This instrument was composed of four pedicles nails, two longitudinal connecting rods and two transverse connecting plates.
该器械由四枚椎弓根钉，两根纵向连杆和两块横向连接板组成。
A mechanical mode1 of anti-rotation mechanism with balls was established, and its operation principle is analysed, where the con-figuration of simplified parallel four-connecting rods was employed.
建立了球形防自转机构的模型，分析了其工作原理，将球形防自转机构简化为平行四连杆机构。
A mechanical mode1 of anti-rotation mechanism with balls was established, and its operation principle is analysed, where the con-figuration of simplified parallel four-connecting rods was employed.
建立了球形防自转机构的模型，分析了其工作原理，将球形防自转机构简化为平行四连杆机构。
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