Spinal Stabilization Connecting Element Shear Force Management
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Solution Overview
Problem
Existing spinal stabilization devices fail to provide dynamic resistance to shear forces while allowing motion in various directions while maintaining spinal column stabilization and structural integrity.
Innovation Solution
A spinal stabilization system featuring elongated connecting elements with end members and a resilient intermediate element, along with a flexible tether, that disperses shear forces and allows movement in multiple planes, including extension, flexion, and lateral bending, by engaging the resilient element within cup-shaped flanges or protuberances and indentations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connecting element is used to resist spinal loading, then spinal stabilization is improved, but spinal motion is lost
Solution Approach 1:
The connecting element transitions from a static rigid structure to a dynamic system with multiple degrees of freedom. The resilient intermediate element and flexible tether allow the device to adapt its stiffness and motion characteristics based on loading conditions, providing rigidity when needed and flexibility when motion is required
Solution Approach 2:
The connecting element is divided into distinct functional segments: end members for anchor engagement, a resilient intermediate element for controlled deformation, and a flexible tether for tension resistance. This segmentation allows each component to specialize in specific functions, achieving both stabilization and motion preservation
2Adaptability or versatility
If a flexible connecting element is used to permit spinal motion, then spinal adaptability is improved, but resistance to shear forces is reduced
Solution Approach 1:
The connecting element combines materials with different mechanical properties: the resilient intermediate element provides compressive and shear resistance through elastic deformation, while the flexible tether provides tensile strength. This composite structure achieves both flexibility for motion and sufficient force resistance
Solution Approach 2:
The device dynamically adjusts its mechanical response based on the type of loading applied. Under shear forces, the resilient element deforms to absorb energy while the tether remains taut to provide resistance, creating a dynamic force-resistance mechanism that adapts to varying load conditions
3Adaptability or versatility
If the connecting element allows motion in multiple directions, then spinal versatility is improved, but structural integrity is compromised
Solution Approach 1:
The connecting element employs dynamic stabilization where the resilient intermediate element and flexible tether work together to maintain structural integrity during motion. The system adapts its stiffness characteristics based on the magnitude and direction of applied forces, providing stability when needed while allowing physiological motion
Solution Approach 2:
The resilient intermediate element is configured with a curved or cylindrical geometry that allows rotation and bending in multiple directions while maintaining structural coherence. This geometric design enables multi-axial motion without compromising the integrity of the connecting element
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively stabilizes the spinal column by minimizing radial displacement and preventing tether abrasion, while allowing for natural spinal motion and distributing shear forces, thus maintaining structural integrity and reducing the risk of tether abrasion.
Implementation Method 1
a resilient intermediate element positioned between and flexibly connecting the end members to one another
Data Source
AI summary
An elongated connecting element and system for dynamic spinal stabilization is disclosed. The connecting element and system provides for resistance to shear forces applied to the connecting element as well as provides for rotational stability of a resilient intermediate element disposed between two end members.