A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/70 (2006.01) A61B 19/00 (2006.01)
Patent
CA 2266066
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 a contracting collet (13) carrying the head (22) of the bone screw (11). The bore (34) of the receiver member also defines a channel (33) communicating with the recess 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 contracting collet (13) disposed between the rod (R) and the head (22) of the bone screw (11). The collet (13) defines a partially spherical recess (45) to receive the head (22) of the bone screw, and includes deflectable fingers (50) that substantially surround the screw head. As the set screw (14) is tightened into the receiver member (12), the set screw (14) compresses the rod (R) against the collet (13), which presses the collet (13) into the tapered recess (35) of the receiver member (12), thereby deflecting the fingers (50) of the collet against the bone screw head.
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 un collet de rétreinte (13) portant 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 collet de rétreinte (13) disposé entre la tige (R) et la tête (22) de la vis (11). Le collet (13) définit un évidement partiellement sphérique (45) destiné à recevoir la tête (22) de la vis et comporte des doigts (50) fléchissables qui entourent sensiblement la tête de la vis. Quand la vis d'arrêt (14) est enfoncée dans l'élément receveur (12), elle comprime la tige (R) contre le collet (13), qui entre dans l'évidement conique (35) de l'élément receveur (12), ce qui fléchit les doigts (50) du collet contre la tête de la vis.
Drewry Troy
Sherman Michael C.
Sdgi Holdings Inc.
Smart & Biggar
Warsaw Orthopedic Inc.
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