Patent ID: 9636158
Date: 2017-05-02
CPC Classifications: A61B

Claim:
1. A fixation device comprising: a cannulated elongated body having proximal and distal ends and a hollow shaft extending therebetween, said elongated body including an outer surface adapted to penetrate and anchor within a bone; and a head affixed to the distal end of the elongated body and adapted to mate with a drive component; wherein the outer surface of the elongated body comprises threads extending from the outer surface in a first direction; and wherein at least a portion of the outer surface of the elongated body comprises a reverse spiral cut in a second direction into the threads and through the outer surface, such that the reverse spiral cut penetrates the internal structure of the bone screw to form at least one cavity within the elongated body, the cavity having an axial length and a penetration depth that exceeds the axial length.