Objective to develop an improved adjustable bilateral aiming device to substitute the old single-side one to guide lateral arch screw insertion of axis.

目的针对单侧可调式枢椎椎弓螺钉定位器的不足，研制改进出一种双侧可调式侧方椎弓定位器。

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Objective to develop an improved adjustable bilateral aiming device to substitute the old single-side one to guide lateral arch screw insertion of axis.

目的针对单侧可调式枢椎椎弓螺钉定位器的不足，研制改进出一种双侧可调式侧方椎弓定位器。

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