IN-VIVO DECOMPOSITION ABSORPTIVE SCREW

摘要

PROBLEM TO BE SOLVED: To provide an in-vivo decomposition absorptive screw which allows the secure and deep screwing down of a rotating means to the last without the chipping of a hole for insertion of the rotating means and without cracking and crushing the rotating means. SOLUTION: The screw 1 consisting of an in-vivo decomposition absorptive polymer is constituted by forming an oblong or elliptic hole 1c for insertion of the rotating means on its central line 1 from the top end face of a screw head 1a toward the front end side of the screw. The hole 1c for the insertion of the rotating means is formed to an oblong or elliptic hole shape to avoid the concentration of the rotating force of the rotating means, by which the rotating force is dispersedly acted on the hole and the chipping and cracking are prevented.