IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0396727
(2006-04-03)
|
등록번호 |
US-8292957
(2012-10-23)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
162 |
초록
▼
An interbody spinal implant is formed of cortical bone adapted for placement across an intervertebral space formed across the height of a disc space between two adjacent vertebral bodies. An asymmetrical leading end on the implant is adapted to sit upon the peripheral areas, such as the apophyseal r
An interbody spinal implant is formed of cortical bone adapted for placement across an intervertebral space formed across the height of a disc space between two adjacent vertebral bodies. An asymmetrical leading end on the implant is adapted to sit upon the peripheral areas, such as the apophyseal rim and the apophyseal rim area, of the vertebral end plate region of the vertebral bodies without protruding therefrom. The asymmetrical leading end allows for the safe use of an implant of maximum length for the implantation space into which it is installed. The implant can also include an asymmetric trailing end adapted to sit upon the more peripheral areas of the vertebral end plate region of the vertebral bodies.
대표청구항
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1. An interbody spinal implant for insertion at least in part across a surgically corrected height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies each having an anterior aspect, a posterior aspect, and an endplate having an apophyseal rim proximate the perim
1. An interbody spinal implant for insertion at least in part across a surgically corrected height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies each having an anterior aspect, a posterior aspect, and an endplate having an apophyseal rim proximate the perimeter of the endplate, said implant comprising: a leading end for insertion first into the disc space, a trailing end opposite said leading end, and therebetween a length along a mid-longitudinal axis of said implant, said leading end being asymmetrical;opposed upper and lower portions between said leading and trailing ends adapted to be placed within the disc space to contact and support the adjacent vertebral bodies, said opposed upper and lower portions being arcuate transverse to the mid-longitudinal axis of said implant along at least a portion of the length of said implant, each of said opposed upper and lower portions having at least one opening therein to permit for the growth of bone from adjacent vertebral body to adjacent vertebral body through said implant, said implant being formed of bone;an interior facing side wall, an exterior facing side wall opposite said interior side wall, and a maximum width therebetween, the maximum width of said implant being less than approximately one-half of a maximum width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said implant having a maximum height transverse to and greater than the maximum width of said implant, said leading end having a curved portion extending from one of said side walls across more than one-half of the maximum width of said implant in a plane dividing said implant into an upper half and lower half, the curved portion having a constant radius of curvature, said interior and exterior side walls being between said opposed upper and lower portions and said leading and trailing ends, said exterior side wall being arcuate in a vertical plane bisecting the length of said implant, said exterior side wall forming part of the same circle with said opposed upper and lower portions, each of said opposed upper and lower portions having a vertebral body contacting surface between said at least one opening and at least one of said interior side wall and said exterior side wall, each of said vertebral body contacting surfaces being adapted to be placed toward one of the adjacent vertebral bodies, said opposed upper and lower portions being spaced apart to define a hollow interior therebetween in communication with said openings; andsaid implant having a minimum length as measured from said leading end to said trailing end so that said leading end and said trailing end of said implant are adapted to rest upon portions of the apophyseal rim when implanted, said implant being adapted to be wholly contained within the disc space when implanted. 2. The implant of claim 1, wherein said leading and trailing ends each have a radius of curvature, the radius of curvature of said leading end being different from the radius of curvature of said trailing end. 3. The implant of claim 2, wherein the radius of curvature of said leading end is greater than the radius of curvature of said trailing end. 4. The implant of claim 1, further comprising at least one protrusion extending from at feast one of said opposed upper and lower portions for engaging at least one of the adjacent vertebral bodies to maintain said implant within the disc space. 5. The implant of claim 4, wherein said protrusion comprises a ridge. 6. The implant of claim 1, in combination with a fusion promoting substance. 7. The implant of claim 6, wherein said fusion promoting substance is at least one of bone, morphogenetic protein, and genes coding for the production of bone. 8. The implant of claim 1, wherein said curved portion extends from said exterior facing side wall beyond the mid-longitudinal axis of said implant. 9. The implant of claim 1, wherein at least a portion of said opposed upper and lower portions are generally in a converging relationship to each other from trailing end to leading end for allowing angulation of the adjacent vertebral bodies relative to each other. 10. The implant of claim 1, wherein said opposed upper and lower portions have at least two openings therein. 11. The implant of claim 1, wherein said implant is adapted for insertion from the posterior aspect of the vertebral bodies and said leading end is configured to conform to the anatomic contour of at least a portion of the anterior aspect of the vertebral bodies. 12. The implant of claim 1, wherein said implant is adapted for insertion from the anterior aspect of the vertebral bodies and said leading end is configured to conform to the anatomic contour of at least a portion of the posterior aspect of the vertebral bodies. 13. The implant of claim 1, wherein said trailing end is generally symmetrical relative to the mid-longitudinal axis. 14. The implant of claim 1, further comprising a plurality of non-threaded surface projections that cover said upper and lower portions along a majority of the length of said implant. 15. The implant of claim 1, wherein the maximum height of said implant is greater than the maximum width of said implant along the entire length of said implant. 16. The implant of claim 1, wherein said interior side wall has a flat portion adapted to be oriented toward another implant when inserted within the disc space. 17. An interbody spinal implant for insertion at least in part across a surgically corrected height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies each having an anterior aspect and a posterior aspect, said implant comprising: a leading end for insertion first into the disc space, a trailing end opposite said leading end, and therebetween a length along a mid-longitudinal axis of said implant, said leading end being asymmetrical;opposed portions between said leading and trailing ends adapted to be placed within the disc space to contact and support the adjacent vertebral bodies, said opposed portions being arcuate transverse to the mid-longitudinal axis of said implant along at least a portion of the length of said implant, each of said opposed portions having at least one opening therein to permit for the growth of bone from adjacent vertebral body to adjacent vertebral body through said implant, said implant being formed of bone;an interior facing side wall, an exterior facing side wall opposite said interior side wall, and a maximum width therebetween, the maximum width of said implant being less than approximately one-half of a maximum width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said implant having a maximum height transverse to and greater than the maximum width of said implant, said leading end having a curved portion extending from one of said side walls across more than one-half of the maximum width of said implant in a plane dividing said implant into an upper half and a lower half, the curved portion having a constant radius of curvature, said interior and exterior side walls being between said opposed portions and said leading and trailing ends, said interior side wall adapted to be oriented toward another implant when inserted within the disc space, each of said opposed portions having a vertebral body contacting surface between said at least one opening and at least one of said interior side wall and said exterior side wall, each of said vertebral body contacting surfaces being adapted to be placed toward one of the adjacent vertebral bodies, said opposed portions being spaced apart to define a hollow interior in communication with said openings; andsaid implant being adapted to be wholly contained within the disc space when implanted. 18. The implant of claim 17, wherein said trailing end has a radius of curvature, the radius of curvature of said leading end being different from the radius of curvature of said trailing end. 19. The implant of claim 18, wherein the radius of curvature of said leading end is greater than the radius of curvature of said trailing end. 20. The implant of claim 17, in combination with a fusion promoting substance. 21. The implant of claim 20, wherein said fusion promoting substance is at least one of bone, morphogenetic protein, and genes coding for the production of bone. 22. The implant of claim 17, further comprising a plurality of non-threaded surface projections that cover said opposed portions along a majority of the length of said implant. 23. The implant of claim 17, wherein the maximum height of said implant is greater than the maximum width of said implant along the entire length of said implant. 24. The implant of claim 17, further comprising at least one protrusion extending from at least one of said opposed portions for engaging at least one of the adjacent vertebral bodies to maintain said implant within the disc space. 25. The implant of claim 17, 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 part of said opposed portions. 26. The implant of claim 17, wherein at least a portion of said opposed portions are generally in a converging relationship to each other from trailing end to leading end for allowing angulation of the adjacent vertebral bodies relative to each other. 27. The implant of claim 17, wherein said implant is adapted for insertion from the posterior aspect of the vertebral bodies and said leading end is configured to conform to the anatomic contour of at least a portion of the anterior aspect of the vertebral bodies. 28. The implant of claim 17, wherein said implant is adapted for insertion from the anterior aspect of the vertebral bodies and said leading end is configured to conform to the anatomic contour of at least a portion of the posterior aspect of the vertebral bodies. 29. The implant of claim 17, wherein said trailing end is generally symmetrical relative to the mid-longitudinal axis.
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