Hemi-interbody spinal fusion implants manufactured from a major long bone ring

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

• a leading end for insertion first into the disc space, a trailing end opposite said leading end, said implant having a length along a mid-longitudinal axis of said implant from said leading end to said trailing end, said length of said implant being greater than one half the depth of the vertebral bodies adjacent the disc space into which said implant is adapted to be inserted;
• 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 opposed upper and lower portions having a maximum height therebetween, said upper and lower portions being non-arcuate along at least a portion of the length of said implant;
• an interior side, an exterior side opposite said interior side, and a maximum width therebetween greater than said maximum height, said maximum width of said implant being less than approximately one-half of the width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said interior and exterior sides connecting said upper and lower portions and said leading and trailing ends, said interior side and said exterior side each being at least in part straight along at least a portion of the length of said implant, said leading end being asymmetrical from side to side, said leading end and said trailing end each being at least in part curved from side to side, said interior side adapted to be oriented toward an interior side of another implant when inserted within the disc space;
• and
• said implant being manufactured from a bone composite material, said interior side of said implant including a recess, said interior side of said implant including a recess so that when said implant is placed side by side another implant having an interior side including a recess a passage is formed adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through said passage;
• and
• the combined width of said pair of said implants being greater than one halt the width of the adjacent vertebral bodies into which said implants are adapted to be inserted.

A pair of interbody spinal implants made of cortical bane for insertion at least in part into the same 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, each of said implants comprising:

• a leading end for insertion first into the disc space, a trailing end opposite said leading end, and 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 defining a height of each of said implants, said upper and lower portions being non-arcuate along at least a portion of the length of each of said implants;
• and
• opposite sides between said upper portion and said lower portion, and between said leading and trailing ends, said opposite sides defining a width of each of said implants, said leading end being configured in the shape of a portion of a circle from one of said opposite sides to another one of said opposite sides, the circle having a radius greater than the width of each of said implants;
• each of said implants being manufactured from a bone ring obtained from a major long bone of a human being having a medullary canal, one of said opposite sides of each of said implants including at least a portion of the medullary canal so that when said pair of implants are placed side-by-side in the same disc space a passage is formed adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through each of said implants;
• said leading ends of said implants forming part of the same circle when inserted into the same implantation space.

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 upper and lower portions defining a height of said implant, said upper and lower portions being non-arcuate along at least a portion of the length of said implant;
• and
• 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, each of said sides being at least in part straight along at least a portion of the length of said implant, said leading end being configured in the shape of a portion of a circle from one of said opposite sides to another one of said opposite sides, the circle having a radius greater than the width of said implant, the width of said implant being less than one-half the width of the adjacent vertebral bodies into which said implant is adapted to be inserted;
• said implant being manufactured from a bone ring obtained from a major long bone of a human being having a medullary canal, one of said opposite sides of each of said implants including at least a portion of the medullary canal so that when said pair of implants are placed side-by-side in the same disc space a passage is formed adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through said implant.