| 摘要 |
PURPOSE:To provide the in-vivo decomposable and absorbable plate for an internal fixing material of a fractured bone part which has the mechanical strength approximately equiv. to or slightly higher than the mechanical strength of the bone of the living body, can maintain this strength for the required time before the regeneration of the bone after the embedment into the living body and fits adequately into the operated section without requiring the excess time for decomposition, deterioration and absorption on account of an unnecessarily large size. CONSTITUTION:This plate consists of the polylactic acid having >=200,000 viscosity average mol.wt. after melt molding and stretching, 25.0X10<2> to 55.0X10<2>kg/cm<2> compressive bending strength, 15.0X10<2> to 35.0X10<2>kg/mm<2> modulus of compressive bending, and 10 to 60% crystallization degree determined from density measurement. The plate is made of the molding which has the dimensions of 10 to 18mm width, 35 to 200mm length and 1.0 to 4.5mm thickness and the shape superposed with the outside shape having an approximately semicircular shape or shape of a boiled fish paste in the cut section orthogonal with the longitudinal direction and the inside shape having a transversely broad inverted U shape. |
