Patent ID: 8282673
Filing Date: 2012-10-09
Classification: A61B,F16B

Abstract:
1. In combination a bone implant screw adapted for connection to a bone fixation structural member and a closure for setting engagement with the structural member; said closure comprising: (a) a substantially cylindrical body having an outer cylindrical surface relative to a central closure axis; (b) a substantially continuous guide and advancement flange extending helically about said outer cylindrical surface and being sized and shaped to interlock with a discontinuous mating guide and advancement flange on a receiving structure; said continuous flange having a leading surface and a trailing surface relative to a direction of forward advancement; said leading surface slopes rearwardly from said body and is free of engagement with an opposed surface of the mating guide and advancement flange; the trailing surface is compound in contour and has a substantially horizontal loading surface adjacent the body and an outward raised portion with a top that remains unloaded when in use; (c) said body having a multi-surface aperture formed therein that is aligned with said closure axis and that is elongated along said closure axis, said aperture opening onto a trailing surface of said body and including a plurality of circumferentially spaced, centrally facing surfaces extending substantially parallel to said closure axis that are aligned to form a removal socket adapted to receive a removal tool; (d) a break off installation head.