Bone Plate Spherical Bulge for Angular Screw Fixation

The patent applies local quality by creating a bulge only in the specific region where screw holes are located, rather than making the entire plate thicker. This localized thickening provides the necessary space for angular screw positioning and prevents screw head protrusion, while maintaining the original thin plate thickness in other regions, thus preserving versatility for different fracture fixation applications.

The patent resolves this contradiction by moving the solution from the vertical dimension (screw head height) to the horizontal dimension (plate thickness at screw location). By creating a bulge that extends laterally at the screw hole region, the patent provides space for the screw head without requiring reduction of screw head height, thereby maintaining both tissue compatibility and mechanical connection strength.

The patent applies asymmetry by creating a non-conical, asymmetric bulge shape that is specifically adapted to accommodate angular screw positioning. Unlike symmetric conical extrusions that require concentricity and limit angle ranges, the asymmetric bulge design provides asymmetric clearance space that allows screws to be inserted at various angles relative to the plate surface, thereby increasing the range of motion and adaptability.

The patent applies preliminary action by incorporating the bulge into the plate during the initial forming or molding process, rather than adding it as a separate post-processing step. This integrated approach allows the complex shaped bulge to be created simultaneously with the plate itself, avoiding additional manufacturing operations and reducing overall manufacturing complexity despite the geometric complexity of the feature.