| 摘要 |
A bone screw for connecting fractured bone segments or holding a bone plate to a bone has a hollow channel for the delivery of bone cement. It furthermore has a threaded proximal section with a means for attaching a driving tool. Next to the proximal section is a threaded center section with a cylindrical shape having a smaller diameter than the proximal section, and a second thread with a different pitch. At the end of the screw, there is an unthreaded distal section with a plurality of side opening. The side openings have a conical shape forming a cutting edge with an edge angle of less than 90 degrees for simplified removal of the screw. For a controlled injection of bone cement, resulting in a better stability, there are pairs of two side openings at opposite sides of the channel, which have a larger cross-section than the channel in a distal direction. For further improving the stability, a distal opening is provided at the end of the distal section and at least two side openings are provided in close proximity to the distal opening. |
