Patent ID: 8623060
Filing Date: 2014-01-07
Classification: A61B

Abstract:
1. A bone screw apparatus comprising: a small bone screw having an elongate shank of a predetermined high strength alloy material and including proximal and distal ends thereof; external threads along the shank having a predetermined outer diameter, wherein the predetermined outer diameter is in a range of approximately 6.5 mm at a minimum diameter thereof up to a maximum diameter of approximately 7.5 mm; a predetermined inner diameter of the threads having a range of sizes between a minimum and a maximum thereof with thread depths defined between the outer and inner diameters of the threads; a generally annular wall of the shank having a predetermined wall thickness; an axial throughbore of the shank having a predetermined diameter of 3.4 mm; and a first predetermined screw performance ratio defined by dividing the inner diameter of the threads by the diameter of the axial throughbore in the shank, the first ratio being less than approximately 1.5, to maximize the size of the axial throughbore to permit a relatively large and stiff guide wire to be inserted therethrough.