Bone screw with axially two-part screw head

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/84 (2006.01) A61B 17/70 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2376030

The invention relates to a bone screw (14; 28) that is provided with a screw shaft (1) that is to be anchored in the bone in a direction coaxial with respect to the longitudinal axis (3) of the screw and with a screw head (2). Said bone screw (14; 28) is configured as an axially composite element. At least the screw head (2) is axially two-part and comprises a screw shaft lower part (4) and a terminal upper part (5) that is linked with the lower part (4) and/or the screw head (1). The invention also relates to a device for the osteosynthetic bone fixation with at least one such bone screw (14; 28). Said device comprises A) at least one plate-shaped, prismatic or cylindrical fixation element (41) that is provided with at least one bore (37) with a center axis (30) for receiving the bone screw (14; 28) and a screw shaft lower part (36) and a screw head upper part (33). The invention is also characterized in that B) the bore (37) comprises a concave section (39) that tapers in the direction of the lower part (36); and C) the diameter of the lower part (4) is chosen such that the lower part (4) can be accommodated in the concave section (39) of the bore (37) at different angles between the longitudinal axis (3) of the screw and the center axis (30) and is placed on the wall (40) of the bore (37).

La présente invention concerne une vis à os (14; 28) comportant une tige de vis (1) destinée à être ancrée dans un os de manière concentrique avec un axe de vis longitudinal (3), et une tête de vis (2). L'invention se caractérise en ce que la vis à os (14; 28) est constituée axialement de plusieurs parties, au moins la tête de vis (2) étant en direction axiale constituée de deux parties et comprenant une partie inférieure (4) côté tige de vis et une partie extrême supérieure (5) pouvant être reliée à la partie inférieure (4) et/ou à la tige de vis (1). Cette invention concerne également un dispositif de fixation pour os en os de synthèse comprenant au moins une vis à os (14, 28) de ce type, ledit dispositif comprenant a) au moins un corps de fixation (41) plat, prismatique ou cylindrique supplémentaire présentant au moins un alésage (37) ayant un axe central (30), destiné à recevoir la vis à os (14, 28), une face inférieure (36) côté tige de vis et une face supérieure (33) côté tête de vis. Selon l'invention: B) l'alésage (37) comprend une section concave (39) s'effilant au niveau de la face inférieure (36); et C) le diamètre d de la partie inférieure (4) est tel que ladite partie inférieure (4) peut être mise en appui contre la paroi (40) de l'alésage (37) dans la section concave (39) de l'alésage (37) entre l'axe longitudinal de la vis (3) et l'axe central (30), selon des angles différents.

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