Objective to develop an improved adjustable bilateral aimingdevice 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。
2
The variational momentum of the zero position is that the sighting line of object space changing quantity after the fire, is the quantitative evaluation target of the optic aimingdevice.
零位走动量即瞄准线射击前后变化量，是光学瞄具稳定性定量评价指标。
3
Conclusion: Using the manual aimingdevice for the cervical pedicle for screw placement can improve the accuracy and safety during operation, and this device can be applied and popularized clinically.