Interbody spinal fusion implants
First Claim
1. A partially cylindrical spinal fusion implant made of a material appropriate for human implantation, said implant comprising a cylinder having a longitudinal central axis and at least a first flat side parallel to said central axis.
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Accused Products
Abstract
The present invention discloses a spinal fusion implant that is at least partially cylindrical, made of material appropriate for human implantation and having preferably, but not necessarily, one closed end and one end capable of being closed, such that an internal chamber can be filled and hold any natural or artificial osteoconductive, osteoinductive, osteogenic, or other fusion enhancing material. The partially cylindrical implant directly participates and is incorporated in the ensuing fusion. In the preferred embodiment, the implant of the present invention relies on surface roughenings of the outer surface to enhance its stability and resist dislodgement from within the disc space between two adjacent vertebrae. The implant of the present invention incorporates at its rear end, an engagement means to facilitate insertion or extraction of the implant. The implant may be filled with, coated with, and/or composed of, fusion promoting substances. Finally, the implant of the present invention does not require rotation for its insertion and can be seated by linear advancement.
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Citations
18 Claims
- 1. A partially cylindrical spinal fusion implant made of a material appropriate for human implantation, said implant comprising a cylinder having a longitudinal central axis and at least a first flat side parallel to said central axis.
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18. A hollow partially cylindrical spinal fusion implant made of a material appropriate for human implantation, comprising:
a cylinder having a longitudinal central axis and at least a first flat side parallel to said central axis, said implant having a major diameter larger than the height of the disc space between two adjacent vertebrae and a width measured from said first flat side to a diametrically opposed segment of said cylinder, said width being smaller than said major diameter.
Specification