Patent ID: 7819905
Filing Date: 2010-10-26
Classification: A61B

Abstract:
1. A bone screw, comprising: a screw body having proximal and distal ends and a central longitudinal axis, at least a portion of the screw body having an external thread winding about the central longitudinal axis; a head portion connected to the body at the proximal end; a drill point connected to the body at the distal end, the drill point having a first blade and a second blade with the first blade leading the second blade; the first blade having a cutting lip, a primary relief surface trailing from the cutting lip of the first blade having a trailing edge, and a secondary relief surface trailing from the trailing edge of the primary relief surface of the first blade, the secondary relief surface of the first blade having a trailing edge, wherein the trailing edge of the secondary relief surface of the first blade is a straight edge not passing through the central longitudinal axis; the second blade having a cutting lip, a primary relief surface trailing from the cutting lip of the second blade having a trailing edge, and a secondary relief surface trailing from the trailing edge of the primary relief surface of the second blade, the secondary relief surface of the second blade having a trailing edge, wherein the trailing edge of the secondary relief surface of the second blade is a straight edge not passing through the central longitudinal axis; a first flute defined between the trailing edge of the secondary relief surface of the first blade and the cutting lip of the second blade; and a second flute defined between the trailing edge of the secondary relief surface of the second blade and the cutting lip of the first blade; wherein the cutting lip of the second blade and the trailing edge of the secondary relief surface of the first blade define an obtuse angle.