| 摘要 |
<p>The screw (1) has a screw shaft (15) including a tip (13) and arranged concentric to a longitudinal axis (27) of the screw. The shaft is anchored to a bone or part of a bone. A head (14) includes an inner connector (6) and is attached to the shaft. A sleeve (5) of the screw shaft is made of metal e.g. steel or titanium, or plastic i.e. polyether ether ketone (PEEK), which is transparent to X-rays. A core (3) forms the screw shaft, and is made of a material that is different than that of the sleeve and the leading edge of the shaft.</p> |
