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 maximum alignment correction pin comprising:
an elongated shaft having an overall length from an inner leading tip end to an outer or distal end of at least 100 mm, the elongated shaft having a pedicle screw thread portion, a second thread portion and a transition portion; the pedicle screw thread portion having or adjacent the inner leading tip end of the shaft and having pedicle screw threads extending along the shaft a distance of at least 40 mm for fastening the shaft into vertebral bone; the second thread portion disposed toward the outer or distal end of said elongated shaft, said second thread portion having a second thread configured to engage a cannulated tower having complimentary threads which when rotated allow for moving a vertebrae along a sagittal plane to alignment; the transition portion on said elongated shaft spaced between the pedicle screw thread portion and the second thread portion, wherein the transition portion has a smooth uniform or constant outer diameter extending in length along the transition portion from 1 to 3 cm, the outer diameter of the transition portion being at least equal to a maximum diameter of said second thread,the transition portion configured to receive an untightened rod coupler loosely connected and movable to slide freely within the transition portion, the loosely connected rod coupler having a rod affixed for connection to a tulip of an embedded pedicle screw; and
wherein the elongated shaft has the pedicle screw thread portion configured to be embedded in the vertebrae and once the pedicle screw thread is embedded, the elongated shaft with the pedicle screw portion does not rotate, but moves longitudinally as the second threads are moved by rotation of the cannulated tower abutted against the untightened rod coupler with the rod affixed loosely sliding along the length of the smooth transition moving the vertebrae to alignment where the coupler is then tightened against the transition portion of the maximum alignment correction pin and the transition portion of the elongated shaft cut flush to the coupler removing the second thread portion.