Facet joint implant device

• US 9,220,608 B2
• Filed: 04/24/2012
• Issued: 12/29/2015
• Est. Priority Date: 04/24/2012
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: McKay, William F.
• Primary Examiner(s): BECCIA, CHRISTOPHER J
• Application Number:
  US13/454,596
• Publication Number:
  US 20130282128A1
• Time in Patent Office: 1,344 Days
• Field of Search: 606/60, 606246-279, 623 1711- 1716
• US Class Current: 1/1
• CPC Class Codes: A61B 17/7064 Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
• 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 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• 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 2002/30225 Flat cylinders, i.e. discs
• CPC Class Codes: A61F 2002/30448 using adhesives
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30891 Plurality of protrusions
• CPC Class Codes: A61F 2310/00179 Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00293 containing a phosphorus-containing compound, e.g. apatite
• CPC Class Codes: A61F 2310/00341 Coral, e.g. aragonite, porite
• CPC Class Codes: A61F 2310/00359 Bone or bony tissue
• CPC Class Codes: A61F 2310/00365 Proteins; Polypeptides; Degradation products thereof

Abstract

A bone graft implant device for treating a tissue site is provided, the device including an implant body including a demineralized allograft bone material portion, and at least one engagement member protruding from the implant body including a mineralized allograft bone material portion. The engagement member may be integrally formed with the implant body, or alternatively, the implant body may include an aperture and the engagement member may be insertable therein. At least one of the amount of demineralization or area of the demineralized allograft bone material portion is adjustable to impart a desired flexibility to the implant body.

Claims

1. A bone graft implant device for treating a tissue site, the device comprising:

an implant body including a demineralized portion, the implant body having an outer surface comprising fully demineralized portions and surface demineralized portions located at discrete positions on the outer surface of the implant, the discrete positions being surface demineralized to a depth of about 50 microns to about 5000 microns, the implant body comprising a modulus of elasticity in the range of about 1×

10⁵ to about 2×

10⁵ dynes/cm²; and

at least one engagement member protruding from the demineralized portion, the engagement member comprising only a mineralized portion.

2. A bone graft implant device of claim 1, wherein the implant body comprises a disc shape.

3. A bone graft implant device of claim 1, wherein the implant body comprises allograft bone material.

4. A bone graft implant device of claim 1, wherein the demineralized portion comprises demineralized allograft bone material.

5. A bone graft implant device of claim 1, wherein the mineralized portion of the engagement member comprises mineralized allograft bone material.

6. A bone graft implant device of claim 5, wherein the engagement member is integrally formed with the implant body and comprises at least one protrusion formed on at least one surface of the implant body.

7. A bone graft implant device of claim 5, wherein the implant body further includes an aperture extending into the demineralized portion.

8. A bone graft implant device of claim 7, wherein (i) the engagement member comprises an elongate pin-shaped member configured to be insertable within said aperture or (ii) the engagement member comprises an elongate pin-shaped member configured to be mate with a corresponding recess in bone.

9. A bone graft implant device of claim 1, wherein the tissue site comprises an intra-facet joint space.

10. A bone graft implant device of claim 1, wherein at least one of the amount of demineralization or area of the demineralized portion is adjustable to impart a desired flexibility to the implant body.

20. A bone graft implant device of claim 1, wherein the implant device comprises 5% to about 50% by weight of demineralized bone based on a total weight of the implant device and the implant device comprises 95% to about 50% by weight of non-demineralized bone based on the total weight of the implant device.

11. A bone graft implant device for treating a facet joint, the device comprising:

an implant body comprising demineralized allograft bone material defining a demineralized portion, the implant body having an outer surface comprising an acid resistant coating configured to mask portions of the outer surface and to allow unmasked portions of the outer surface to be surface demineralized such that surface demineralization is at discrete positions on the implant, the discrete positions being surface demineralized to a depth of about 50 microns to about 5000 microns; and

at least one engagement member protruding from the demineralized portion, the engagement member comprising only mineralized allograft bone material.

12. A bone graft implant device of claim 11, wherein the implant body comprises a disc shape.

13. A bone graft implant device of claim 11, wherein the engagement member is integrally formed with the implant body and comprises at least one protrusion formed on at least one surface of the implant body.

14. A bone graft implant device of claim 11, wherein the implant body further includes an aperture extending through the demineralized portion.

15. A bone graft implant device of claim 14, wherein the engagement member comprises an elongate pin-shaped member configured to be insertable within said aperture.

16. A bone graft implant device of claim 11, wherein the amount of demineralization of the demineralized portion is adjustable to impart a desired flexibility to the implant body.

17. A bone graft implant device for treating a facet joint, the device comprising:

an implant body comprising a demineralized allograft bone material portion, the implant body having an outer surface comprising an acid resistant coating configured to mask portions of the outer surface and to allow unmasked portions of the outer surface to be surface demineralized such that surface demineralization is at discrete positions on the implant, the discrete positions being surface demineralized to a depth of about 50 microns to about 5000 microns; and

at least one engagement member formed to be integral with and protrude from the demineralized allograft bone material portion, said at least one engagement member comprising only mineralized allograft bone material.

18. A bone graft implant device of claim 17, wherein at least one of the amount of demineralization or area of the demineralized allograft bone material portion is adjustable to impart a desired flexibility to the implant body.

19. A bone graft implant device of claim 17, wherein the engagement member comprises at least one protrusion formed on opposing surfaces of the implant body.