Importance

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Abstract

A system and method for attaching a bone plate to bone using specialized bone screws. A bone plate is provided that contains at least one screw aperture. The wall that defines the screw aperture is torically curved. A similarly torically curved collar element is inserted into each screw aperture. Bone screws are provided. Each bone screw has a top end, a bottom end and external threads that extend between the top end and the bottom end. The threads have a constant pitch and thread diameter between the first end and the second end. However, each bone screw has a shaft diameter that increases from its bottom end to its top end. As the coil element advances on the bone screw, its diameter increases. Eventually, the coil element engages the collar element and expands the collar element.

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First Claim