Spinal alignment correction system and methods of use

摘要

A spinal alignment correction system (1) has a posted lumbar pedicle screw called a MAC Pin (10) which has an elongated shaft (11) and a rod coupler assembly (20) and a cannulated tower (40). The elongated shaft (11) has an inner pedicle screw portion (12) with pedicle threads (12A), an outer second thread portion (14) with second threads (14A) and a transition or intermediate portion (16) disposed between the pedicle screw portion (12) and the second thread portion (14). The cannulated tower (40) when mounted over said elongated shaft (11) abuts said coupler (20) along an outer cam surface and further tightening rotation of the cannulated tower (40) causes outward movement of the elongated shaft (11). The system (1) allows for a controlled alignment correction of malaligned vertebral bodies using a number of methods used to correct a variety of indications.

主权项

1. A rod coupler assembly comprising:
a rod coupler body having a first opening for receiving an elongated posted pedicle screw with a smooth shaft portion and a second opening for holding a connecting rod; a shaft holding coupling with a threaded end, the shaft holding coupling being positioned inside the first opening of the rod coupler body and extending therethrough to hold the smooth shaft portion of the elongated posted pedicle screw; a first locking nut for attachment to the threaded end of the shaft holding coupling; a washer; a second locking nut, the second locking nut threadingly engages a third opening in the rod coupler body intersecting the second opening, the second locking nut being a set screw fastener that locks the connecting rod in the second opening when tightened; and wherein the shaft holding coupling when tightened by the first locking nut is drawn into the first opening against the washer and the rod coupler body and tightens about the smooth shaft portion of the elongated posted pedicle screw fixing the pedicle screw to the rod coupler assembly.