提出了一种基于非球面固定校正元件的椭球形窗口光学系统设计方法。

A design method of elliptical window optical system is proposed and it is based on the fixed aspheric corrector.

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简单的减压手术占78%，内固定校正的占20%。病例中有2%进入到硬膜。

Simple decompressive procedures comprised 78%, instrumented arthrodeses 20%, and minimally invasive intradural procedures 2% of the collected cases.

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校正定位模板的轴线、水平度和标高，用电焊固定在支架上，并焊上足够数量的支撑和拉杆。

Rectify the axis lines, levelness and elevation of the positioning form, fix it by electric welding on the bear frame and then weld sufficient supports and lifts.

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