Magnetic Spinal Distraction Rod for Scoliosis Correction
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Solution Overview
Problem
Current treatments for scoliosis, such as bracing and fusion surgery, have limitations including patient compliance issues with bracing, potential ineffectiveness of bracing in stopping curve progression, and long-term limitations in spinal flexibility and potential pain after fusion surgery.
Innovation Solution
A spinal distraction system comprising a distraction rod with a threaded recess and an adjustable portion containing a magnetic assembly and lead screw, allowing for non-fusion, adjustable distraction of the spine to correct scoliotic curves without the need for fusion surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fusion surgery is performed to correct scoliosis, then the spinal curve is corrected, but spinal flexibility is reduced and long-term pain may occur
Solution Approach 1:
The patent employs a dynamic distraction rod system that allows continuous adjustment of the distraction force applied to the spinal curve. The rod can be modified in length and positioning to adapt to changing spinal conditions, enabling the system to maintain correction while preserving flexibility through controlled, adjustable distraction rather than rigid fusion.
Solution Approach 2:
The invention changes the physical parameters of the distraction rod, including its length, position, and the magnitude of distraction force applied. By systematically varying these parameters, the system achieves effective curve correction while maintaining spinal mobility, avoiding the permanent rigidity associated with fusion surgery.
2Ease of operation
If bracing is used to treat scoliosis, then treatment is non-invasive, but patient compliance is poor and curve progression may continue
Solution Approach 1:
The patent replaces the passive mechanical bracing system with an active, adjustable distraction rod system. Instead of relying on patient compliance to wear braces, the distraction rod provides active, controlled distraction forces that mechanically counteract curve progression, substituting the unreliable passive bracing mechanism with an actively managed surgical intervention.
3Adaptability or versatility
If adjustable distraction is implemented, then spinal flexibility is maintained, but device complexity increases
Solution Approach 1:
The distraction rod system is divided into separable components including the rod itself, attachment mechanisms to the spine, and adjustment mechanisms. This segmentation allows for simplified adjustment procedures and easier maintenance while maintaining the overall functionality of the flexible correction system, reducing the practical complexity despite the adjustable nature of the device.
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 spinal distraction system provides a minimally invasive, adjustable solution for correcting scoliotic curves, potentially reducing the need for fusion surgery, improving patient compliance, and maintaining spinal flexibility, while also addressing the challenges of rapid curve progression and long-term spinal issues.
Implementation Method 1
The adjustable portion includes a housing containing a magnetic assembly, the magnetic assembly affixed at one end thereof to a lead screw
Implementation Method 2
the lead screw operatively coupled to the threaded portion
Data Source
AI summary
A spinal distraction system includes a distraction rod having a first end and a second end, the first end being configured for affixation to a subject's spine at a first location, the distraction rod having a second end containing a recess having a threaded portion disposed therein. The system further includes an adjustable portion configured for affixation relative to the subject's spine at a second location remote from the first location, the adjustable portion comprising a housing containing a magnetic assembly, the magnetic assembly affixed at one end thereof to a lead screw, the lead screw operatively coupled to the threaded portion. A locking pin may secure the lead screw to the magnetic assembly. An O-ring gland disposed on the end of the housing may form a dynamic seal with the distraction rod.