Interbody spinal fusion implant having an anatomically conformed trailing end
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61F-002/44
A61F-002/46
A61F-002/30
A61F-002/28
출원번호
US-0792679
(2001-02-22)
등록번호
US-8882835
(2014-11-11)
발명자
/ 주소
Michelson, Gary K.
출원인 / 주소
Warsaw Orthopedic, Inc.
대리인 / 주소
Martin & Ferraro, LLP
인용정보
피인용 횟수 :
1인용 특허 :
148
초록▼
An interbody spinal fusion implant adapted for placement at least in part across an intervertebral space formed across a disc space between two adjacent vertebral bodies and for penetrating engagement into each of those vertebral bodies, the implant having a trailing end adapted to sit upon and not
An interbody spinal fusion implant adapted for placement at least in part across an intervertebral space formed across a disc space between two adjacent vertebral bodies and for penetrating engagement into each of those vertebral bodies, the implant having a trailing end adapted to sit upon and not protrude from the anterolateral peripheral rim of bone of the vertebral body.
대표청구항▼
1. A manufactured preformed interbody spinal fusion implant for insertion at least in part across a surgically corrected height of a disc space between two adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect, a posterior aspect, and to each side a lateral aspec
1. A manufactured preformed interbody spinal fusion implant for insertion at least in part across a surgically corrected height of a disc space between two adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect, a posterior aspect, and to each side a lateral aspect, said implant comprising: a leading end for insertion into the disc space, an opposite trailing end, a lateral side and an opposite medial side, said sides connecting said leading and trailing ends, said implant having a length between said leading end and said trailing end and a maximum width as measured from said lateral side to said medial side transverse to the length of said implant;opposed arcuate portions adapted for placement toward and into the adjacent vertebral bodies, said implant having a maximum height between said opposed arcuate portions defining an implant maximum height greater than the surgically corrected height of the disc space into which said implant is to be implanted, the maximum height of said implant being transverse to the maximum width of said implant, said opposed arcuate portions each extending from said lateral side to said medial side along the maximum width of said implant; anda mid-longitudinal axis passing through said leading and trailing ends, the mid-longitudinal axis being perpendicular to and bisecting each of the maximum height and the maximum width of said implant into equal parts, said opposed arcuate portions each including a convex portion across the mid-longitudinal axis of said implant in a plane transverse to the mid-longitudinal axis of said implant, said opposed arcuate portions forming part of the same circle, the circle having a diameter substantially equal to said implant maximum height, each of said opposed arcuate portions having at least one opening, said openings being in communication with one another to permit for the growth of bone from adjacent vertebral body to adjacent vertebral body through said implant, said trailing end having an exterior surface, a majority of said exterior surface being linear from one of said opposed arcuate portions to the other of said opposed arcuate portions across the maximum height of said implant, said trailing end including a curved portion in a plane parallel to the mid-longitudinal axis of said implant, said curved portion extending from said medial side and across the mid-longitudinal axis of said implant, said curved portion adapted to conform to the peripheral contour of the vertebral bodies adjacent the disc space in which said implant is implanted, the length of said implant having between said leading end and said trailing end adapted to permit at least a portion of said implant proximate said trailing end and at least a portion of said implant proximate said leading end between said medial side and the mid-longitudinal axis to each overlie at least the apophyseal rim of the adjacent vertebral bodies when said implant is implanted in the disc space, said implant having a junction of said lateral side and said leading end and a junction of said lateral side and said trailing end not substantially protruding from the vertebral bodies when implanted in the disc space. 2. The implant of claim 1, wherein said implant includes a maximum length and a minimum length, said minimum length being located along one of said sides. 3. The implant of claim 1, further comprising at least one protrusion extending from at least one of said opposed arcuate portions for engaging at least one of the adjacent vertebral bodies to maintain said implant within the disc space. 4. The implant of claim 3, wherein said protrusion comprises a thread for engaging each of the adjacent vertebral bodies. 5. The implant of claim 4, wherein said thread is continuous and uninterrupted. 6. The implant of claim 3, wherein said protrusion comprises a ridge. 7. The implant of claim 1, further comprising a plurality of surface roughenings for engaging the adjacent vertebral bodies and for maintaining said implant in place, said surface roughenings being present on at least a portion of said opposed arcuate portions. 8. The implant of claim 1, wherein each of said opposed arcuate portions comprises an interior surface, said interior surfaces being spaced apart to define a hollow interior in communication with said openings. 9. The implant of claim 1, wherein said opposed arcuate portions have a porous surface. 10. The implant of claim 1, wherein said implant is formed of a material other than bone. 11. The implant of claim 10, wherein said implant material is selected from the group consisting of surgical quality titanium and its alloys, cobalt chrome alloy, tantalum, any metal or alloy suitable for the intended purpose, any ceramic material suitable for the intended purpose, any plastic or composite material suitable for the intended purpose. 12. The implant of claim 1, wherein at least a portion of said leading end is tapered for facilitating insertion of the implant between the two adjacent vertebral bodies. 13. The implant of claim 1, wherein said opposed arcuate portions are in a diverging relationship at least in part to each other for allowing angulation of the adjacent vertebral bodies relative to each other. 14. The implant of claim 1, wherein said opposed arcuate portions are generally in a converging relationship from the trailing end to the leading end to each other for allowing angulation of the adjacent vertebral bodies relative to each other. 15. The implant of claim 1, wherein said implant is configured to require an element of rotation for proper insertion. 16. The implant of claim 1, wherein at least a portion of said implant is bioresorbable. 17. The implant of claim 1, in combination with an osteogenic material. 18. The implant of claim 17, wherein said osteogenic material includes at least one of bone, coral, bone morphogenetic protein, and genes coding for the production of bone. 19. The implant of claim 1, in combination with an instrument for inserting said implant at least in part into the disc space. 20. The implant of claim 1, wherein the maximum height is substantially equal to the maximum width. 21. The implant of claim 1, wherein each of said opposed arcuate portions include a plurality of openings. 22. The implant of claim 1, wherein at least a portion of said trailing end extends a distance further rearward on one side of the mid-longitudinal axis than another side of the mid-longitudinal axis relative to the first plane. 23. The implant of claim 1, further comprising a thread for engaging each of the adjacent vertebral bodies, a portion of said thread being located a distance from said leading end greater than the length of one of said sides. 24. The implant of claim 1, wherein said leading end is curved from side to side across the width of said implant. 25. The implant of claim 24, wherein said leading end has a radius of curvature that is different from a radius of curvature of said curved portion of said trailing end. 26. The implant of claim 1, wherein said lateral side has a maximum length and said medial side has a maximum length greater than the maximum length of said lateral side. 27. The implant of claim 1, wherein said curved portion of said trailing end of said implant is non-threaded. 28. The implant of claim 1, wherein said opposed arcuate portions and said sides form a unitary structure. 29. The implant of claim 1, wherein said leading end includes a curved portion in a plane parallel to the mid-longitudinal axis of said implant extending from said medial side and across the mid-longitudinal axis of said implant. 30. A manufactured preformed interbody spinal fusion implant for insertion at least in part across a surgically corrected height of a disc space between two adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect, a posterior aspect, and to each side a lateral aspect, said implant comprising: a leading end for insertion into the disc space, an opposite trailing end, a lateral side and an opposite medial side, said sides connecting said leading and trailing ends, said implant having a length between said leading end and said trailing end and a maximum width as measured from said lateral side to said medial side transverse to the length of said implant;opposed arcuate portions adapted for placement toward and into the adjacent vertebral bodies, said implant having a maximum height between said opposed arcuate portions defining an implant maximum height greater than the surgically corrected height of the disc space into which said implant is to be implanted, the maximum height of said implant being transverse to the maximum width of said implant, said opposed arcuate portions each extending from said lateral side to said medial side along the maximum width of said implant; anda mid-longitudinal axis passing through said leading and trailing ends, the mid-longitudinal axis being perpendicular to and bisecting each of the maximum height and the maximum width of said implant into equal parts, said opposed arcuate portions each including a convex portion across the mid-longitudinal axis of said implant in a plane transverse to the mid-longitudinal axis of said implant, said opposed arcuate portions forming part of the same circle, the circle having a diameter substantially equal to said implant maximum height, each of said opposed arcuate portions having at least one opening, said openings being in communication with one another to permit for the growth of bone from adjacent vertebral body to adjacent vertebral body through said implant,said trailing end being asymmetrical in a cross sectional plane transverse to the mid-longitudinal axis, said trailing end having an outer perimeter that curves at least in part along a plane transverse to the mid-longitudinal axis, said trailing end including a curved portion in a plane parallel to the mid-longitudinal axis of said implant, said curved portion extending from said medial side and across the mid-longitudinal axis of said implant, said curved portion adapted to conform to the peripheral contour of the vertebral bodies adjacent the disc space in which said implant is implanted, the length of said implant between said leading end and said trailing end adapted to permit at least a portion of said implant proximate said trailing end and at least a portion of said implant proximate said leading end between said medial side and the mid-longitudinal axis to each overlie at least the apophyseal rim of the adjacent vertebral bodies when said implant is implanted in the disc space, said implant having a junction of said lateral side and said leading end and a junction of said lateral side and said trailing end not substantially protruding from the vertebral bodies when implanted in the disc space. 31. The implant of claim 30, wherein said implant has a maximum length and a minimum length, said minimum length being located along one of said sides. 32. The implant of claim 30, further comprising at least one protrusion extending from at least one of said opposed arcuate portions for engaging at least one of the adjacent vertebral bodies to maintain said implant within the disc space. 33. The implant of claim 32, wherein said protrusion comprises a thread for engaging each of the adjacent vertebral bodies. 34. The implant of claim 33, wherein said thread is continuous and uninterrupted. 35. The implant of claim 32, wherein said protrusion comprises a ridge. 36. The implant of claim 30, further comprising a plurality of surface roughenings for engaging the adjacent vertebral bodies and for maintaining said implant in place, said surface roughenings being present on at least a portion of said opposed arcuate portions. 37. The implant of claim 30, wherein each of said opposed arcuate portions comprises an interior surface, said interior surfaces being spaced apart to define a hollow interior in communication with said openings. 38. The implant of claim 30, wherein said opposed arcuate portions have a porous surface. 39. The implant of claim 30, wherein said implant is formed of a material other than bone. 40. The implant of claim 39, wherein said implant material is selected from the group consisting of surgical quality titanium and its alloys, cobalt chrome alloy, tantalum, any metal or alloy suitable for the intended purpose, any ceramic material suitable for the intended purpose, any plastic or composite material suitable for the intended purpose. 41. The implant of claim 30, wherein at least a portion of said leading end is tapered for facilitating insertion of the implant between the two adjacent vertebral bodies. 42. The implant of claim 30, wherein said opposed arcuate portions are in a diverging relationship at least in part to each other for allowing angulation of the adjacent vertebral bodies relative to each other. 43. The implant of claim 30, wherein said opposed arcuate portions are generally in a converging relationship from the trailing end to the leading end to each other for allowing angulation of the adjacent vertebral bodies relative to each other. 44. The implant of claim 30, wherein said implant is configured to require an element of rotation for proper insertion. 45. The implant of claim 30, wherein at least a portion of said implant is bioresorbable. 46. The implant of claim 30, in combination with an osteogenic material. 47. The implant of claim 46, wherein said osteogenic material includes at least one of bone, coral, bone morphogenetic protein, and genes coding for the production of bone. 48. The implant of claim 30, in combination with an instrument for inserting said implant at least in part into the disc space. 49. The implant of claim 30, wherein the maximum height is substantially equal to the maximum width. 50. The implant of claim 30, wherein the entire outer perimeter of said trailing end is curved. 51. The implant of claim 30, wherein each of said opposed arcuate portions include a plurality of openings. 52. The implant of claim 30, wherein at least a portion of said trailing end extends a distance further rearward on one side of the mid-longitudinal axis than another side of the mid-longitudinal axis relative to a transverse cross sectional plane perpendicular to the mid-longitudinal axis. 53. The implant of claim 30, further comprising a thread for engaging each of the adjacent vertebral bodies, a portion of said thread being located a distance from said leading end greater than the length of one of said sides. 54. The implant of claim 30, wherein said leading end is curved from side to side across the width of said implant. 55. The implant of claim 54, wherein said leading end has a radius of curvature that is different from a radius of curvature of said curved portion of said trailing end. 56. The implant of claim 30, wherein said lateral side has a maximum length and said medial side has a maximum length greater than the maximum length of said lateral side. 57. The implant of claim 30, wherein said curved portion of said trailing end of said implant is non-threaded. 58. The implant of claim 30, wherein said opposed arcuate portions and said sides form a unitary structure. 59. The implant of claim 30, wherein said leading end includes a curved portion in a plane parallel to the mid-longitudinal axis of said implant extending from said medial side and across the mid-longitudinal axis of said implant.
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