Patent ID: 6041485
Filing Date: 2000-03-28
Classification: A61B,B23B,F16B,Y10S,Y10T

Abstract:
A drill for forming an undercut hole in a workpiece, said drill comprising:a shaft having a proximal end, a distal end and a first longitudinal axis;a re-centering element attached to said distal end of said shaft, said re-centering element including a distally-tapering portion centered on a second longitudinal axis parallel to, but laterally spaced from, a projection of said first longitudinal axis;a connecting member centered on said second longitudinal axis, said connecting member having a connecting member proximal end and a connecting member distal end, said connecting member extending distally from said re-centering member and being attached at said proximal end of said connecting member to said distally-tapering portion such that said connecting member and said distally-tapering portion together define a beveled corner centered on said second axis; anda substantially cylindrical drill head centered on an axial projection of said first longitudinal axis, said drill head having a proximal end, a distal cutting tip, an outer surface defining cutting flute means extending between said distal cutting tip and said drill head proximal end, and said drill head having a diameter larger than the diameter of said connecting member; andsaid proximal end of said drill head being eccentrically attached to said distal end of said connecting member.