Patent ID: 9060811
Filing Date: 2015-06-23
Classification: A61B

Abstract:
1. A pedicle-screw assembly comprising: a screw having a threaded shaft extending along a screw axis and having at an axially outer end of the shaft a ball head having a substantially spherical outer surface from which the threaded shaft extends and an equator lying in a plane perpendicular to the screw axis; a tulip body extending along a body axis and formed with an inwardly open screw-head seat in which the ball head can fit, with two pin seats open radially inwardly of the body axis into the screw-head seat, and with an oppositely outwardly open rod seat adapted for holding a spine-stabilizing rod; a retainer fitted in the screw-head seat and engaging around the spherical outer surface of the ball head mostly between the equator and the shaft; and respective pins extending radially of the body axis and seated in the pin seats of the body and in the retainer for pivoting of the retainer in the screw-head seat about a retainer axis substantially perpendicular to the body axis between a position with the body axis coaxial with the screw axis and a position with the body axis forming an acute outwardly open angle with the screw axis, the ball head being swivelable in and relative to the retainer.