Patent ID: 8864803

Claim:
A bone screw apparatus comprising: a bone screw having a threaded section, a head end and a head at the head end; a receiving member for receiving a rod to be connected to the bone screw, the receiving member comprising a receiving part and a mounting part, the receiving part defining an open first bore with a central bore axis and a substantially U-shaped cross-section having two legs; the mounting part can be assembled and mounted to the receiving part to define a second bore communicating with the first bore, the second bore having a bounding edge at an end opposite to the first bore with an opening size that is greater than that of the threaded section to permit passage of the threaded section therethrough and smaller than that of the head to prevent passage of the head therethrough, the mounting part having a seat for the head to permit pivoting of the head relative to the seat; a fastener acting together with the receiving member to secure a rod between the two legs; and wherein the mounting part is positionable to permit the bone screw to pivot at a larger angle at a first location of the bounding edge than at another location of the bounding edge, relative to the axis of the first bore.