Patent ID: 7325470
Filing Date: 2008-02-05
Classification: A61B,B25B

Abstract:
1. A surgical screw and screw driver, comprising: a screw having a head and a insertion tip and a threaded portion with a longitudinal axis and having a major diameter defined by a spiraling thread and a minor diameter, the head having a terminal surface joined by a radiused area to a side wall further joined to the threaded portion, the terminal surface including a torque driving recess having a bottom wall with an opening along the longitudinal axis, the torque driving recess having a first cross sectional shape in the direction transverse to the longitudinal axis and the opening having a second cross sectional shape in the direction transverse to the longitudinal direction of the axis, the screw being made from surgical stainless steel or titanium; and a screw driver having a handle, a shaft and a torque driving head having a shape corresponding to the shape of the torque driving recess in the screw and terminating in a unitary pilot which has a frictional fit in the opening; wherein the cross-sectional shape of the opening and of the pilot is circular in a direction transverse to the longitudinal axis and the cross-sectional shape of one of the opening and the pilot defines a dimension which is constant along the longitudinal axis and the other defines a dimension which continuously decreases along the longitudinal axis toward the bottom of the opening or the pilot.