Hexagonal Spinal Stabilization Connector for Discrete Orientation
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Solution Overview
Problem
Conventional spinal stabilization rods lack the ability to be positioned at discrete orientations, leading to ineffective force distribution and stability due to their circular cross-section and tangential seating with set screws, which complicates achieving optimal performance in spinal stabilization.
Innovation Solution
A spinal stabilization connector with a hexagonal cross-section and curved portion, featuring discrete planar sidewalls that allow for multiple orientations and a planar interface with locking screws for improved force distribution, enabling secure positioning and optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a circular cross-section rod is used, then the surgeon has great degree of freedom in orientating the rod, but the rod cannot be positioned at discrete orientations
Solution Approach 1:
The rod is changed from a symmetric circular cross-section to an asymmetric polygonal cross-section (triangle, rectangle, or pentagon). This asymmetric shape provides discrete flat surfaces that can be positioned at specific orientations within the receiver channel, enabling precise angular positioning while still allowing multiple orientation options through the asymmetric geometry.
2Reliability
If a set screw with planar surface is used to secure the rod, then the rod can be locked in position, but the contact forces are focalized or poorly distributed
Solution Approach 1:
The rod's polygonal cross-section provides flat surfaces that create broader contact areas with the set screw, distributing the locking forces more evenly across the rod surface rather than concentrating them at a single point, thereby reducing stress concentration while maintaining secure locking.
3Manufacturing precision
If a polygonal cross-section connector is used, then discrete orientations are achieved, but the connector shape becomes more complex
Solution Approach 1:
The connector adopts simple polygonal shapes (triangle, rectangle, or pentagon) that provide discrete flat surfaces for precise angular positioning. These geometric forms achieve the desired orientation control while maintaining relatively simple manufacturing processes and structural integrity.
Data Source
AI summary
A bio-compatible stabilization system includes one or more inserters and a spinal stabilization connector for traversing a space between one or more bony structures. The stabilization system is designed to reduce or eliminate stress shielding effects while functioning as a tension band. The stabilization rod is shaped to define a fixed number of discrete positions of orientation.