IMPLANT WITH SPIRAL ANCHOR

• US 20110166660A1
• Filed: 09/02/2009
• Published: 07/07/2011
• Est. Priority Date: 09/02/2008
• Status: Abandoned Application

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Laurence, Lawton
• Application Number:
  US13/061,372
• Publication Number:
  US 20110166660A1
• Time in Patent Office: Days
• US Class Current: 623/17.16
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• 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 2/4425 made of articulated components
• 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 2/446 having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
• 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 2002/30289 helically-coiled
• 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 2002/30563 having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
• CPC Class Codes: A61F 2002/30581 having a pocket filled with fluid, e.g. liquid
• CPC Class Codes: A61F 2002/30593 hollow
• 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 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0091 helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
• 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 2310/00329 Glasses, e.g. bioglass
• CPC Class Codes: A61F 2310/00359 : Bone or bony tissue
• 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 intervertebral implant (100) for insertion into an intervertebral disc space between adjacent vertebral bodies. The implant includes an intervertebral spacer (105) and a spiral anchor (110) for securely coupling to both the intervertebral spacer and to at least one of the adjacent vertebral bodies. The at least one spiral anchor is configured to partially embed within a portion of the vertebral body.

Claims

1. A spinal implant for insertion into an intervertebral disc space between first and second vertebral bodies, the implant comprising:

an intervertebral spacer; and

a spiral anchor securely coupled to both the intervertebral spacer and to the first and second vertebral bodies, the spiral anchor configured to at least partially embed within at least a portion of the first and second vertebral bodies, a longitudinal axis of the spinal anchor being generally parallel to a longitudinal axis of the spacer in an assembled configuration.

2. The implant of claim 1, wherein the spacer includes concave-shaped grooves, the spiral anchor positioned within the concave-shaped grooved in the assembled configuration.

3. The implant of claim 1, wherein the spiral anchor is comprised of a first spiral anchor and a second spiral anchor, the first spiral anchor is coupled to both the intervertebral spacer and the first vertebral body and the second spiral anchor is coupled to both the intervertebral spacer and to the second vertebral body in an implanted position.

4. The implant of claim 1, wherein the intervertebral spacer comprises an upper surface, a lower surface, a pair of through holes extending from the upper surface to the lower surface and a separating wall separating the pair of through holes, the spiral anchor is configured to be at least partially received within the through holes in the assembled configuration.

5. The implant of claim 1, wherein the spacer includes a protruding portion.

6. The implant of claim 5, wherein the protruding portion includes a bore, the bore positioned proximate a second end of the anchor in the assembled configuration.

7. The implant of claim 6, wherein the spiral anchor extends around the intervertebral spacer such that the anchor does not contact the spacer at any point other than being received within the bore in the assembled configuration.

8. The implant of claim 1 further comprising:

a rotatable pin that couples the spiral anchor to the intervertebral spacer so that the spiral anchor and pin can be rotated to facilitate insertion of the anchor into the vertebral bodies.

9. The implant of claim 1, wherein the spiral anchor includes a driver tang so that rotation of the driver tang enables the embedding of the spiral anchor.

10. A method for inserting an implant including a spacer portion and a spiral anchor into an intervertebral disc space between first and second vertebral bodies, the method comprising the steps of:

a) inserting the spacer portion of the implant into the disc space;

b) coupling an instrument to the spiral anchor;

c) rotating the spiral anchor into engagement with the intervertebral spacer and into engagement with at least one of the first and second vertebral bodies, rotation of the at least one spiral anchor at least partially embedding the anchor within at least a portion of one of the first and second vertebral bodies; and

d) releasing the spiral anchor from the instrument.

11. The method of claim 10, wherein rotation of the spiral anchor in step (c) at least partially embeds the anchor within the first and second vertebral bodies.

12. The method of claim 11, wherein step (c) includes rotating a first spiral anchor into engagement with the intervertebral spacer and into engagement with the first vertebral body and rotating a second spiral anchor into engagement with the intervertebral spacer and into engagement with the second vertebral body.

13. A spinal implant for insertion into an intervertebral disc space between first and second vertebral bodies, the implant comprising:

a superior endplate adapted for engaging the first vertebral body;

an inferior endplate adapted for engaging the second vertebral body;

a superior spinal anchor secured to the superior endplate and the first vertebral body in an implanted position; and

an inferior spiral anchor secured to the inferior endplate and the second vertebral body in the implanted position.

14. The spinal implant of claim 13 further comprising:

a central element mounted between the superior and inferior endplates, the central element permitting motion between the superior and inferior endplates.

15. The spinal implant of claim 14 wherein the central element is comprised of an elastomeric core.

16. The spinal implant of claim 14 wherein the central element is comprised of an articulating element.

17. The spinal implant of claim 14 wherein the central element is comprised of a fluid filled bellows.

18. The spinal implant of claim 13 wherein the superior and inferior endplates include a plurality of perforations to accommodate the superior and inferior spiral anchors, respectively, in an assembled configuration.