[미국특허]
Arcuate interbody spinal fusion implant having a reduced width and 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-0133528
(2005-05-20)
등록번호
US-9078768
(2015-07-14)
발명자
/ 주소
Michelson, Gary K.
출원인 / 주소
WARSAW ORTHOPEDIC, INC.
대리인 / 주소
Martin & Ferraro, LLP
인용정보
피인용 횟수 :
0인용 특허 :
149
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 spinal fusion implant for insertion into an implantation space formed into two adjacent vertebral bodies of a human spine, said implant comprising: a leading end for insertion into the implantation space, a trailing end opposite said leading end, a central longitudinal axis extending through sa
1. A spinal fusion implant for insertion into an implantation space formed into two adjacent vertebral bodies of a human spine, said implant comprising: a leading end for insertion into the implantation space, a trailing end opposite said leading end, a central longitudinal axis extending through said leading and trailing ends, a length between said trailing end and said leading end along the central longitudinal axis, said leading end being configured to facilitate insertion between the two adjacent vertebral bodies, and said trailing end being sized and configured to fit into the implantation space between the two adjacent vertebral bodies;opposed upper and lower arcuate surfaces connecting said leading and trailing ends, said upper and lower arcuate surfaces including 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 upper arcuate surface, when said implant is positioned in the implantation space, being oriented toward and facing an upper vertebral body of the two adjacent vertebral bodies, and said lower arcuate surface, when said implant is positioned in the implantation space, being oriented toward and facing a lower vertebral body of the two adjacent vertebral bodies; anda medial side having a medial side surface and a lateral side having a lateral side surface, said medial side being configured for placement adjacent a midline of the implantation space extending between anterior and posterior aspects of the human spine, said implant having first width and a second width from said medial side to said lateral side in a first plane, the first plane extending through the central longitudinal axis, through said medial and lateral sides, and through said leading and trailing ends, said implant having a maximum height from said upper arcuate surface to said lower arcuate surface in a second plane, the second plane bisecting the length of the implant along the central longitudinal axis, being perpendicular to the central longitudinal axis, and extending through said upper and lower arcuate surfaces and through said medial and lateral sides, the first width of said implant extending in the second plane and bisecting the maximum height of said implant, the second width of said implant extending in a third plane, the third plane being positioned directly adjacent said leading end, being perpendicular to the central longitudinal axis, and extending through said upper and lower arcuate surfaces, the medial side surface having a first length in the first plane from the third plane to the trailing end, the lateral side surface having a second length in the first plane from the third plane to the trailing end, the first length of said medial side surface being greater than the second length of said lateral side surface, said trailing end being at least in part arcuate in the first plane across more than half of the width of said implant and being arcuate in the first plane proximate an intersection of the first plane with a fourth plane through the central longitudinal axis, through said leading and trailing ends, and through said upper and lower arcuate surfaces, the fourth plane being perpendicular to the first, second, and third planes, said upper and lower arcuate surfaces being at least in part arcuate in the second plane adjacent the maximum height of the implant and adjacent the intersection of the second and fourth planes, and said implant having a maximum length along said medial side surface measured from the third plane to said trailing end. 2. The implant of claim 1, wherein said trailing end is adapted to conform from side to side to the peripheral contour of the vertebral bodies adjacent a disc space into which said implant is properly implanted. 3. The implant of claim 1, further comprising at least one protrusion extending from at least one of said upper and lower arcuate surfaces for engaging at least one of the adjacent vertebral bodies to maintain said implant within the implantation 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 extends uninterrupted along adjacent multiple turns about the central axis of said implant. 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 upper and lower arcuate surfaces. 8. The implant of claim 1, wherein each of said upper and lower arcuate surfaces 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 upper and lower arcuate surfaces 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 including 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 said implant is configured to require an element of rotation for proper insertion. 13. The implant of claim 1, wherein at least a portion of said implant is bioresorbable. 14. The implant of claim 1, in combination with an osteogenic material. 15. The implant of claim 14, wherein said osteogenic material includes at least one of bone, coral, bone morphogenetic protein, and genes coding for the production of bone. 16. The implant of claim 1, in combination with an instrument for inserting said implant at least in part into the disc space. 17. The implant of claim 1, wherein the maximum width and the maximum height are equal to one another. 18. The implant of claim 1, wherein said sides are at least in part parallel to one another. 19. The implant of claim 1, wherein at least one of said openings has a complete perimeter. 20. The implant of claim 1, wherein said trailing end is linear along a majority of a height thereof in the fourth plane. 21. The implant of claim 1, wherein said trailing end is continuously linear from said upper arcuate surface to said lower arcuate surface along the fourth plane. 22. The implant of claim 1, wherein said implant comprises a first spinal fusion implant, and further comprising a second spinal fusion implant insertable in the implantation space in a coaxially aligned relationship with said first spinal fusion implant. 23. The implant of claim 1, wherein a beveled portion is defined proximate said lateral side in the leading end. 24. The implant of claim 1, wherein said leading end includes an apex portion, and dimensions of said leading end in the first plane and perpendicular to the central longitudinal axis increase from said apex portion to the third plane. 25. The implant of claim 1, wherein said leading end includes an apex portion, a first dimension in the first plane directly adjacent the third plane and perpendicular to the central longitudinal axis, and a second dimension in the first plane directly adjacent said apex portion and perpendicular to the central longitudinal axis, the first dimension being greater than the second dimension. 26. The implant of claim 1, wherein a fifth plane, a sixth plane, a seventh plane, and an eight plane each extend parallel to the third plane and through the leading end, the fifth plane being directly adjacent the third plane, and dimensions of said leading end at the intersections of the fifth plane, the six plane, the seventh plane, and the eighth plane with the first plane decrease from the fifth plane to the sixth plane to the seventh plane to the eighth plane.
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