third direction, the second inner surface configured to face the first inner surface, and the second outer surface configured to grip another one of the first and second vertebrae, the first component defining a through hole that extends through the second inner and second outer surfaces and between the sides of the second pair of sides,

wherein the implant further comprises a projection that is elongate along the second direction and configured to be disposed in the recess when the implant is implanted into the intervertebral space.

12. The implant of claim 11, wherein the first and second inner surfaces extend parallel to an insertion direction of the implant.

13. The implant of claim 11, wherein the through hole of the second component is aligned with the through hole of the first component.

14. The implant of claim 11, wherein the recess extends at least partially into the sidewalls of the first pair along the second direction.

15. The implant of claim 11, wherein the projection includes a ramped surface that is angularly offset with respect to the first and second inner surfaces.

16. The implant of claim 11, wherein the projection includes a ramped surface that extends away from the first inner surface of the second component as the ramped surface extends along an insertion direction of the implant.

17. The implant of claim 11, wherein the projection limits movement of the first component along the first direction.

18. The implant of claim 11, wherein the distal end of the first component is tapered.