ANGLE-ADJUSTABLE BONE SCREW AND DEVICE FOR THE OSTEOSYNTHETIC BONE FIXATION

摘要

The invention relates to a bone screw (2; 14) provided with a screw shank (4; 21) and a screw head (3; 22) which are fixed concentrically with the longitudinal axis (5; 24) Between the threaded head (3; 22) and the thread shank (4; 21), the bone screw (2; 14) is concentric with the longitudinal axis (5; 24) of the thread and whose diameter is larger than the diameter of the thread shank And a disc-shaped collar (6; 23).;The present invention also relates to a surgical instrument comprising at least one bone screw and at least one bore having a central axis for receiving bone screws, And at least one plate, prism or cylindrical fixture (1; 15) having a bottom surface (9; 19) facing the screw shank and an upper surface (11,18) facing the screw head, and C) The diameter d of the collar 6 23 is such that the collar 6 23 is tapered toward the bottom 9,19 of the bore 7,17, 27 on the bore (7; 17) at various angles between the longitudinal axis (5; 24) and the central axis (8; 16) of the screw in the recess (10; 26) The present invention provides a device for bone fixation bone fixation in a dimension that allows the bone to be fixed.