Bone Plate With Segmented Through Hole For Variable Angle Screw Insertion
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Solution Overview
Problem
Bone screws inserted at angles other than coaxially can damage the internal thread of bone plates, leading to instability in osteosynthesis procedures.
Innovation Solution
A bone plate design featuring a through hole with three or more straight or convex sections with thread-like structures, allowing for variable angle insertion of bone screws without damaging the thread, and including peripheral holes for additional screw placement at fixed or variable angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bone screw is inserted at an angle other than coaxially with respect to the through hole axis, then the ease of operation is improved, but the thread of the through hole is damaged
Solution Approach 1:
The through hole wall is segmented into three or more straight or convex sections, each provided with projections such as thread or thread-like structures. This segmentation allows the screw to be inserted at variable angles while distributing the loading across multiple threaded sections, preventing damage to any single thread region.
Solution Approach 2:
The bone plate design transitions from a fixed coaxial insertion requirement to a dynamic system that accommodates variable insertion angles. The multiple threaded sections on the through hole wall enable the screw to engage at different angles, making the system adaptable to surgical variability while maintaining thread integrity.
2Adaptability or versatility
If the through hole accepts variable angle insertion, then the adaptability is improved, but the manufacturing precision required is increased
Solution Approach 1:
Different sections of the through hole wall are given different local qualities - each of the three or more sections is provided with thread or thread-like structures with specific geometric characteristics. This local differentiation enables variable angle insertion while the overall symmetry maintains manufacturing feasibility.
Solution Approach 2:
The through hole incorporates asymmetric threaded sections that can accommodate screws at different angles. The three or more straight or convex sections with thread-like structures create an asymmetric thread pattern that allows for angular variability while maintaining functional symmetry for load distribution.
Data Source
AI summary
A bone plate includes a first through hole extending through the plate along a first longitudinal axis from a proximal surface of the plate to a bone-facing distal surface thereof which, when the plate is placed on a target portion of bone in a desired orientation, faces the bone. An outer wall of the first through hole includes three wall sections provided with projections for receiving a screw head of a bone screw. The three wall sections are straight or convex.