Patent ID: 8702707
Filing Date: 2014-04-22
Classification: A61B

Abstract:
1. A fixation instrument for treating a bone fracture comprising: a nail member, having a longitudinal axis, a distal end and a proximal end, said proximal end having a transverse aperture extending therethrough and said nail member having a chamber located in said proximal end; a bone screw, having a threaded portion, said bone screw extending through said aperture; an insert having a longitudinal axis, a distal end, a proximal end and a passageway extending longitudinally through said insert from said proximal end to said distal end, said insert having a retaining member located on said proximal end of said insert, said insert positioned and constrained against rotation about said longitudinal axis of said insert within said chamber; a locking ring, having a longitudinal passageway extending therethrough, said locking ring including a lower surface having an engagement portion, said locking ring received in said chamber and said engagement portion engaging said retaining member of said insert to attach said locking ring to said insert, said locking ring operative to secure said insert within said chamber; and said bone screw having a longitudinal axis and having a plurality of longitudinally extending grooves, said grooves extending substantially parallel to said longitudinal axis of said bone screw on an outer surface of said bone screw wherein at least a portion of said distal end of said insert is received in one of said grooves to resist rotation of said bone screw within said aperture.