Intervertebral implant with joint parts mounted on roller...

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/44 (2006.01) A61B 17/86 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01) A61F 2/46 (2006.01)

Patent

CA 2510242

An intervertebral implant (1), especially an artificial intervertebral disc, comprising a central axis (2), an upper part (10) which can be arranged on the base plate of a vertebral body located thereabove, and a lower part (20) which can be arranged on the cover plate of a vertebral body located therebelow. A) The upper part (10) comprises a ventral side surface (11), a dorsal side surface (12), two lateral side surfaces (13,14), an upper apposition surface (15) and a lower surface (16).B) The lower part (20) comprises a ventral side surface (21), a dorsal side surface (22), two lateral side surfaces (23, 24), a lower apposition surface (25) and an upper surface (26). C) The two parts (10, 20) can be moved in relation to each other by means of two joints (38; 39) disposed between the two parts (10; 20). D) Each of the joints has an axis of rotation (3; 4) and the two axes of rotation (3; 4) are arranged crosswise in relation to each other. E) Each of the joints (38; 39) has at least one axis (34; 36) which is coaxial in relation to the respective axis of rotation (3; 4) and a bearing shell (35; 37) receiving the axis (34; 36). F) Roller bodies (70) are inserted between the axes (34; 36) and the bearing shells (35; 37).

L'invention concerne un implant intervertébral (1), en particulier un disque intervertébral artificiel, présentant un axe central (2), une partie supérieure (10) destinée à être placée contre la plaque de base d'un corps vertébral situé au-dessus, ainsi qu'une partie inférieure (20) destinée à être placée contre la plaque supérieure d'un corps vertébral situé au-dessous. La partie supérieure (10) présente un bord ventral (11), un bord dorsal (12), deux bords latéraux (13, 14), une face d'apposition supérieure (15) et une surface inférieure (16) et la partie inférieure (20) présente un bord ventral (21), un bord dorsal (22), deux bords latéraux (23, 24), une face d'apposition inférieure (25) et une surface supérieure (26). Les parties supérieure et inférieure (10, 20) peuvent être déplacées l'une par rapport à l'autre au moyen de deux articulations (38 ; 39) disposées entre lesdites parties. Chacune de ces articulations (38 ; 39) présente un axe de rotation (3 ; 4), les deux axes de rotation (3 ; 4) étant perpendiculaires l'un par rapport à l'autre. Chacune des articulations (38 ; 39) comprend au moins un axe (34 ; 36) coaxial par rapport à son axe de rotation respectif (3 ; 4), ainsi qu'une coquille de palier (35 ; 37) destinée à recevoir l'axe (34 ; 36). L'invention se caractérise en ce que des organes de roulement (70) sont insérés entre les axes (34 ; 36) et les coquilles de palier (35 ; 37).

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