| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a screw for fixing a bone, which uses bioabsorbable resin as material and which does not often cause wrenching-off troubles when fastened and has high torsional strength. <P>SOLUTION: The screw has a screw part where a screw thread is formed, and is for passing through one mass and the other mass and fastening them. The screw is formed by machining a stretched rod in such a way that the axial direction of the screw part matches with the axial direction of the stretched rod, the stretched rod being formed by subjecting a columnar rod of polylactic acid resin to torsional stretching in which the rod is twisted while being hot-stretched, wherein the torsion direction of the columnar rod is the same as the winding direction of the spiral of the screw thread. <P>COPYRIGHT: (C)2012,JPO&INPIT |
