Angle-adjustable bone screw and device for the...

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/68 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2669794

A bone screw (2; 14) with a screw shank (4; 21) to be anchored concentric to a longitudinal axis (5; 24) of the screw in a bone or bone part, and with a screw head (3; 22), characterized in that the bone screw (2; 14) has, between the screw head (3; 22) and the screw shank (4; 21), a disk-shaped collar (6; 23) which is concentric to the longitudinal axis (5; 24) of the screw and whose diameter is greater than the diameter of the screw shank (4; 21). A device for osteosynthetic bone fixation with A) at least one such bone screw (2; 14); and B) at least one plate-shaped, prismatic or cylindrical fixation body (1; 15) which has at least one bore (7; 17) with a central axis (8; 16) for receiving the bone screw (2; 14), an underside (9; 19) toward the screw shank, and an upper side (11; 18) toward the screw head, C) the bore (7; 17) comprising a portion (10; 26) tapering toward the underside (9; 19), and D) the diameter d of the collar (6; 23) being dimensioned such that the collar (6; 23), in the concave portion (10; 26) of the bore (7; 17), can be made to bear on the wall (12; 27) of the bore (7; 17) at different angles between the longitudinal axis (5; 24) of the screw and the central axis (8; 16).

Vis à os (2; 14) dotée d'une tige de vis (4; 21)devant être ancrée de manière concentrique à un axe longitudinal (5; 24) de la vis dans un os ou une partie d'os, munie d'une tête de vis (3; 22), caractérisée par le fait que la vis à os 2; 14) a, entre la tête de vis (3; 22) et la tige de vis (4; 21), un collet en forme de disque (6; 23) qui est concentrique par rapport à l'axe longitudinal (5; 24) de la vis et dont le diamètre est supérieur à celui de l'arbre de vis (4; 21). Un dispositif pour la fixation pour os en os de synthèse possédant A) au moins une vis à os (2; 14); et B) au moins un corps de fixation (1, 15) en forme de plaque, de prisme ou cylindrique possédant au moins un trou (7; 17) doté d'un axe central (8; 16) pour recevoir la vis à os (2; 14), un côté inférieur (9; 19) vers la tige de vis, et un côté supérieur (11; 18) vers la tête de vis, C) le trou (7; 17) comprenant une partie (10; 26) conique vers le côté inférieur (9; 19), et D)6 le diamètre du collet (6; 23) dimensionné pour qu'il (6; 23) puisse, dans la partie concave (10; 26) du trou (7; 17),être fabriqué afin de s'appuyer sur la paroi (12; 27) du trou (7; 17) à des angles différents entre l'axe longitudinal (5; 24) de la vis et l'axe central (8; 16).

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