Contoured spinal fusion implants made of bone or a bone composite material

An interbody spinal implant made of cortical bone for insertion at least in part into an implantation space formed across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect and a depth therebetween, said implant comprising:

• a leading end for insertion first into the disc space and a trailing end opposite said leading end, said implant having a length from said leading end to said trailing end;
• opposed upper and lower portions between said leading and trailing ends adapted to be placed at least in part within and across the height of the disc space to contact and support the adjacent vertebral bodies;
• said implant having a maximum width that is greater than one-half of the width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said leading end configured in the shape of approximately one half of a first circle along the width of said implant, said trailing end having a radius of curvature of a second circle along the width of said implant, the second circle having a radius greater than the radius of the first circle;
• and
• said implant being manufactured from a bone ring obtained from a major long bone of a human having a medullary canal, said implant including at least a portion of the medullary canal passing through said upper and lower portions to form a passage adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through said passage.

An interbody spinal implant made of a bone composite material for insertion at least in part into an implantation space formed across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect and a depth therebetween, said implant comprising:

• a leading end for insertion first into the disc space and a trailing end opposite said leading end, said implant having a length from said leading end to said trailing end;
• opposed upper and lower portions between said leading and trailing ends adapted to be placed at least in part within and across the height of the disc space to contact and support the adjacent vertebral bodies, said upper and lower portions being non-arcuate along at least a portion of the length of said implant;
• opposite sides between said upper portion and said lower portion, and between said leading and trailing ends, said opposite sides defining a width of said implant, at least one of said opposite sides being at least in part straight along at least a portion of the length of said implant, said leading end configured in the shape of approximately one half a circle from one of said opposite sides to another of said opposite sides, the circle having a diameter generally equal to the width of said implant;
• and
• said implant being manufactured from a bone composite material, said upper and lower portions of said implant including at least one opening in communication with one another to form at least a portion of a passage adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through said passage.

An interbody spinal implant made of a bone composite material for insertion at least in part into an implantation space formed across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect and a depth therebetween, said implant comprising:

• a leading end for insertion first into the disc space and a trailing end opposite said leading end, said implant having a length from said leading end to said trailing end;
• opposed upper and lower portions between said leading and trailing ends adapted to be placed at least in part within and across the height of the disc space to contact and support the adjacent vertebral bodies;
• said implant having a maximum width that is greater than one-half of the width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said leading end configured in the shape of approximately one half of a first circle along the width of said implant, said trailing end having a radius of curvature of a second circle along the width of said implant, the second circle having a radius greater than the radius of the first circle;
• and
• said implant being manufactured from a bone composite material, said upper and lower portions of said implant including at least one opening in communication with one another to form a passage adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through said passage.