Patent ID: 8888825

Claim:
A bone plate for cooperating with bone screws, each comprising a head and a screw shaft, for fixing parts of a fractured or damaged bone, comprising: a plate body of rigid material, the plate body defining a plate plane and a longitudinal axis, shaped holes extending transversely to the plate plane and including a first round hole and a second round hole that intersect while forming edges, a circumferential radial rib in both of the round holes and projecting from both round holes walls, leading around both round holes, and extending in a plane to the round hole centre, wherein the first round hole in all is larger than the second round hole, and includes: an upper region in bowl shape and including a pertinent section of the circumferential rib adapted to engage with a thread on a screw head of a bone screw, as well as a lower region of truncated cone shape and having a smaller diameter relative to the diameter of the upper region, the lower region serving as a bearing surface for a corresponding conical surface of the screw head.