Bone anchor and methods of using the same

• US 20040225292A1
• Filed: 05/05/2003
• Published: 11/11/2004
• Est. Priority Date: 05/05/2003
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Sasso, Ricardo C., Foley, Kevin T.
• Granted Patent: US 7,354,442 B2
• Time in Patent Office: Days
• US Class Current: 606/73
• CPC Class Codes: A61B 17/7098 wherein the implant is permeable or has openings, e.g. fenestrated screw hollow surgical screws A61B17/864
• CPC Class Codes: A61B 17/8615 at the central region of the screw head
• CPC Class Codes: A61B 17/864 hollow, e.g. with socket or cannulated
• CPC Class Codes: A61B 17/8811 characterised by the introducer tip, i.e. the part inserted into or onto the bone
• CPC Class Codes: A61B 17/8816 characterised by the conduit, e.g. tube, along which fluid flows into the body or by conduit connections
• CPC Class Codes: A61B 17/8888 at its central region

Abstract

A bone anchor comprising a bone engaging portion and an elongate guiding portion. In one embodiment, the bone engaging portion includes a cannula passage extending at least partially therethrough and at least one transverse opening in communication with the cannula passage. The elongate guiding portion extends from the bone engaging portion and is configured to guide a device into engagement with the bone engaging portion.

Claims

1. A bone anchor, comprising:

a bone engaging portion having a proximal end portion and a distal end portion, said bone engaging portion including a cannula passage extending at least partially therethrough from said proximal end portion toward said distal end portion and at least one transverse opening in communication with said cannula passage; and

an elongate guiding portion extending from said proximal end portion of said bone engaging portion and adapted to guide a device into engagement with said bone engaging portion.

2. The bone anchor of claim 1, wherein said cannula passage extends partially through said bone engaging portion.

3. The bone anchor of claim 1, wherein each of said at least one transverse opening is disposed along a distal end portion of said bone engaging portion.

4. The bone anchor of claim 3, wherein each of said at least one transverse opening is disposed along a distal-most one third of said bone engaging portion.

5. The bone anchor of claim 1, wherein said bone engaging portion defines a plurality of said at least one transverse opening in communication with said cannula passage.

6. The bone anchor of claim 1, wherein said elongate guiding portion is configured to releasably engage said bone engaging portion to allow selective removal of said elongate guiding portion from said bone engaging portion.

7. The bone anchor of claim 6, wherein said elongate guiding portion is configured to threadingly engage said bone engaging portion.

8. The bone anchor of claim 1, wherein said elongate guiding portion is configured to engage said bone engaging portion to allow angular displacement of said elongate guiding portion relative to said bone engaging portion.

9. The bone anchor of claim 1, wherein said elongate guiding portion defines an axial passageway extending therethrough and communicating with said cannula passage;

and

further comprising a material delivered from said axial passageway, into said cannula passage and out said at least one transverse opening.

10. The bone anchor of claim 1, wherein one of said bone engaging portion and said elongate guiding portion includes a shaped end portion, another of said bone engaging portion and said elongate guiding portion including a shaped recess configured to receive said shaped end portion.

11. The bone anchor of claim 10, wherein said shaped end portion and said shaped recess each have an at least partially spherical configuration.

12. The bone anchor of claim 10, wherein said shaped end portion and said shaped recess each have an at least partially cylindrical configuration.

13. The bone anchor of claim 10, wherein said shaped end portion comprises a spherical shaped ball and wherein said shaped recess comprises a spherical shaped socket.

14. The bone anchor of claim 13, wherein said spherical shaped ball is press fit into said spherical shaped socket to releasably engage said elongate guiding portion with said bone engaging portion.

15. The bone anchor of claim 1, further comprising a material deliverable into said cannula passage and out said at least one transverse opening.

16. The bone anchor of claim 15, wherein said material comprises bone cement.

17. The bone anchor of claim 15, wherein said material comprises a bone growth promoting substance.

18. The bone anchor of claim 17, wherein said bone growth promoting substance comprises a bone morphogenic protein.

19. The bone anchor of claim 15, wherein the device comprises an injector adapted to inject said material into said cannula passage and out said at least one transverse opening.

20. The bone anchor of claim 15, wherein the device comprises a tubular member adapted to convey said material into said cannula passage and out said at least one transverse opening.

21. The bone anchor of claim 20, wherein said tubular member is adapted to threadingly engage said proximal end portion of said bone engaging portion.

22. The bone anchor of claim 1, wherein the device comprises a surgical instrument.

23. The bone anchor of claim 1, wherein the device comprises a spinal implant.

24. The bone anchor of claim 1, wherein said elongate guiding portion is sized to extend outside of a patient'"'"'s body when said bone engaging portion is engaged to bone.

25. A bone anchor, comprising:

a bone engaging portion having a proximal end portion and a distal end portion, said bone engaging portion including means for delivering material from said proximal end portion to a location laterally adjacent said bone engaging portion; and

means for guiding a device into engagement with said bone engaging portion.

26. The bone anchor of claim 25, further comprising means for releasably engaging said means for guiding to said bone engaging portion to allow selective removal therefrom.

27. The bone anchor of claim 25, further comprising means for allowing angular displacement between said means for guiding and said bone engaging portion.

28. The bone anchor of claim 25, further comprising means for conveying material to said proximal end portion of said bone engaging portion.

29. The bone anchor of claim 25, wherein said means for guiding extends outside of a patient'"'"'s body when said bone engaging portion is engaged to bone.

30. A bone anchor, comprising:

a bone engaging portion having a proximal end portion and a distal end portion; and

an elongate guiding portion adapted to engage said proximal end portion of said bone engaging portion so as to allow angular displacement of said elongate guiding portion relative to said bone engaging portion, said elongate guiding portion adapted to guide a device into engagement with said bone engaging portion.

31. The bone anchor of claim 30, wherein one of said bone engaging portion and said elongate guiding portion includes a shaped end portion, another of said bone engaging portion and said elongate guiding portion including a shaped recess configured to receive said shaped end portion so as to allow said angular displacement.

32. The bone anchor of claim 31, wherein said shaped end portion and said shaped recess each have an at least partially spherical configuration.

33. The bone anchor of claim 31, wherein said shaped end portion is configured for releasable engagement within said shaped recess so as to allow selective separation of said elongate guiding portion from said bone engaging portion.

34. The bone anchor of claim 30, wherein said bone engaging portion includes a cannula passage extending at least partially therethrough from said proximal end portion toward said distal end portion and at least one transverse opening in communication with said cannula passage.

35. A surgical method, comprising:

providing a bone anchor having a bone engaging portion and an elongate guiding portion, the bone engaging portion having a proximal end portion and a distal end portion and including a cannula passage extending at least partially therethrough from the proximal end portion toward the distal end portion and at least one transverse opening in communication with the cannula passage, the elongate guiding portion extending from the proximal end portion of the bone engaging portion;

anchoring the bone engaging portion to bone; and

guiding a device along the elongate guiding portion and into engagement with the bone engaging portion.

36. The method of claim 35, wherein the elongate guiding portion is releasably engaged with the bone engaging portion;

and

wherein the method further comprises selectively removing the elongate guiding portion from the bone engaging portion subsequent to the guiding.

37. The method of claim 36, wherein one of the bone engaging portion and the elongate guiding portion includes a shaped end portion, another of the bone engaging portion and the elongate guiding portion including a shaped recess configured to receive the shaped end portion, the shaped end portion being releasably engaged within the shaped recess;

and

wherein the removing comprises disengaging the shaped end portion from the shaped recess.

38. The method of claim 37, wherein the shaped end portion is threadingly engaged within the shaped recess;

and

wherein the disengaging comprises unthreading the shaped end portion from the shaped recess.

39. The method of claim 35, wherein one of the bone engaging portion and the elongate guiding portion includes a shaped end portion, another of the bone engaging portion and the elongate guiding portion including a shaped recess configured to receive the shaped end portion, the shaped end portion being engaged within the shaped recess to allow angular displacement of the elongate guiding portion relative to said bone engaging portion;

and

wherein the method further comprises adjusting the angular orientation of the elongate guiding portion relative to the bone engaging portion.

40. The method of claim 35, further comprising:

delivering a material into the cannula passage; and

dispensing the material out the at least one transverse opening to a location laterally adjacent the bone engaging portion.

41. The method of claim 40, wherein the elongate guiding portion defines an axial passageway extending therethrough;

and

wherein the delivering comprise conveying the material through the axial passageway and into the cannula passage.

42. The method of claim 40, wherein the device comprises a tubular member;

and

wherein the delivering comprise conveying the material through the tubular member and into the cannula passage.

43. The method of claim 35, wherein the guiding comprises slidingly advancing the device along an outer surface of the elongate guiding portion.

44. The method of claim 35, wherein the guiding comprises advancing the device along the elongate guiding portion from a location outside a patient'"'"'s body to a location adjacent the bone engaging portion.

45. A surgical method, comprising:

providing a bone anchor having a proximal end portion and a distal end portion, the bone anchor including a cannula passage extending at least partially therethrough from the proximal end portion toward the distal end portion and at least one transverse opening communicating with the cannula passage;

anchoring the bone anchor to a vertebral body with the at least one transverse opening positioned adjacent a facet capsule of the vertebral body;

delivering a material into the cannula passage; and

dispensing the material out the at least one transverse opening and into the facet capsule.

46. The method of claim 45, wherein the cannula passage extends partially through the bone anchor;

and

wherein the dispensing comprises dispensing the material entirely out the at least one transverse opening and into the facet capsule.

47. The method of claim 45, wherein each of the at least one transverse opening is disposed along the distal end portion of the bone anchor.

48. The method of claim 45, wherein the material comprises a bone cement.

49. The method of claim 45, wherein the material comprises a bone growth promoting substance.

50. The method of claim 49, wherein the bone growth promoting substance comprises a bone morphogenic protein.