Multidirectional adaptable vertebral osteosynthesis device with reduced space requirement

摘要

The device comprises at least two bone anchorage screws (1; 31) for screwing into the respective vertebral bodies (S, L5...). A longitudinal connection member (2; 16) is provided interconnecting the screws, having connecting stirrups (3) interconnecting the screws and the connection members between the screws. Each screw comprises a bone anchorage threaded shank (4; 32), a tool engagement head (5; 33) for engagement by a screwing tool (6), a threaded stem (7) extending the engagement head. A nut (8) is screwable on said stem for locking together the connecting stirrup, with the longitudinal connection member and the corresponding screw. The threaded stem (7) is provided with a terminal joint ball (11) for articulation in a socket (12) in the engagement head (5) permitting a pluridirectional orientation of the stem (7) and a positioning of the connecting stirrup (3) adapted to the configuration of the vertebral segment (S, L5...L2) receiving the screws.