Force diffusion spinal hook

• US 7,485,133 B2
• Filed: 07/14/2004
• Issued: 02/03/2009
• Est. Priority Date: 07/14/2004
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Cannon, Bradley J., Trieu, Hai H.
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): Yang; Andrew
• Application Number:
  US10/890,940
• Publication Number:
  US 20060015099A1
• Time in Patent Office: 1,665 Days
• Field of Search: 606/61, 606/86, 606/72, 606/246, 606/250, 606/276, 606/279, 606/302, 606/330, 606/76, 244/71, 245/984, 246/016
• US Class Current: 606/276
• CPC Class Codes: A61B 17/7056 Hooks with specially-designed bone-contacting part

Abstract

A force diffusion hook includes a hook element and a connecting member receiving portion for receiving a connecting member to stabilize a spinal column segment. The hook element defines a receptacle for receiving a bony portion. A force diffusion member extends along the receptacle between the hook element and the bony portion. The force diffusion member is deformable to distribute load between the bony portion and the hook element.

Claims

1. A force diffusion hook, comprising:

a connecting member engaging portion and a hook element extending from said connecting member engaging portion, said hook element including a bone retaining surface defining a receptacle for receiving a bony portion, at least a portion of said bone retaining surface being spaced from said connecting member engaging portion with said receptacle therebetween, and further comprising a deformable force diffusion member extending along said bone retaining surface adjacent said receptacle, wherein said force diffusion member deforms to distribute loading between the bony portion and said hook element, and wherein said force diffusion member further extends along an outer surface of said hook element opposite said receptacle, a portion of said force diffusion member along said outer surface being more deformable in response to a loading than a portion of said first diffusion member along said receptacle.

2. The hook of claim 1, wherein said bone retaining surface includes a curved portion adjacent said connecting member engaging portion.

3. The hook of claim 1, wherein said force diffusion member comprises a sleeve including a passage for receiving said hook element.

4. The hook of claim 3, wherein said sleeve includes a first end and an opposite second end, and said passage extends between said first and second ends.

5. The hook of claim 4, wherein said passage opens at each of said first and second ends.

6. The hook of claim 4, wherein said passage is closed at said second end, said first end of said sleeve being positionable about said hook element with said closed end positioned adjacent a terminal end of said hook element.

7. The hook of claim 4, wherein said force diffusion member includes an extension portion extending from said second end of said sleeve and along a portion of said bone retaining member that is spaced from said connecting member engaging portion and extends along said receptacle.

8. The hook of claim 7, wherein said bone retaining surface includes a curved portion extending from said connecting member engaging portion, said sleeve being positioned about said curved portion.

9. The hook of claim 1, wherein said force diffusion member includes a thickness along said bone retaining surface of at least 50 microns.

10. The hook of claim 1, wherein said force diffusion member is comprised of a material selected from the group consisting of:

silicone, polyurethane, copolymers of silicone and polyurethane, polyetheretherketone, polyester, and UHMWPE.

11. The hook of claim 1, wherein said force diffusion member includes a form selected from the group consisting of:

a solid member, a braided member, a woven member, and a coating.

12. The hook of claim 1, further comprising means for securing said force diffusion member to said hook element.

13. The hook of claim 12, wherein said means for securing said force diffusion member to said hook element is selected from a group consisting of:

gluing, fusing, friction fitting, powder coating, dip coating, spray coating, over molding, and fastening.

14. The hook of claim 1, wherein said force diffusion member is elastic.

15. The hook of claim 1, wherein said hook element is substantially non-deformable in response to said loading of said bony portion.

16. The hook of claim 1, wherein said bone retaining surface includes a curved portion adjacent said connecting member engaging portion and a linear portion extending from said curved portion along said receptacle.

17. A force diffusion hook, comprising:

a connecting member engaging portion and a hook element extending from said connecting member engaging portion, said hook element including a bone retaining surface defining a receptacle for receiving a bony portion, at least a portion of said bone retaining surface being spaced from said connecting member engaging portion with said receptacle therebetween, and further comprising a deformable force diffusion member extending along said bone retaining surface adjacent said receptacle, wherein said force diffusion member deforms to distribute loading between the bony portion and said hook element, wherein said force diffusion member comprises a sleeve including a first end, an opposite second end, and a passage extending between said first and second ends for receiving said hook element, and wherein said force diffusion member includes an extension portion extending from said second end of said sleeve and along a portion of said hook that is spaced from said connecting member engaging portion and extends along said receptacle.

18. The hook of claim 17, wherein said bone retaining surface includes a curved portion adjacent said connecting member engaging portion.

19. The hook of claim 17, wherein said passage opens at each of said first and second ends.

20. The hook of claim 17, wherein said bone retaining surface includes a curved portion extending from said connecting member engaging portion, said sleeve being positioned about said curved portion.

21. The hook of claim 17, wherein said force diffusion member includes a thickness along said bone retaining surface of at least 50microns.

22. The hook of claim 17, wherein said force diffusion member is comprised of a material selected from the group consisting of:

silicone, polyurethane, copolymers of silicone and polyurethane, polyetheretherketone, polyester, and UHMWPE.

23. The hook of claim 17, wherein said force diffusion member includes a form selected from the group consisting of:

a solid member, a braided member, a woven member, and a coating.

24. The hook of claim 17, further comprising means for securing said force diffusion member to said hook element.

25. The hook of claim 24, wherein said means for securing said force diffusion member to said hook element is selected from a group consisting of:

gluing, fusing, friction fitting, powder coating, dip coating, spray coating, over molding, and fastening.

26. The hook of claim 17, wherein said force diffusion member is elastic.

27. The hook of claim 17, wherein said hook element is substantially non-deformable in response to said loading of said bony portion.

28. The hook of claim 17, wherein said bone retaining surface includes a curved portion adjacent said connecting member engaging portion and a linear portion extending from said curved portion along said receptacle.

29. The apparatus of claim 17, wherein said hook element includes a first portion extending transversely to said connecting member engaging portion and a second portion spaced from said connecting member engaging portion and extending transversely to said first portion, said bone retaining surface extending along both said first portion and said second portion, said second portion including first and second side surfaces bounding said bone retaining surface;

and wherein said force diffusion member contacts said first portion and said second portion, said force diffusion member contacting said second portion at said bone retaining surface between but not contacting said side surfaces.

30. A force diffusion hook, comprising:

a connecting member engaging portion and a hook element extending from said connecting member engaging portion, said hook element including a bone retaining surface defining a receptacle for receiving a bony portion, at least a portion of said bone retaining surface being spaced from said connecting member engaging portion with said receptacle therebetween, and further comprising a deformable force diffusion member extending along said bone retaining surface adjacent said receptacle, wherein said force diffusion member comprises a sleeve including a first end, an opposite second end, and a passage extending between said first and second ends for receiving said hook element therein, and wherein said force diffusion member includes an extension portion extending from said second end of said sleeve and along a portion of said hook element that is spaced from said connecting member engaging portion and extends along said receptacle.

31. The hook of claim 30, wherein said bone retaining surface includes a curved portion adjacent said connecting member engaging portion.

32. The hook of claim 30, wherein said passage opens at each of said first and second ends.

33. The hook of claim 30, wherein said bone retaining surface includes a curved portion extending from said connecting member engaging portion, said sleeve being positioned about said curved portion.

34. The hook of claim 30, wherein said force diffusion member includes a thickness along said bone retaining surface of at least 50 microns.

35. The hook of claim 30, wherein said force diffusion member is comprised of a material selected from the group consisting of:

silicone, polyurethane, copolymers of silicone and polyurethane, polyetheretherketone, polyester, and UHMWPE.

36. The hook of claim 30, wherein said force diffusion member includes a form selected from the group consisting of:

a solid member, a braided member, a woven member, and a coating.

37. The hook of claim 30, further comprising means for securing said force diffusion member to said hook element.

38. The hook of claim 37, wherein said means for securing said force diffusion member to said hook element is selected from a group consisting of:

gluing, fusing, friction fitting, powder coating, dip coating, spray coating, over molding, and fastening.

39. The hook of claim 30, wherein said force diffusion member is elastic.

40. The hook of claim 30, wherein said hook element is substantially non-deformable in response to said loading of said bony portion.

41. The hook of claim 30, wherein said bone retaining surface includes a curved portion adjacent said connecting member engaging portion and a linear portion extending from said curved portion along said receptacle.

42. A force diffusion hook, comprising:

a connecting member engaging portion and a hook element extending from said connecting member engaging portion, said hook element including a bone retaining surface defining a receptacle for receiving a bony portion, at least a portion of said bone retaining surface being spaced from said connecting member engaging portion with said receptacle therebetween, and further comprising force diffusing means extending along said bone retaining surface adjacent said receptacle for distributing loading between the bony portion and said hook element, wherein said force diffusing means comprises a sleeve including a first end, an opposite second end and a passage extending between said first and second ends for receiving said hook element therein, and wherein said force diffusing means includes an extension portion extending from said second end of said sleeve and along a portion of said hook element that is spaced from said connecting member engaging portion and extends along said receptacle.

43. The hook of claim 42, wherein said bone retaining surface includes a curved portion adjacent said connecting member engaging portion.

44. The hook of claim 42, wherein said force diffusing means comprises a sleeve having a passage for receiving said hook element therein.

45. The hook of claim 42, wherein said passage opens at each of said first and second ends.

46. The hook of claim 42, wherein said hook element includes a curved portion extending from said connecting member engaging portion, said sleeve extending about said curved portion.

47. The hook of claim 42, wherein said force diffusing means includes a thickness along said bone retaining surface of at least 50microns.

48. The hook of claim 42, wherein said force diffusing means is comprised of a material selected from the group consisting of:

silicone, polyurethane, copolymers of silicone and polyurethane, polyetheretherketone, polyester, and UHMWPE.

49. The hook of claim 42, wherein said force diffusing means is elastic.

50. The hook of claim 42, wherein said hook element is substantially rigid in response to said loading.