DEVICE FOR THE ADJUSTABLE FIXING OF SPINAL OSTEOSYNTHESIS RODS

摘要

The present invention concerns a device for fixing osteosynthesis rods to pedicular screws (1), the device being of the type including a diapason-shaped head (4) defining two branches (4a, 4b) collectively receiving a rod (6) to be fixed, the head being locked in its housing (5) by a locking screw (7), wherein it further includes, threaded on the rod (6) and inserted between the locking screw (7) and the bottom of the housing (5), a split ring (9) whose opposing external faces (10) directed towards the locking screw (7) and said bottom are convex and received in complementary concave surfaces (11, 12) provided on the extremity of the locking screw (7) and the bottom of the receiving housing (5) of the rod (6), the ring (9), prior to locking of the screw (7), allowing for a certain angular clearance of the rod (6) with respect to the axis of the screw (1).