Orthopedic Fastener With Segmented Apertures For Non-Coplanar Rod Alignment
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Solution Overview
Problem
Current spinal fixation assemblies face challenges in providing a stable and strong spatial relationship for vertebrae alignment, especially when fixation rods are not geometrically aligned, leading to mechanical instability and difficulties in accommodating non-coplanar or divergent alignments.
Innovation Solution
A bone fixation assembly with a screw head featuring a first aperture of 'U' shape and a second aperture of 'C' shape, both with female threads, allows for secure engagement of longitudinal members using compression members, providing augmented support and stability by allowing alignment and securement of multiple fixation rods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional single-aperture screw heads are used to secure fixation rods, then the device complexity is low, but the stability and mechanical strength are insufficient when rods are non-coplanar or divergent
Solution Approach 1:
The screw head is segmented into multiple apertures (first aperture and second aperture) positioned at different locations and orientations. Each aperture can independently secure a fixation rod, allowing the system to accommodate non-coplanar or divergent rod alignments while maintaining mechanical strength without requiring a single complex multi-functional component
2Adaptability or versatility
If multiple separate components are used to accommodate non-coplanar rod alignments, then the adaptability is improved, but the device complexity and number of components increase
Solution Approach 1:
Multiple apertures for securing fixation rods are merged into a single integrated screw head structure. This consolidation provides adaptability for non-coplanar and divergent rod alignments while reducing the overall number of separate components compared to using multiple independent fixation elements
Solution Approach 2:
The screw head is designed with universal multi-functionality by incorporating multiple apertures that can accommodate fixation rods in various orientations and positions. This single component can handle different alignment scenarios (coplanar, non-coplanar, divergent) that would otherwise require different specialized components
3Reliability
If fixation rods are rigidly clamped to ensure stability, then the reliability is improved, but the ease of operation and adjustment during surgery is reduced
Solution Approach 1:
The compression member incorporates a dynamic adjustment mechanism with a ratchet or click-stop system that allows the surgeon to progressively tighten and secure the fixation rod during surgery, then locks it in place to prevent loosening. This provides both ease of operation during installation and reliable stability once secured
Data Source
AI summary
The present invention includes an apparatus, kit and method for providing a bone fixation assembly for attachment to a bone to provide augmented support. The bone fixation assembly includes a screw having a screw head and a threaded shank. A first aperture is positioned about the screw head to receive a first longitudinal member and a first compression member that engages the first aperture to secure the first longitudinal member. The screw head has a second aperture positioned to receive a second longitudinal member and a second compression member that engages the second longitudinal member aperture to secure the second longitudinal member and provide augmented support.