The invention relates to an osteosynthesis device comprising, on the one hand, a plate (12), which can be adjusted along a bone element (10), and at least one pin (26), and, on the other hand, a locking bushing (30) for rigidly connecting said plate (12) and said at least one pin (26). Said locking bushing (30) has a screwable part (32) and a drive part (34) separated from each other by a breakable zone (38), said screwable part having axial slits (44) that form notches (50). Said breakable zone (38) is intended to be broken in order to free said screwable zone (32) from said drive part (34). Said axial slits (44) extend into said breakable zone (38) so as to be able to fragment said screwable part (32) into independent notches (50) when said breakable zone (38) is broken, in order to be able to adjust the relative position of said notches (50) around said at least one pin (26).La invención se relaciona con un dispositivo de osteosíntesis que comprende, por un lado, una placa (12), la cual puede ser ajustada a lo largo de un elemento óseo (10), y al menos un perno (26), y, por otro lado, un buje de bloqueo (30) para conectar rígidamente la placa (12) y al menos un perno (26). El buje de bloqueo (30) tiene una parte roscable (32) y una parte accionable (34) separadas entre si por una zona frágil o rompible (38), teniendo la parte roscable ranuras axiales (44) que forman hendiduras (50). Se pretende que la zona frágil rompible (38) sea rota para liberar la zona roscable (32) de la parte accionable (34). Las ranuras axiales (44) se extienden hacia la zona rompible (38) para poder fragmentar la parte roscable (32) hacia hendiduras independientes (50) cuando la zona rompible (38) se rompa para poder ajustar la posición relativa de las hendiduras (50) alrededor de al menos un perno (26).
