| 主权项 |
1. A bone plating system adapted for contacting at least a portion of a bone, the plating system comprising:
a plate including a body having a span sufficient to overlap a portion of the bone, the body having a lower surface for placement against the bone and an upper surface opposite the lower surface; a screw hole extending through the body from the upper surface through the lower surface, the screw hole being adapted to receive a bone screw to attach for engaging the plate to the bone; wherein the screw hole including a counterbore having a beveled surface that intersects at a pinch point a bore having a conical surface of revolution that transitions into the lower surface; wherein the beveled surface has a variable geometry defining alternating linear contact bone screw regions and arcuate non-contact bone screw regions that are interleaved and rotationally-spaced; wherein the beveled surface comprises an uninterrupted, circumferentially continuous surface; a screw configured to be inserted into the bone, the screw having a head region configured to be secured within the screw hole and an elongated body extending therefrom to a distal end of the screw, the elongated body including a threaded portion for engaging the bone; wherein the screw includes a proximal root portion of the head region, the proximal root portion having a sloping radial surface ending in a continuous rib which radially projects from the screw; and wherein the pinch point flexibly captures the screw to limit axial travel by a detented engagement between the pinch point and a junction of the sloping radial surface and the continuous rib. |
