초록 ▼

A bone anchor is driven into the pedicle portion of the vertebral body until a shoulder protrusion within the proximal aspect of the anchor abuts the bone surface and prevents further anchor travel into the bone. A feature within the distal aspect of the anchor is actuated producing the emergence of

A bone anchor is driven into the pedicle portion of the vertebral body until a shoulder protrusion within the proximal aspect of the anchor abuts the bone surface and prevents further anchor travel into the bone. A feature within the distal aspect of the anchor is actuated producing the emergence of a distal shoulder protrusion. The latter directly abuts the distal aspect of the pedicle at the pedicle/vertebral body interface. Using this method, the anchor captures the pedicle portion of bone and contains it between the proximal and distal shoulder abutments.

대표청구항 ▼

1. An orthopedic bone anchor assembly, comprising: an elongated outer shank member having external threads, an internal bore aligned along a long axis of the outer shank member, and at least one slot on a distal region of the outer shank member that permits radial expansion of the distal region of t

1. An orthopedic bone anchor assembly, comprising: an elongated outer shank member having external threads, an internal bore aligned along a long axis of the outer shank member, and at least one slot on a distal region of the outer shank member that permits radial expansion of the distal region of the outer shank member;an elongated inner shank member having a threaded distal segment and a proximal segment joined at an intersection, wherein the diameter of the distal segment is greater than the diameter of the proximal segment, and wherein, when the inner shank member is coupled to the outer shank member, at least a portion of the proximal segment is contained within the internal bore of the outer shank member, wherein at least a portion of the distal segment is threaded and positioned distally outside of the internal bore of the outer shank member; anda proximal head member having a threaded bore that engage a threaded proximal portion of the inner shank member, the head member further having a distal abutment surface that abuts a proximal portion of the outer shank member, wherein the head member is at least partially seated within a housing member, wherein the housing member is adapted to receive an interconnecting rod member, wherein the housing member is movable relative to the threaded shank member in at least one plane, and wherein the housing member contains a locking feature that is adapted to secure the interconnecting rod member to the housing member;wherein, a distance between the intersection and the distal abutment surface of the proximal head member varies with rotation of the proximal head member relative to the inner shank member; andwherein rotation of the proximal head member relative to the inner shank member produces (a) longitudinal movement of the inner shank member relative to the outer shank member, (b) advancement of the intersection against the distal region of the outer shank member, and (c) radial expansion of the distal region of the outer shank member. 2. An orthopedic bone anchor assembly, comprising: an elongated outer shank member having external threads, an internal bore aligned along a long axis of the outer shank member, and a distal region having a tapered tip;an elongated inner shank member having a threaded distal segment and a proximal segment joined at an intersection, and wherein the diameter of the threaded distal segment is greater than the diameter of the proximal segment, and wherein, when the inner shank member is coupled to the outer shank member, at least a portion of the proximal segment is contained within the internal bore of the outer shank member and wherein at least a portion of the distal segment includes expansion slots within an outer wall; anda proximal head member having a threaded bore that engages a thread proximal segment of the inner shank and a distal abutment surface that abuts a proximal region of the outer shank member, wherein the head member is at least partially seated within a housing member, wherein the housing member is adapted to receive an interconnecting rod member, wherein the housing member is movable relative to the threaded shank member in at least one plane, and wherein the housing member contains a locking feature that is adapted to secure the interconnecting rod member to the housing member;wherein rotation of the proximal head member relative to the inner shank member produces (a) longitudinal movement of the inner shank member relative to the outer shank member and radial expansion of the distal segment of the inner shank member; andwherein the inner and outer shank members remain attached together and collectively anchored to the bone after the bone anchor assembly is completely implanted in bone. 3. A method for the fixation of an orthopedic implant onto a vertebral bone, comprising: advancing a bone anchor member of a bone screw assembly through a bony surface of a first vertebral body and along a long axis of a pedicle portion of the vertebral bone, wherein the bone screw assembly comprises: (a) an elongated bone anchor member having a shank portion of a first diameter that is adapted to penetrate and engage pedicle portion of the vertebral bone, wherein a threaded distal region of the elongated bone anchor member is adapted to expand within the vertebral bone after advancement of at least a portion of the shank portion distal to the pedicle portion of bone; and(b) an abutment member of a diameter greater than the first diameter of the shank portion, wherein the abutment member is adapted to abut the bony surface of the vertebral bone adjacent to a location where the elongated bone anchor member penetrates the bone;driving the bone screw assembly into the vertebral bone until the abutment member abuts the bony surface of the vertebral bone adjacent to the location where the elongated bone anchor member penetrates the bone;expanding the distal region of the elongated bone anchor member until a segment of the expanded distal region abuts a distal aspect of the pedicle portion of bone; andcapturing the pedicle portion of bone between the expanded distal region of the elongated bone anchor member and the abutment member. 4. A bone fixation assembly, comprising: a threaded shank member adapted to anchor onto bone and having an outer wall that is at least partially threaded, wherein the threaded shank member extends distally along a central axis from a proximal aspect, wherein the threaded shank member comprises at least a proximal threaded shank segment and a distal threaded shank segment, and wherein the proximal and distal threaded shank segments are axially aligned and movable relative to one another along the direction of the central axis;a head segment that is connected to the proximal aspect of the proximal threaded shank segment, wherein the head segment is at least partially seated within a housing member, wherein the housing member is adapted to receive an interconnecting rod member, wherein the housing member is movable relative to the threaded shank member in at least one plane, and wherein the housing member contains a locking feature that is adapted to secure the interconnecting rod member to the housing member;wherein the proximal threaded shank segment is divided into a proximal portion and a distal portion, wherein the distal portion of the proximal threaded shank segment abuts a proximal portion of the distal threaded shank segment, wherein the distal portion of the proximal threaded shank segment contains at least one expansion slot within a portion of the outer wall, wherein the expansion slot permit radial outward expansion of at least a portion of the outer wall of the distal portion of the proximal threaded shank segment. 5. A bone fixation assembly as in claim 4, wherein, when in the expanded state, the distal portion of the proximal threaded shank segment is of greater diameter than the proximal portion of the proximal threaded shank segment. 6. A bone fixation assembly as in claim 4, wherein, when in the expanded state, the distal portion of the proximal threaded shank segment is of greater diameter than at least a part of the distal threaded shank segment. 7. A bone fixation assembly as in claim 4, wherein a most distal aspect of the distal threaded shank segment is tapered in order to facilitate penetration of bone. 8. A bone fixation assembly as in claim 4, wherein the distal portion of the proximal threaded shank segment contains a plurality of expansion slots within a portion of the outer wall. 9. A bone fixation assembly as in claim 4, wherein axial movement of the distal threaded shank segment towards the proximal threaded shank segment along the central axis produces forcible expansion of the expansion slots of the distal portion of the proximal threaded shank segment. 10. A bone fixation assembly as in claim 4, wherein engagement of a threaded segment of a distal threaded shank segment provides a compressive force that drives the proximal and distal threaded shank segments towards one another and expands the expansion slots of the distal portion of the proximal threaded shank segment. 11. A bone fixation assembly as in claim 4, wherein a proximal abutment member is connected to the proximal aspect of the threaded shank member, wherein the abutment member is of greater diameter than the diameter of the threaded shank member, and wherein the abutment member is adapted to abut the bony surface of the vertebral bone adjacent to the location where the shank member anchors to the bone. 12. A bone fixation assembly as in claim 4, wherein the proximal abutment member articulates with the threaded shank member. 13. A bone fixation assembly as in claim 4, wherein the proximal abutment is movable relative to the threaded shank member in at least one plane. 14. A bone fixation assembly as in claim 4, wherein the head segment forms a ball and socket articulation with the inner seat of the housing member. 15. A bone fixation assembly as in claim 4, wherein the bone fixation assembly is at least partially manufactured from a Titanium alloy. 16. A bone fixation assembly as in claim 4, wherein the bone fixation assembly is at least partially manufactured from a memory shape alloy. 17. A bone fixation assembly as in claim 4, wherein the bone fixation assembly has at least one porous in-growth surface that is adapted to promote bone in-growth into the implant surface and establish a mineralized connection between the vertebral bone and the implant. 18. A bone fixation assembly as in claim 4, wherein the shank member of the bone anchor assembly has at least one porous in-growth surface that is adapted to promote bone in-growth into the implant surface and establish a mineralized connection between the vertebral bone and the implant. 19. A bone fixation assembly as in claim 4, wherein at least a portion of the bone anchor assembly is provided with a bioactive coating in order to promote a mineralized connection between the vertebral bone and the implant. 20. A method for the fixation of an orthopedic implant onto a vertebral bone, comprising: advancing a bone anchor assembly through a bony surface of a first vertebral body and along a long axis of a pedicle portion of the vertebral bone, wherein the anchor assembly comprises: a threaded shank member adapted to anchor onto bone and having an outer wall that is at least partially threaded, wherein the threaded shank member extends distally along a central axis from a proximal aspect, wherein the threaded shank member is comprised of at least a proximal threaded shank segment and a distal threaded shank segment, and wherein the proximal and distal threaded shank segments are axially aligned and movable relative to one another along the direction of the central axis; anda head segment that is connected to the proximal aspect of the proximal threaded shank segment, wherein the head segment is at least partially seated within a housing member, wherein the housing member is adapted to receive an interconnecting rod member, wherein the housing member is movable relative to the threaded shank member in at least one plane, and wherein the housing member contains a locking feature that is adapted to secure the interconnecting rod member to the housing member;wherein the proximal threaded shank segment is divided into a proximal portion and a distal portion, wherein the distal portion of the proximal threaded shank segment abuts a proximal portion of the distal threaded shank segment, wherein the distal portion of the proximal threaded shank segment contains at least one expansion slot within a portion of the outer wall, wherein the expansion slot permit radial outward expansion of at least a portion of the outer wall of the distal portion of the proximal threaded shank segment, and wherein, when in the expanded state, the distal portion of the proximal threaded shank segment is of greater diameter than the proximal portion of the proximal threaded shank segment;advancing the bone anchor assembly until the distal end of the distal threaded shank segment rests within the vertebral body;moving the distal threaded shank segment along the central axis and towards the proximal threaded shank segment; andproducing forcible expansion of the expansion slot of the proximal threaded shank segment, wherein, when in the expanded state, the expanded distal portion of the proximal threaded shank segment rests within the vertebral body. 21. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 20, wherein the expanded distal portion of the proximal threaded shank segment rests within the vertebral body but outside of the pedicle portion of bone. 22. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 20, wherein, after full implantation of the bone anchor assembly, the pedicle portion of the vertebral bone is positioned between the expanded distal portion of the proximal threaded shank segment and the housing member. 23. A bone fixation assembly, comprising: a threaded shank member adapted to anchor onto bone and having an outer wall that is at least partially threaded, wherein the threaded shank member extends distally along a central axis from a proximal aspect, wherein the threaded shank member is comprised of at least a proximal threaded shank segment and a distal threaded shank segment, and wherein the proximal and distal threaded shank segments are axially aligned and movable relative to one another along the direction of the central axis; anda head segment that is connected to the proximal aspect of the proximal threaded shank segment, wherein the head segment is at least partially seated within a housing member, wherein the housing member is adapted to receive an interconnecting rod member, wherein the housing member is movable relative to the threaded shank member in at least one plane, and wherein the housing member contains a locking feature that is adapted to secure the interconnecting rod member to the housing member;wherein the distal threaded shank segment is divided into a proximal and a distal portion, wherein the proximal portion of the distal threaded shank segment abuts a distal portion of the proximal threaded shank segment, wherein the proximal portion of the distal threaded shank segment contains at least one expansion slot within a portion of the outer threaded wall, wherein the expansion slot permits radial outward expansion of at least a portion of the outer wall of the proximal portion of the distal threaded shank segment. 24. A bone fixation assembly as in claim 23, wherein, when in the expanded state, the proximal portion of the distal threaded shank segment is of greater diameter than the distal portion of the distal threaded shank segment. 25. A bone fixation assembly as in claim 23, wherein when in the expanded state, the proximal portion of the distal threaded shank segment is of greater radial size than at least a segment of the proximal threaded shank segment. 26. A bone fixation assembly as in claim 23, wherein a most distal aspect of the distal threaded shank segment is tapered in order to facilitate penetration of bone. 27. A bone fixation assembly as in claim 23, wherein the proximal portion of the distal threaded shank segment contains a plurality of expansion slots within a portion of the outer wall. 28. A bone fixation assembly as in claim 23, wherein axial movement of the distal threaded shank segment towards the proximal threaded shank segment along the central axis produces forcible expansion of the expansion slots of the proximal portion of the distal threaded shank segment. 29. A bone fixation assembly as in claim 23, wherein engagement of a threaded segment of the a distal threaded shank segment provides a compressive force that drives the proximal and distal threaded shank segments towards one another and expand the expansion slots of the proximal portion of the distal threaded shank segment. 30. A bone fixation assembly as in claim 23, wherein a proximal abutment member is connected to the proximal aspect of the threaded shank member, wherein the abutment member is of greater diameter than the diameter of the threaded shank member, and wherein the abutment member is adapted to abut the bony surface of the vertebral bone adjacent to the location where the shank member anchors to the bone. 31. A bone fixation assembly as in claim 23, wherein the proximal abutment member articulates with the threaded shank member. 32. A bone fixation assembly as in claim 23, wherein the proximal abutment is movable relative to the threaded shank member in at least one plane. 33. A bone fixation assembly as in claim 23, wherein the head member forms a ball and socket articulation with the inner seat of the housing member. 34. A bone fixation assembly as in claim 23, wherein the bone anchor assembly is at least partially manufactured from a Titanium alloy. 35. A bone fixation assembly as in claim 23, wherein the bone anchor assembly is at least partially manufactured from a memory shape alloy. 36. A bone fixation assembly as in claim 23, wherein the bone anchor assembly has at least one porous in-growth surface that is adapted to promote bone in-growth into the implant surface and establish a mineralized connection between the vertebral bone and the implant. 37. A bone fixation assembly as in claim 23, wherein the shank member of the bone anchor assembly has at least one porous in-growth surface that is adapted to promote bone in-growth into the implant surface and establish a mineralized connection between the vertebral bone and the implant. 38. A bone fixation assembly as in claim 23, wherein at least a segment of the bone anchor assembly is provided with a bioactive coating in order to promote a mineralized connection between the vertebral bone and the implant. 39. A method for the fixation of an orthopedic implant onto a vertebral bone, comprising: advancing a bone anchor assembly through a bony surface of a first vertebral body and along a long axis of a pedicle portion of the vertebral bone, wherein the anchor assembly comprises: a threaded shank member adapted to anchor onto bone and having an outer wall that is at least partially threaded, wherein the threaded shank member extends distally along a central axis from a proximal aspect, wherein the threaded shank member is comprised of at least a proximal threaded shank segment and a distal threaded shank segment, and wherein the proximal and distal threaded shank segments are axially aligned and movable relative to one another along the direction of the central axis; anda head segment that is connected to the proximal aspect of the proximal threaded shank segment, wherein the head segment is at least partially seated within a housing member, wherein the housing member is adapted to receive an interconnecting rod member, wherein the housing member is movable relative to the threaded shank member in at least one plane, and wherein the housing member contains a locking feature that is adapted to secure the interconnecting rod member to the housing member;wherein the distal threaded shank segment is divided into a proximal and a distal portion, wherein the proximal portion of the distal threaded shank segment abuts a distal portion of the proximal threaded shank segment, wherein the proximal portion of the distal threaded shank segment contains at least one expansion slot within a portion of the outer threaded wall, wherein the expansion slot permits radial outward expansion of at least a portion of the outer wall of the proximal portion of the distal threaded shank segment;advancing the bone anchor assembly until the distal end of the distal threaded shank segment rests within the vertebral body;moving the distal threaded shank segment along the central axis and towards the proximal threaded shank segment; andproducing forcible expansion of the expansion slot of the proximal threaded shank segment, wherein, when in the expanded state, the expanded distal portion of the proximal threaded shank segment rests within the vertebral body. 40. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 39, wherein the expanded proximal portion of the distal threaded shank segment rests within the vertebral body. 41. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 39, wherein, after full implantation of the bone anchor assembly, the pedicle portion of the vertebral bone is positioned between the expanded proximal portion of the distal threaded shank segment and the housing member. 42. A method for the fixation of an orthopedic implant onto a vertebral bone, comprising: advancing a shank member of a bone anchor assembly through a bony surface of a first vertebral body and along a long axis of a pedicle portion of the vertebral bone, wherein the bone anchor assembly is comprised of at least a shank member of a first diameter that is adapted to the penetrate and engage a distal aspect of the pedicle portion of the vertebral bone, and wherein the shank member is adapted to expand within the vertebral bone;expanding the shank member so as to form a first abutment surface and positioning the first abutment surface at the distal aspect of the pedicle portion of bonepositioning a second surface to abut the bony surface of the vertebral bone adjacent to the location where the shank member penetrates the vertebral bone, wherein the second abutment surface has diameter greater than the first diameter of the shank member and wherein the first and second abutment surfaces are collectively contained within the bone anchor assembly; andcapturing the pedicle portion of the vertebral bone between the first abutment surface formed by the expanded portion of the shank and the second abutment surface. 43. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 42, wherein the bone anchor assembly is at least partially manufactured from a Titanium alloy. 44. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 42, wherein the bone anchor assembly is at least partially manufactured from a memory shape alloy. 45. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 42, wherein the bone anchor assembly has at least one porous in-growth surface that is adapted to promote bone in-growth into the implant surface and establish a mineralized connection between the vertebral bone and the implant. 46. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 42, wherein the shank member of the bone anchor assembly has at least one porous in-growth surface that is adapted to promote bone in-growth into the implant surface and establish a mineralized connection between the vertebral bone and the implant. 47. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 42, wherein at least a segment of the bone anchor assembly is provided with a bioactive coating in order to promote a mineralized connection between the vertebral bone and the implant. 48. A method for the fixation of an orthopedic implant onto a vertebral bone, comprising: advancing a shank member of a bone anchor assembly distally through a bony surface of a first vertebral body and along a long axis of a pedicle portion of the vertebral bone, wherein the bone anchor assembly is comprised of at least a shank member of a first diameter that is adapted to the penetrate and engage a distal aspect of the pedicle portion of the vertebral bone, and wherein the shank member is adapted to expand within the vertebral bone;expanding the shank member so as to form a first abutment surface inside the vertebral bone;moving the expanded first abutment surface proximally until the first abutment surface is lodged against the distal aspect of the pedicle at an interface between the pedicle and the vertebral body;positioning a second surface to abut the bony surface of the vertebral bone adjacent to the location where the shank member penetrates the vertebral bone; wherein the first and second abutment surfaces are collectively contained within the bone anchor assembly; andcapturing the pedicle portion of the vertebral bone between the first abutment surface formed by the expanded portion of the shank and the second abutment surface. 49. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 48, wherein the bone anchor assembly is at least partially manufactured from a Titanium alloy. 50. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 48, wherein the bone anchor assembly is at least partially manufactured from a memory shape alloy. 51. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 48, wherein the bone anchor assembly has at least one porous in-growth surface that is adapted to promote bone in-growth into the implant surface and establish a mineralized connection between the vertebral bone and the implant. 52. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 48, wherein the shank member of the bone anchor assembly has at least one porous in-growth surface that is adapted to promote bone in-growth into the implant surface and establish a mineralized connection between the vertebral bone and the implant. 53. A method for the fixation of an orthopedic implant onto a vertebral bone as in claim 48, wherein at least a segment of the bone anchor assembly is provided with a bioactive coating in order to promote a mineralized connection between the vertebral bone and the implant.