Patent ID: 6736820
Filing Date: 2004-05-18
Classification: A61B

Abstract:
A bone screw apparatus comprising:a bone screw having a screw member a threaded section, a head end and a head at the head end; a receiving part at the head end for receiving a rod to be connected to the bone screw, wherein the receiving part has an open first bore with an axis and a substantially U-shaped cross-section having two free legs provided with a thread, and a second bore at an end opposite to the first bore, the second bore having a free end with an edge and a diameter is greater than that of the threaded section and smaller than that of the head, and a seat for the head; and a nut or screw acting together with the thread, wherein, when viewed relative to the axis of the first bore, the edge bounding the free end of the second bore is asymmetric.