Method and apparatus for intervertebral implant anchorage

• US 6,113,638 A
• Filed: 02/26/1999
• Issued: 09/05/2000
• Est. Priority Date: 02/26/1999
• Status: Expired due to Term

• Current Assignee: IMDS LLC
• Original Assignee: Lytton A. Williams, Robert G. Watkins
• Inventors: Williams, Lytton A., Watkins, Robert G.
• Primary Examiner(s): Hirsch, Paul J.
• Assistant Examiner(s): Priddy, Michael B.
• Application Number:
  US09/259,503
• Time in Patent Office: 557 Days
• Field of Search: 623/17, 623/16, 606/61
• US Class Current: 128/898
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61F 2/30724 Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• 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 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30154 square
• CPC Class Codes: A61F 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30187 D-shaped or half-disc-shaped
• CPC Class Codes: A61F 2002/30225 Flat cylinders, i.e. discs
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/3028 polyhedral different from parallelepipedal and pyramidal
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30579 : with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30593 : hollow
• CPC Class Codes: A61F 2002/30594 : slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30604 : modular
• CPC Class Codes: A61F 2002/30772 : Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30777 : Oblong apertures
• CPC Class Codes: A61F 2002/30785 : parallel
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30789 : perpendicular with respect to each other
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/30971 : Laminates, i.e. layered products
• 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 2002/4635 : using minimally invasive surgery
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0006 : circular
• CPC Class Codes: A61F 2230/0008 : elliptical or oval
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0021 : square
• CPC Class Codes: A61F 2230/0026 : trapezoidal
• CPC Class Codes: A61F 2230/0034 : D-shaped
• CPC Class Codes: A61F 2230/0063 : Three-dimensional shapes
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2240/001 : Designing or manufacturing processes
• 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 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00239 : containing zirconia or zirconium oxide ZrO2
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
• 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
• CPC Class Codes: Y10S 606/907 : Composed of particular material or coated
• CPC Class Codes: Y10S 606/909 : Bone
• CPC Class Codes: Y10S 606/91 : Polymer
• CPC Class Codes: Y10S 606/912 : Radiolucent material

Abstract

Methods and devices are provided for intervertebral implant anchorage. An implantable device for insertion into an intradiscal section between adjacent vertebrae is provided. The implantable device includes at least one anchor plate which comprises a plate member sized to be positioned within an intradiscal section between adjacent vertebrae and a plurality of anchoring elements extending from a surface of the plate member, each anchoring element including a distal portion capable of being introduced into the vertebra through the vertebral end plate; and an intradiscal component coupled to the anchor plate.

Claims

1. An implantable device for insertion into an intradiscal section between adjacent vertebrae, the device comprising:

an anchor plate comprising a plate member sized to be positioned within an intradiscal section between adjacent vertebra and a plurality of anchoring elements extending from a surface of the plate member, each anchoring element including a distal portion capable of being introduced into an end plate of one of the adjacent vertebrae; and

an intradiscal component coupled to the anchor plate, the intradiscal component including a cage having a first side for positioning adjacent a first vertebra and a second side for positioning adjacent a second vertebra, the first side including a plurality of holes through which the anchoring elements on the anchor plate can be positioned, and the second side including at least one hollow bore.

2. An implantable device according to claim 1 wherein the anchor plate includes at least 3 anchoring elements.

3. An implantable device according to claim 1 wherein the anchor plate has a non-smooth surface.

4. An implantable device according to claim 1 wherein the anchor plate has at least one hollow bore.

5. An implantable device according to claim 1 wherein at least one of the anchoring elements includes a lumen.

6. An implantable device according to claim 1 wherein at least one of the anchoring elements includes a lumen at least 0.5 mm in diameter.

7. An implantable device according to claim 1 wherein the anchoring elements extend substantially perpendicular from the anchor plate.

8. An implantable device according to claim 1 wherein the anchoring elements extend angularly from the anchor plate.

9. An implantable device according to claim 1 wherein the anchoring elements have at least one curved distal end.

10. An implantable device according to claim 1 wherein the anchoring elements have a smooth outer surface.

11. An implantable device according to claim 1 wherein the anchoring elements do not include a thread for screwing the anchoring element into the vertebrae.

12. An implantable device according to claim 1 wherein the intradiscal component includes an artificial disc.

13. An implantable device according to claim 1 wherein the intradiscal component further includes at least one channel adapted to receive bone graft material therein.

14. An implantable device according to claim 1 wherein the intradiscal component includes a spacer.

15. An implantable device according to claim 1 wherein the anchoring elements include a distal portion capable of piercing an end plate of a vertebrae which does not already have holes for the anchoring elements.

16. An implantable device for insertion into an intradiscal space between adjacent vertebra, the device comprising:

a first anchor plate comprising a plate member sized to be positioned within an intradiscal section between adjacent vertebra and a plurality of anchoring elements extending from a surface of the plate member, each anchoring element including a distal portion capable of being introduced into an end plate of one of the adjacent vertebrae;

a second anchor plate comprising a plate member sized to be positioned within an intradiscal section between adjacent vertebra and a plurality of anchoring elements extending from a surface of the plate member, each anchoring element including a distal portion capable of being introduced into an end plate of one of the adjacent vertebrae; and

an intradiscal component coupled to the first and second anchor plates, the intradiscal component including a cage having a first side for positioning adjacent a first vertebra and a second side for positioning adjacent a second vertebra, the first side including a plurality of holes through which the anchoring elements on the first anchor plate can be positioned, and the second side including a plurality of holes through which the anchoring elements on the second anchor plate can be positioned.

17. An implantable device according to claim 16 wherein the intradiscal component includes an artificial disc.

18. An implantable device according to claim 16 wherein the intradiscal component further includes at least one channel adapted to receive bone graft material therein.

19. An implantable device according to claim 16 wherein the intradiscal component includes a spacer.

20. An implantable device according to claim 16 wherein the anchoring elements include a distal portion capable of piercing an end plate of a vertebrae which does not already have holes for the anchoring elements.

21. A kit for forming an implantable device for insertion into an intradiscal section between adjacent vertebrae, the kit comprising:

an intradiscal component sized to be positioned within an intradiscal section between first and second adjacent vertebrae, the intradiscal component comprising a cage having a first side for positioning adjacent the first vertebra and a second side for positioning adjacent the second vertebra, the first side of the cage including a plurality of holes; and

an anchor plate comprising a plate member and a plurality of anchoring elements extending from a surface of the plate member, the anchor plate being positionable within the cage and the anchoring elements being extendable out of the cage through the plurality of holes.

22. A kit according to claim 21 wherein the anchoring elements are adapted to be extended out of the cage in a direction approximately perpendicular to a plane of an end plate of the first vertebra.

23. A kit according to claim 21 wherein the intradiscal component further includes at least one channel adapted to receive bone graft material therein.

24. A kit according to claim 21 wherein the intradiscal component further includes at least one channel adapted to receive a device for causing the anchoring elements to be introduced into an end plate of the first vertebra.

25. A kit according to claim 21 wherein the anchoring elements include a distal portion capable of piercing an end plate of a vertebrae which does not already have holes for the anchoring elements.

26. A kit for forming an implantable device for insertion into an intradiscal section between adjacent vertebrae, the kit comprising:

an intradiscal component sized to be positioned within an intradiscal section between first and second adjacent vertebrae, the intradiscal component comprising a cage having a first side for positioning adjacent the first vertebra and a second side for positioning adjacent the second vertebra, the first and second sides of the cage including a plurality of holes;

a first anchor plate comprising a plate member and a plurality of anchoring elements extending from a surface of the plate member, the first anchor plate being positionable within the cage and the anchoring elements being extendable out of the cage through the plurality of holes on the first side of the cage; and

a second anchor plate comprising a plate member and a plurality of anchoring elements extending from a surface of the plate member, the second anchor plate being positionable within the cage and the anchoring elements being extendable out of the cage through the plurality of holes on the second side of the cage.

27. A kit according to claim 26 wherein the anchoring elements of the first and second anchor plates are adapted to be extended out of the cage in a direction approximately perpendicular to end plate surfaces of the first and second vertebrae.

28. A kit according to claim 26 wherein the intradiscal component further includes at least one channel adapted to receive bone graft material therein.

29. A kit according to claim 26 wherein the intradiscal component further includes at least one channel adapted to receive a device for causing the anchoring elements to be introduced into end plates of the first and second vertebrae.

30. A kit according to claim 26 wherein the anchoring elements include a distal portion capable of piercing an end plate of a vertebrae which does not already have holes for the anchoring elements.

31. A method for anchoring an implantable device within an intradiscal section between adjacent vertebrae, the method comprising:

creating a space between the adjacent vertebrae;

inserting into the space created an implantable device comprising

a first anchor plate comprising a plate member sized to be positioned within the space and a plurality of anchoring elements extending from a surface of the plate member, each anchoring element including a distal portion capable of being introduced into an end plate of one of the adjacent vertebrae,

a second anchor plate comprising a plate member sized to be positioned within the space and a plurality of anchoring elements extending from a surface of the plate member, each anchoring element including a distal portion capable of being introduced into an end plate of one of the adjacent vertebrae, and an intradiscal component coupled to the first and second anchor plates; and

causing the anchoring elements on the first and second anchor plates to be introduced into the adjacent vertebrae through each of the vertebral end plates by applying a force to the anchor plate approximately perpendicular to a plane of the end plate so as to cause the anchoring elements on the anchor plate to be introduced into the vertebra through the vertebral end plate.

32. A method for anchoring an implantable device within an intradiscal section between adjacent vertebrae, the method comprising:

creating a space between the adjacent vertebrae;

inserting into the space created an implantable device comprising

a first anchor plate comprising a plate member sized to be positioned within the space and a plurality of anchoring elements extending from a surface of the plate member, each anchoring element including a distal portion capable of being introduced into an end plate of one of the adjacent vertebrae,

a second anchor plate comprising a plate member sized to be positioned within the space and a plurality of anchoring elements extending from a surface of the plate member, each anchoring element including a distal portion capable of being introduced into an end plate of one of the adjacent vertebrae, and an intradiscal component coupled to the first and second anchor plates; and

causing the anchoring elements on the first and second anchor plates to be introduced into the adjacent vertebrae through each of the vertebral end plates without first creating one or more holes in the vertebrae for the anchoring elements.