LANZHOU SEEMINE SMA CO., LTD;SUZHOU SEEMINE-NEBULA BIOTECHNOLOGY CO., LTD
发明人:
Chenguang ZENG
申请号：
US16462486
公开号：
US20190365443A1
申请日:
2017.12.14
申请国别(地区):
US
年份:
2019
代理人:
摘要：
A high-strength absorbable internal fixation bone screw for a fracture. The bone screw is made of a degradable oriented polylactic acid section. A raw material for the oriented polylactic acid section is a poly(L-lactic acid). The specific optical rotation of the poly(L-lactic acid) is −；155° to −；160°. The section is made of the poly(L-lactic acid) through the processes of making a billet, orientation strengthening and quenching in order. The method for making the billet is plastic injection molding. The method for orientation strengthening is forging and pressing or extrusion. The section is turned, finely milled, or directly molded into the bone screw. The bone screw has high strength and a low rate of mechanical strength loss, ensures mechanical support during bone healing and sufficient healing time for an injured bone, has good biocompatibility, and can be degraded and absorbed.
