| 摘要 |
Internal fixing device for osteosynthesis, in which the bone screws (3) are connected in a rigid and functionally stable manner with a pure titanium osteosynthesis plate (1). The walls (8) of the bore holes (2) have a narrower cross-section (5) in at least the lower of the areas which adjoin the bone contact surfaces (4), forming a stop (6) for the head (7) of the bone screw (3). The head (7) of the bone screw (3), provided with longitudinal grooves (10) and a bore (25), is connected with the osteosynthesis plate (1) with optimum rigidity and functional stability by fitting an adjusting screw (11), by means of which the spherical upper surface of the screw head (7) and the wall of the bore (8) permit a measure of axial alignment of the bone screws (3), so that precision requirements imposed on the angle of the bores for the bone screws (3) are less stringent, due to the rotatability of the screw head (7). Those surfaces of the internal fixing destined for contact with the bone (4) are preferably provided with a bio-inert, porous layer (16) to promote growth in the bone. Application of the internal fixing, besides in osteosynthesis proper, in the fixing of implants, particularly of articulatory endoprostheses, for example prostheses of the jaw, hip or vertebrae. |
