Inter-vertebral implant

Details Inter-vertebral implant Inter-vertebral implant

A - Human Necessities

61

F

A61F 2/44 (2006.01) A61F 2/00 (2006.01) A61F 2/28 (2006.01) A61F 2/30 (2006.01) A61F 2/46 (2006.01)

Patent

CA 2229822

The inter-vertebral implant consists of a frame-like cage enclosing a space, with a top and bottom surface, two side surfaces, a front and a rear wall. The top and bottom surfaces have a plurality of perforations, the total area of which amounts to 40 to 55 % of the total area of said surfaces. The individual area of a single perforation is at most 20 % of the total area of the top and bottom surfaces. The ratio VH/VK between the volume VH of the space and the total volume VK of the cage is in the range from 70 to 90 %. The cage is substantially wedge-shaped with top and bottom surfaces diverging towards the front wall. 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.

L'invention concerne un implant intervertébral constitué d'une cage (1) en forme de cadre renfermant une cavité (20) entre un couvercle et une base (11,12), deux faces (13,14) latérales, une paroi (16) frontale et un fond (15) arrière. Le couvercle et la base (11,12) sont dotés d'une pluralité de perforations (24) dont la surface totale représente 40 à 55 % de la surface totale du couvercle et de la base (11,12). La surface d'une seule perforation (24) représente 20 % maximum de la surface totale du couvercle et de la base (11,12). Le rapport VH/VK entre le volume VH de la cavité (20) et le volume total VK de la cage (1) se situe entre 70 et 90 %. La cage (1) est de conception sensiblement cunéiforme avec un couvercle et une base (11,12) divergents en direction de la paroi (16) frontale, ce qui permet d'éviter que l'implant ne s'affaisse sur la plaque terminale du corps vertébral grâce à la grande surface d'appui osseux du couvercle et de la base.

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