Beveled Bone Screw Head for Flush Oblique Fixation
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Solution Overview
Problem
Existing screws with beveled heads can protrude above the bone, leading to skin tears and potential infections due to undesired bumps along the bone surface.
Innovation Solution
A screw design featuring a beveled head with a dome-shaped, elliptical profile and a central longitudinal axis, allowing for a smooth transition with the bone surface, minimizing protrusion and reducing skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the screw is angled at an oblique angle relative to the bone axis to obtain proper connection, then the connection between adjacent bones or bone fragments is improved, but the screw head extends above the bone surface causing undesired bumps and potential skin tears
Solution Approach 1:
The screw head is designed with a beveled surface that transitions to a rounded contour, creating a dome-shaped profile. This curvature allows the screw head to blend smoothly with the bone surface when implanted at oblique angles, eliminating sharp edges that could cause skin irritation while maintaining the necessary connection strength between bone fragments.
2Object-affected harmful factors
If the screw head is designed to be flush with the bone surface to reduce skin irritation, then skin tears and infections are reduced, but the ability to properly connect adjacent bones at oblique angles is compromised
Solution Approach 1:
The screw head incorporates different surface qualities in different regions: a beveled interface region for optimal bone engagement and connection strength, transitioning to a rounded dome-shaped outer surface that provides a smooth contour flush with the bone. This local differentiation allows the screw to simultaneously achieve secure oblique-angle fixation and minimize skin irritation.
Data Source
AI summary
A screw includes a screw head having a bevel and an elongate shaft attached to the screw head. The shaft has a central longitudinal axis. A tip is attached to the shaft, distal from the head. A method in implanting the screw into a bone or bone fragment is also disclosed.