A cannulated bone screw assembly for fixation of collapsed or comminuted fractures of non-spinal load-bearing bones

Abstract

The application discloses a hollow perfusion screw assembly for fixing collapsed or crushed fracture of non-spinal load-bearing bone, which comprises a screw body, characterized in that a perfusion channel is arranged in the screw body; the screw body is provided with a plurality of bone cement release openings which are asymmetrically distributed on the stem along the axial direction and / or the circumferential direction of the screw body; at least part of the bone cement release openings are oblique holes, long circular holes or strip-shaped holes, and have different opening directions or hole diameters; the bone cement enters the fracture lines between large bone blocks, the fracture lines between the large bone blocks and small bone blocks which are not directly fixed by the screw, the fracture lines between small bone blocks, the gaps between crushed bone and / or the collapsed cavities through the release openings, forms a directional extension filling and bonding structure, and forms a composite load-bearing structure together with the screw body and the main bone frame.

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