Dynamic Spinal Connector for Axial Micro-Motion
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Solution Overview
Problem
Current surgical methods for treating spinal disorders, such as scoliosis and kyphosis, often require frequent revisions due to stiffness and premature fusion, which can lead to increased surgical burdens and reduced mobility.
Innovation Solution
A spinal construct with a dynamic axial connector that allows for micro-motion and distraction, utilizing a connector with a cavity for a movable rod to prevent collapse and distribute forces, minimizing friction and wear, and employing a system with rods and tethers for adjustable tension and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rigid spinal fixation implants are used, then spinal stability is improved, but spinal stiffness increases leading to premature fusion and loss of mobility
Solution Approach 1:
The connector incorporates a dynamic axial movement mechanism that allows the rod to move longitudinally within the connector body along a longitudinal axis. This dynamic capability enables the construct to accommodate spinal growth and micro-motion while maintaining stability, resolving the contradiction between rigid fixation and preserved mobility
Solution Approach 2:
The system allows adjustment of rod tension and position parameters to optimize the balance between stability and mobility. The member can be positioned at different locations within the cavity to modify the range of axial movement, enabling parameter optimization for different clinical scenarios
2Manufacturing precision
If traditional fixed spinal constructs are used, then initial alignment is achieved, but frequent revision surgeries are required due to stiffness and premature fusion
Solution Approach 1:
The dynamic axial movement capability allows the construct to adapt to spinal growth and changes over time, preventing premature fusion and reducing the need for revision surgeries. The connector's cavity and member configuration enables continuous adjustment rather than fixed positioning
Solution Approach 2:
The system is designed with pre-configured members at specific locations within the cavity that can be selectively engaged to establish proper alignment from the outset. This preliminary configuration of the dynamic system prevents future alignment issues that would require revision surgery
3Reliability
If rigid connectors are used to stabilize the spine, then spinal alignment is maintained, but friction and wear increase leading to device failure
Solution Approach 1:
The dynamic axial movement mechanism reduces friction and wear by allowing controlled motion between the rod and connector surfaces. The member positioned in the cavity acts as a guide that minimizes lateral contact and wear while maintaining alignment, transforming static friction into controlled dynamic movement
Data Source
AI summary
A spinal construct comprises a connector defining a longitudinal axis and extending between a first end and a second end. The connector defines a cavity and includes a member that is selectively disposable in the cavity at one of a plurality of positions between the ends. A first longitudinal element is dynamically movable within the cavity and engageable with the member to limit movement in a first axial direction. The first longitudinal element is connectable with vertebral tissue. A second longitudinal element is disposable within the cavity and connectable with vertebral tissue. Systems and methods are disclosed.