Biodegradation absorptive bone jointing material and its production manner

摘要

PURPOSE: To provide an invivo-degradable and absorbable bone joining material which has an adequate intravital hydrolysis rate, maintains the strength approximate to the strength of the vital bone for a several months before the virtual restoration of the strength and function of a fracture part and is rapidly absorbed at the completion of the formation of the bone in the final. CONSTITUTION: This bone joining material consists of a copolymer of polylactic acid or lactic acid and glycolic acid and the average value of the ruggedness difference on the surface having the fine ruggedness is specified within a range of 0.5 to 5.0μm. The hydrolysis rate is adequately controlled by adjusting the surface roughness. The process for production comprises executing a surface roughening treatment without heating in such a manner that the average value of the ruggedness difference on the surface is kept within the range described above by melting and molding the material.