A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/70 (2006.01)
Patent
CA 2267753
A multi-axial bone screw assembly (10) includes a bone screw (11) having a partially spherical head (22). The bone screw head (22) is truncated at an upper surface (24) in which a tool receiving recess (25) is defined. The assembly includes a receiver member (12) including a central bore (34) that defines a tapered recess (35) to receive the head (22) of the bone screw (11). The bore (34) of the receiver member also defines a channel (33) communicating with the recess (35) and configured to receive a spinal rod (R) therein. A portion (37) of the channel is threaded to receive a set screw (14) above the rod. The assembly (10) also includes a crown member (13) disposed between the rod (R) and the head (22) of the bone screw (11). As the set screw (14) is tightened into the receiver member (12), the set screw (14) compresses the rod (R) against the crown member (13), which presses the head (22) of the bone screw (11) into the tapered recess (35). In one embodiment, the head (22) of the bone screw (11) includes a flared edge (26) that penetrates at least the crown member (13) as the assembly (10) is tightened.
Un ensemble vis osseuse multi-axial (10) comprend une vis osseuse (11) ayant une tête (22) partiellement sphérique. La tête (22) est tronquée au niveau de sa surface supérieure (24), dans laquelle est défini un évidement (25) destiné à recevoir un outil. L'ensemble comprend un élément receveur (12) comportant un alésage central (34), qui définit un évidement conique (35) destiné à recevoir la tête (22) de la vis (11). L'alésage (34) de l'élément receveur définit également un canal (33) communiquant avec l'évidement et configuré de façon à recevoir une tige spinale (R). Une partie (37) du canal est taraudée afin de recevoir une vis d'arrêt (14) au-dessus de la tige. L'ensemble (10) comprend également un élément couronne (13) disposé entre la tige (R) et la tête (22) de la vis (11). Quand la vis d'arrêt (14) est enfoncée dans l'élément receveur (12), elle comprime la tige (R) contre l'élément couronne (13), qui pousse la tête (22) de la vis (11) dans l'évidement conique (35). Dans l'un des modes de réalisation, la tête (22) de la vis (11) comporte un rebord biseauté (26) qui pénètre dans au moins l'élément couronne (13) quand on resserre l'ensemble (10).
Drewry Troy
Sherman Michael C.
Sdgi Holdings Inc.
Smart & Biggar
Warsaw Orthopedic Inc.
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