Patent ID: 8632545

Claim:
A bone plate assembly comprising a bone plate and bone screws wherein: (a) said bone plate comprises, an upper surface, a bone contacting lower surface, and a plurality of holes to receive bone screws, at least one said hole being a combination hole, and (b) said bone screws comprise at least one combination bone screw for the compression and stabilization of fragments of a fractured bone, wherein said combination hole comprises: a first depth section extending from the bone contacting lower surface of said plate, having an elongated slot oriented along a longitudinal axis of said plate, extending from the bone contacting lower surface of the plate through a partial thickness of said plate, a second intermediate depth section that comprises a ramp, and a third depth section that comprises a conical bored hole extending from the second intermediate depth section to a circular periphery of the upper surface of the plate, the conical bored hole having a smaller diameter, D 1 , and a larger diameter, D 2 , and comprising circumferential, multi-start, conical threads in the bored hole extending entirely around the circular periphery of the bored hole, wherein the smaller diameter of the bored hole, D 1 , is greater than or equal to the length of the slot along the longitudinal axis, with a surface of the smaller diameter D 1 forming a bearing surface that is circumferential to an upper edge of the ramp.