The present invention relates generally to systems and methods for aligning and implanting orthopedic fixation or stabilization implants within the body. In one embodiment, the system includes at least two bone anchors, at least one of which is provided with a transverse portal and a locking member....http://www.google.fr/patents/US7083621?utm_source=gb-gplus-shareBrevet US7083621 - Articulating spinal fixation rod and system
