| 摘要 |
A vertebral locking and retrieivng system comprises two fixing screws, one fixation crossbar and a plurality of fasteners. Each of the two fixing screws is composed of a horizontal fixing portion and a threaded portion which is fastened onto a vertebra. The fixation crossbar is composed of a bar portion and at least one longitudinal fixing portion located at the midpoint of the bar portion. The horizontal fixing portions of the two fixing screws are fastened respectively with both ends of the bar portion of the fixaton crossbar by means of a plurality of fasteners. The threaded portion and the horizontal fixing portion of the fixing screw form an angle ranging between 3 degrees and 30 degrees. The two fixing screws are fastened onto the same vertebra such that they are opposite to each other.
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