| 摘要 |
An anchor screw assembly includes a screw having a threaded portion and a head portion to which a swing bolt is pivotally coupled. A clamp assembly includes lower and upper clamp portions assembled into connecting beams that are securable on the swing bolt by a fastener. The clamp portions include first passages for receiving an intermediate region of the swing bolt therethrough to receivably retain the clamp assembly on the connecting beam and on the swing bolt. The head portion of the screw includes a shoulder, and the lower clamp portion has a seat that frictionally engages the shoulder when the clamp assembly is fully secured on the connecting beam and swing bolt, thereby securing the swing bolt relative to the screw. Multiple screw assemblies are screwed into adjacent vertebrae, and a connecting member is secured by the clamp assemblies between the anchor screw assemblies to stabilize the vertebrae.
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