Device for connecting a longitudinal carrier to a bone

Details Device for connecting a longitudinal carrier to a bone Device for connecting a longitudinal carrier to a bone

A - Human Necessities

61

B

A61B 17/70 (2006.01)

Patent

CA 2539831

A device for connecting a longitudinal carrier (3) to a bone, particularly a vertebral body, comprising A) a bone anchoring element (1) which can be fixed to a bone; B) a connecting element (9) which is arranged on the rear end (5) of the bone anchoring element (1) with a channel (25) which penetrates the connecting element (9) perpendicular to the center axis (2) and which is used to receive a longitudinal carrier (3); tensioning means (13) which can be connected to the free end (21) of the connecting element (9) and which are suitable for fixing a longitudinal carrier (3) introduced into the channel (25); and D) a tilting element (8) which is arranged in the channel (25) and which can be rotated about an axis of rotation (7) perpendicular to the center axis (2) and channel axis (27), whereby E) the tilting element (8) has a lower surface which is curved concentrically in relation to the axis of rotation (7) and which forms a first contact surface (K1); F) the base of the channel (26) is embodied in such a way that it is complementary to the lower surface (28) of the tilting element (8), such that it forms a second contact surface (K2) which can be brought to bear on the first contact surface (K1); and G) at least one of the two contact surfaces (K1;K2) has three-dimensional macroscopic structuring (16).

La présente invention concerne un dispositif pour relier un support longitudinal (3) à un os, en particulier à un corps vertébral, le dispositif comprenant: A) un élément d'ancrage d'os (1) qui peut être fixé à un os; B) un élément de liaison (9) mis en place à l'extrémité arrière (5) de l'élément d'ancrage d'os (1) et comprenant un canal (25) qui traverse l'élément de liaison (9) transversalement à l'axe central (2) et sert à recevoir un support longitudinal (3); C) un système de serrage (13) qui peut être relié à l'extrémité libre (21) de l'élément de liaison (9) et convient à la fixation d'un support longitudinal (3) introduit dans le canal (25); et D) un élément de basculement (8) disposé dans le canal (25), qui peut tourner autour d'un axe de rotation (7) qui est à la fois transversal à l'axe central (2) et à l'axe du canal (27). Selon l'invention: E) l'élément de basculement (8) présente une surface inférieure (28) incurvée de façon concentrique avec l'axe de rotation (7), ladite surface formant une première surface de contact (K1); F) le fond de canal (26) est complémentaire de la surface inférieure (28) de l'élément de basculement (8) de sorte que celui-ci forme une seconde surface de contact (K2) qui peut être mise en contact avec la première surface de contact (K1); et G) au moins l'une des deux surfaces de contact (K1;K2) présente une structure macroscopique tridimensionnelle (16).

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