Intervertebral implant comprising a three-part articulation

Details Intervertebral implant comprising a three-part articulation Intervertebral implant comprising a three-part articulation

A - Human Necessities

61

F

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

Patent

CA 2497278

An intervertebral implant having a central axis (1) substantially parallel to or coaxial with the spinal column's longitudinal axis and comprising: (A) an upper and a lower terminal part (2; 3) each having an outermost surface (5; 6) configured transversely to the central axis (1) each to come to rest against the end surfaces of two adjacent vertebras and each being opposite a concave inner surface (7;8); and (B) a convex joint element (4) situated between the terminal parts (2; 3) and resting in sliding manner against the concave inner surfaces (7; 8) of the two terminal parts (2; 3), where (C) the first concave surface (7) is a partial surface of a first rotationally symmetrical external surface (11) about the axis of rotation (12) transverse to the central axis (1); and (D) the second concave inner surface (8) of a second rotationally symmetrical conical external surface (16) about the axis of rotation (14) transverse to the central axis (1).

L'invention concerne un implant intervertébral présentant un axe central (1) sensiblement parallèle ou coaxial à l'axe longitudinal de la colonne vertébrale. Cet implant intervertébral comprend A) des embouts supérieur et inférieur (2 ; 3), présentant chacun une surface extérieure (5 ; 6) transversale à l'axe central (1), prévue pour reposer contre une des deux surfaces d'extrémité de deux corps vertébraux adjacents, ainsi qu'une surface intérieure concave opposée (7 ; 8), et B) un corps articulaire convexe (4) positionné entre les deux embouts (2 ; 3) et reposant de façon coulissante contre les surfaces intérieures concaves (7 ; 8) des deux embouts (2 ; 3), C) la première surface intérieure concave (7) étant une surface partielle d'une surface d'enveloppe (11) à symétrie de rotation par rapport à un premier axe de rotation (12) transversal à l'axe central (1) et D) la seconde surface intérieure concave (8) étant une surface partielle d'une surface d'enveloppe conique (16) à symétrie de rotation par rapport à un second axe de rotation (14) transversal à l'axe central (1).

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