Back to results
US 5,888,227 AGranted
Inter-vertebral implant
AssigneeSynthes USA, LLC
InventorWilliam Cottle
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSynthes USA, LLC
InventorWilliam Cottle
Estimating the term…
An inter-vertebral implant having of a frame-like cage (1) enclosing a space (20), with a top and bottom surface (11,12), two side surfaces (13, 14), a front (16) and a rear wall (15). The top and bottom surfaces (11, 12) have a plurality of perforations (24), the total area of which amounts to 40 to 55% of the total area of said surfaces (11, 12). The individual area of a single perforation (24) is at most 20% of the total area of the top and bottom surfaces (11, 12). The ratio VH/VK between the volume VH of the space (20) and the total volume VK of the cage (1) is in the range from 70 to 90%. The cage (1) is substantially wedge-shaped with top and bottom surfaces (11, 12) diverging towards the front wall (16). This gives the advantage that, owing to the large bone bearing area of the top and bottom surfaces, the implant is prevented from sinking into the end plates of the body of the vertebra.
An intervertebral implant comprising a frame-like cage which is essentially wedge-shaped, encloses a cavity, and which has perforated cover and base faces as bone-contacting surfaces, two lateral surfaces, and front and rear walls, wherein the cover and base faces diverge toward the front wall, and at least one of the cover face or base face has a plurality of perforations whose total area makes up 40 to 50% of the total area of the cover face or base face;
Dependencies are inferred from the claim text.