Osteosynthesis device (10) for fixation of bone components and bone fragments, in particular vertebrae, consisting of a shaft (13),which extends along a central axis (103), thereby defining a distal (102) and a proximal (101) direction, and the shaft (13) has at least one blade range (14) with a first (15) and a second wing (16), and proximal (101) adjacent to a neck area (12) and has a head (11) with at least one ball segment (111), and the shaft (13) has a central and continuous cannula opening (18) with a diameter (183), and at least one window (17) with an aperture width (171) is provided in the blade area (14), and the window (17) communicates with the aperture (18),and the head area (11) has an aperture (112) with an aperture diameter (113),which also communicates with the drainage opening (18), characterized by: the diameter of the aperture (183) is smaller than the aperture width of the window (171) and the diameter of the aperture (183) is also smaller than the opening diameter at the head (113) and the shaft (13) with the blade area (14),the neck area (12) and the head (11) with the ball segment (111) is completely one-piece.
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