Methods 1. Design titanium alloy expansile interbody fusion cage(EFC) according to the problems mentioned above and the special requirement of endoscopic surgery.

• 方法:1、针对上述前两个问题,并结合内窥镜下手术的工作环境要求,设计新型的钛合金膨胀式腰椎间融合器(EFC)。