Modular Fracture Fixation Plate System with Cylindrical Connectors
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Solution Overview
Problem
Current bone fracture fixation systems face challenges in aligning and stabilizing multiple bone fragments, particularly in metaphyseal fractures, where existing methods like external fixators and modular plating systems are inadequate, leading to potential deformity and limited fixation due to bone quality issues and uneven load distribution.
Innovation Solution
A modular fracture fixation plate system comprising different sized distal radius and fragment plates that are coupled together using set screws, eliminating reliance on bone for locking and minimizing play between components, thereby providing stable and uniform load transfer across the fracture site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If external fixators are used to maintain fracture alignment, then the position of wrist bones can be maintained, but it is difficult to first provide the bones in proper alignment and the system is not suitable for fractures resulting in multiple bone fragments
Solution Approach 1:
The external fixator is divided into multiple independent modular components including clamp assemblies, connection assemblies, and rod segments that can be independently adjusted and configured to match the specific fracture pattern and bone geometry
2Strength
If modular plating systems with dovetail slots and bone screws are used to interconnect plates, then fixation can be provided, but the integrity is subject to loosening through micromotion and bone quality issues
Solution Approach 1:
The connection mechanism is replaced from a mechanical screw-and-slot system to a press-fit cylindrical interface with circumferential ribs that engage corresponding grooves, eliminating threaded fasteners and reducing micromotion-induced loosening
Solution Approach 2:
The connection assembly combines multiple materials including titanium alloy components for the cylindrical connectors, polyethylene insert materials for cushioning and load distribution, and cobalt-chromium alloy ribs for structural integrity and engagement
3Area of stationary object
If two separate plates (fragment plate and distal radius plate) are used for distal and mid-shaft fractures, then coverage of both fracture sites is achieved, but unsupported bone between the plates results in concentrated load
Solution Approach 1:
Two separate plate systems are merged into a single integrated modular construct where the distal radius plate and fragment plate are connected through cylindrical connection assemblies, creating continuous load transfer across the entire fixation span including previously unsupported bone segments
4Strength
If the metaphyseal plate is made significantly thicker and wider to receive the diaphyseal fragment plate, then structural integrity is improved, but an undesirably thick plate and potentially irritating transition are created
Solution Approach 1:
The diaphyseal fragment plate is nested within a cylindrical socket of the metaphyseal plate, with the cylindrical connection assembly fitting inside the metaphyseal plate structure, allowing strength through integrated construction without increasing external plate dimensions
Data Source
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AI summary
A fracture fixation plate system for use on a long bone having a metaphysis and a diaphysis, includes at least one end plate having a head portion for the metaphysis, and at least one fragment plate having a first end and a second end with a plurality of screw holes therebetween. The end plate includes mating structure adapted to mate with and securely couple to at least one end of the at least one fragment plate. The system preferably includes several end plates and fragment plates to accommodate anatomy of various sizes.