Patent ID: 8590247

Claim:
An anchoring device, comprising: a shaft; a head attached with an end of the shaft; and a rail system formed on an interior surface of the shaft and disposed within the shaft, the rail system comprising: a rod insertion rail running parallel to a longitudinal axis of the shaft, configured such that a rod may be inserted into the shaft; a pin insertion rail running parallel to and disposed about the longitudinal axis of the shaft and alongside the rod insertion rail, configured such that a rod having a protruding pin may be inserted into the shaft; a turning space within the shaft, configured such that a rod having a pin that has been inserted into the shaft via the rod and pin insertion rails will be able to rotate freely along the longitudinal axis of the shaft when a portion of the rod having the pin reaches the turning space; and a locking rail comprising a surface having a pin retention guide disposed on a portion thereof, extending perpendicular to the longitudinal axis of the shaft and alongside the rod insertion rail, configured such that when a portion of a rod having a pin reaches the turning space, the rod can be turned along the longitudinal axis of the shaft and the pin then coupled with the pin retention guide of the locking rail, whereby the rod and pin are retained in the shaft by the locking rail, with the pin retention guide preventing the rod and pin from rotating in a plane perpendicular to the shaft.