OS1008 生体吸収性ポリ乳酸スクリューの力学的特性に及ぼす延伸条件の影響(OS10-2 ポリ乳酸とブレンドの力学特性,OS-10 医療用高分子系複合材料の構造と力学特性)

概要

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Usage of the conventional bioabsorbable plastic bone fixation devices have been limited, because the mechanical characteristics of them are lower. In this study, poly-L-lactide(PLA) that is one of the bioabsorbable plastic was molded into the screw shape, and the mechanical characteristics of the PLA screw was investigated. A PLA bar was prepared by extruding a rectangular PLA block, and molding into the shape of the screw by forging. The molding conditions were varied to evaluate the formability of PLA. The mechanical properties, such as pulled out strength, shearing strength and the twist strength were measured. Decrease in shear strength and increase in twist strength for the screw extruded using lubricants were observed, which is due to lower extrusion ratio. Same tendency is observed for the screws molded at higher temperature. These results suggested the lubrication and higher molding temperature have similar effects. Decrease in shear strength at molding temperature of 120 ℃ was obtained, which was caused by crystallization.
一般社団法人日本機械学会の論文
2011-07-16