Apparatus for distributed bone growth stimulation

• US 5,304,210 A
• Filed: 01/28/1992
• Issued: 04/19/1994
• Est. Priority Date: 01/28/1992
• Status: Expired due to Term

• Current Assignee: AMER Technology Limited (AMER International Group Company Limited)
• Original Assignee: AMER Technology Limited (AMER International Group Company Limited)
• Inventors: Crook, David F.
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): Getzow, Scott M.
• Application Number:
  US07/827,002
• Time in Patent Office: 812 Days
• Field of Search: 128/419 F, 128/419 R
• US Class Current: 607/51
• CPC Class Codes: A61B 17/58 for osteosynthesis, e.g. bone plates, screws , setting implements or the like A61B17/14, A61B17/16 take precedence
• CPC Class Codes: A61B 17/70 Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
• CPC Class Codes: A61B 17/80 Cortical plates , i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2002/2821 Bone stimulation by electromagnetic fields or electric current for enhancing ossification
• 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: A61N 1/326 for promoting growth of cells, e.g. bone cells
• CPC Class Codes: A61N 1/3605 Implantable neurostimulators for stimulating central or peripheral nerve system
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

Abstract

Apparatus for promoting healing in a bony structure having an injury is provided. A bone graft is positioned directly on a conductive mesh frame, which is placed over the bone injury site. A retainer is fastened to the conductive mesh frame and sandwiches the bone graft therebetween. Over the retainer a brace is fastened and further secured to the bony structure directly over the site of the injury. The brace effectively applies pressure on the retainer to effect an intimate contact between the fusion bone and the injury site. An electronic module is further mounted to the brace and coupled to the conductive mesh frame to deliver a stimulating energy to the conductive mesh frame.

Claims

1. Apparatus for bone fusion comprising a cage means for substantially enclosing a bone graft at a bone injury site and said cage means adapted to be mounted directly against the bone injury site.

2. The apparatus, as set forth in claim 1, further comprising:

circuit means adapted to be secured near the bone injury site for generating a stimulating energy; and

conductive means for coupling said circuit means and said cage means, said cage means receiving and being energized by said stimulating energy.

3. The apparatus, as set forth in claim 1, wherein said cage means comprises:

a conductive mesh frame; and

a retainer fastened to said conductive mesh frame and sandwiching a plurality of bone grafts therebetween.

4. The apparatus, as set forth in claim 1, further comprising a brace detachably coupled to said cage means and further adapted to be detachably secured over the bone injury site, said brace applying pressure against said cage means toward the bone injury site to effect an intimate contact therebetween.

5. The apparatus, as set forth in claim 4, wherein a circuit means, adapted to be secured near the bone injury site for generating and monitoring a stimulating energy, is coupled to and housed in said brace.

6. The apparatus, as set forth in claim 5, wherein said brace defines a cavity adapted for housing said circuit means.

7. The apparatus, as set forth in claim 4, wherein said brace further comprises a contoured surface adapted to be closely matched to the contour of a bony structure at and surrounding the bone injury site.

8. The apparatus, as set forth in claim 4, wherein said brace further comprises at least one portion coming into contact with at least one point on a bony structure surrounding the bone injury site, the contour of said portion being adapted to be closely matched to the contact point on said bony structure.

9. The apparatus, as set forth in claim 1, wherein said cage means is substantially flexible.

10. Apparatus for promoting healing in a bony structure having an injury, comprising:

a conductive mesh frame;

a bone graft positioned directly on said conductive mesh frame;

a retainer fastened to said conductive mesh frame and sandwiching said bone graft therebetween;

a brace fastened to said retainer and further adapted to be secured to said bony structure directly over the site of the injury, said brace effectively pressing said conductive mesh frame, said bone graft and said retainer against the injury site and stabilizing said bony structure; and

an electronic module being mounted to said brace and coupled to said conductive mesh frame, said electronic module housing an electronic circuit for delivering a stimulating energy to said conductive mesh frame.

11. The apparatus, as set forth in claim 10, wherein said injury is between a plurality of vertebrae, said brace adapted to be fastened to said vertebrae and holding said conductive mesh bone graft directly over the site of the injury.

12. The apparatus, as set forth in claim 10, wherein said conductive mesh frame is substantially flexible.

13. The apparatus, as set forth in claim 10, wherein said brace further comprises a contoured surface adapted to be closely matched to the contour of said bony structure.

14. The apparatus, as set forth in claim 13, wherein said brace further comprises at least one portion coming into contact with at least one point on said bony structure, the contour of said portion being adapted to be closely matched to the contour of the said bony structure at the contact point.

15. The apparatus, as set forth in claim 10, wherein said retainer is fastened to said conductive mesh frame with fasteners.

16. The apparatus, as set forth in claim 10, wherein said brace is fastened to said retainer with fasteners.

17. The apparatus, as set forth in claim 10, wherein said brace is adapted to be secured to said bony structure with screws.

18. The apparatus, as set forth in claim 10, wherein said brace further comprises a rod having a hook-like member on each end of the rod, said hook-like members being adapted for hooking onto designated features of said bony structure and securing said brace thereto.

19. Apparatus for promoting healing in a bony structure having an injury, comprising:

a bone graft;

a conductive mesh housing for containing said bone graft;

a brace overlying said conductive mesh housing and fastened thereto, and further adapted to be secured to said bony structure directly over the site of the injury, said brace effectively pressing said conductive mesh housing and said bone graft against the injury site and immobilizing said bony structure; and

an electronic module being mounted to said brace and coupled to said conductive mesh housing, said electronic module delivering a stimulating energy to said conductive mesh housing.

20. The apparatus, as set forth in claim 19, wherein said injury is a segmental instability between a plurality of spinal vertebrae, said brace adapted to be fastened to said vertebrae and holding said conductive mesh housing and bone graft directly over the site of said segmental instability.

21. The apparatus, as set forth in claim 19, wherein said conductive mesh housing is substantially flexible.

22. The apparatus, as set forth in claim 19, wherein said brace further comprises a contoured surface adapted to be closely matched to the contour of said bony structure.

23. The apparatus, as set forth in claim 22, wherein said brace further comprises at least one portion coming into contact with at least one point on said bony structure, the contour of said portion being adapted to be closely matched to the contour of the said bony structure at the contact point.

24. The apparatus, as set forth in claim 19, wherein said brace is fastened to said conductive mesh housing with fasteners.

25. The apparatus, as set forth in claim 19, wherein said brace is adapted to be secured to said bony structure with screws.

26. The apparatus, as set forth in claim 19, wherein said brace further comprises a rod having a hook-like member on each end of the rod, said hook-like members being adapted for hooking onto designated features of said bony structure and securing said brace thereto.

27. Apparatus for promoting healing in a bony structure having injury, comprising:

a bone graft;

conductive means having a plurality of small openings for retaining said bone graft;

a brace adapted to fasten said conductive means and said bone graft to said bony structure directly over the site of injury, said brace adapted to effectively immobilize said bony structure; and

an electronic circuit mounted to said brace for delivering a stimulating energy to said conductive means.

28. The apparatus, as set forth in claim 27, wherein said injury is between a plurality of vertebrae, said brace adapted to be fastened to said vertebrae and holding said conductive means and a plurality of bone grafts directly over the injury site.

29. The apparatus, as set forth in claim 27, wherein said conductive means is substantially flexible.

30. The apparatus, as set forth in claim 27, wherein said brace further comprises a contoured surface adapted to be closely matched to the contour of said bony structure.

31. The apparatus, as set forth in claim 30, wherein said brace further comprises at least one portion coming into contact with at least one point on said bony structure, the contour of said portion being adapted to be closely matched to the contour of the said bony structure at the contact point.

32. The apparatus, as set forth in claim 27, wherein said brace is fastened to said conductive means with fasteners.

33. The apparatus, as set forth in claim 27, wherein said brace is adapted to be secured to said bony structure with screws.

34. The apparatus, as set forth in claim 27, wherein said brace further comprises a rod having a hook-like member on each end of the rod, said hook-like members being adapted for hooking onto designated features of said bony structure and securing said brace thereto.