Patent ID: 7690282
Filing Date: 2010-04-06
Classification: A61B,A61C,B25B

Abstract:
1. A tool for rotating and retaining a screw comprising: a shaft having a longitudinal axis, a proximal end, and a distal end; a tip connected to the proximal end of the shaft having at least a first blade and a second blade, wherein each blade defines a plane, the plane of the first blade and the plane of the second blade are perpendicular to the longitudinal axis of the shaft, on opposing sides of the longitudinal axis, and are parallel to each other and offset with respect to the longitudinal axis in a direction perpendicular to their plane for collectively engaging a non-offset portion of the screw to create an interference fit between the tip and the screw, wherein (i) at least one blade has a two stage taper, and (ii) the narrowest point of the taper is at the proximal end of the tool allowing the effective thickness of the blade to increase as it is inserted into the screw to thereby create a better fit between the screw and the blade.