Flexible Coupling Members for Spinal Stabilization
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Solution Overview
Problem
Existing spinal stabilization systems face challenges in optimal placement and sizing due to geometric and dimensional constraints, limiting their ability to correct spinal deformities while preserving spinal motion.
Innovation Solution
The development of spinal stabilization systems featuring elongated stabilization members and coupling members with deformable hinge portions that allow for flexible attachment and movement, enabling secure stabilization while maintaining limited motion along the spinal column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elongated rigid plates and rods are used for spinal stabilization, then spinal stabilization and fixation is achieved, but the surgeon has limited options in sizing and selection, and optimal placement along the spinal column is prevented
Solution Approach 1:
The coupling member is divided into multiple segments including a first body portion, a second body portion, and a hinge portion connecting them. This segmentation allows each part to be independently sized and configured, providing the surgeon with multiple sizing options while maintaining overall structural integrity for spinal stabilization.
2Reliability
If elongated one-piece spinal rods are used, then spinal stabilization is provided, but the rods are difficult to maneuver into position and provide limited sizing options
Solution Approach 1:
The hinge portion enables dynamic movement between the first and second body portions of the coupling member. This allows the device to flex and adapt during insertion and to conform to the natural curvature of the spinal column, significantly improving maneuverability compared to rigid one-piece rods.
3Reliability
If rigid stabilization devices are used, then spinal fixation is achieved, but spinal motion along the supported levels is completely restricted
Solution Approach 1:
The hinge portion is specifically designed with different properties than the body portions - it is flexible and movable while the body portions remain rigid for secure attachment. This local differentiation allows the coupling member to provide fixation at attachment points while preserving controlled motion in the hinge region, maintaining spinal mobility.
4Adaptability or versatility
If the coupling member includes a deformable hinge portion, then flexibility and adaptability are improved, but the structural complexity increases
Solution Approach 1:
The hinge portion functions as a flexible connection element between the rigid body portions. This flexible section allows the coupling member to bend and adapt to spinal curvature without requiring complex mechanical joints or multiple components, achieving flexibility through a simplified flexible structure.
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
These systems provide improved flexibility and adaptability, allowing for targeted correction of spinal deformities while preserving motion, through the use of deformable hinge portions that adjust to the patient's anatomy, enhancing surgical outcomes.
Implementation Method 1
The coupling member includes a deformable hinge portion between first and second body portions of the coupling member that permits movement of the first and second body portions of the coupling member relative to one another
Implementation Method 2
The coupling member includes at least one hinge portion structured to flex or deform in response to movement of the spinal motion segment along which the stabilization members are attached
Data Source
AI summary
A spinal stabilization system includes a first stabilization member and a second stabilization member engaged to one another in end-to-end fashion. A flexible coupling member allows the spinal stabilization members to be assembled and attached to the spinal column to dynamically support of the stabilized levels of the spinal column.