Spinal Correction Ratchet Mechanism for Dynamic Growth
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Solution Overview
Problem
Current surgical methods for correcting spinal disorders, such as scoliosis and kyphosis, often require invasive procedures and may not adequately address the need for dynamic adjustment and growth compensation, leading to limitations in long-term stability and patient comfort.
Innovation Solution
A spinal correction apparatus featuring a ratchet mechanism with a longitudinal element that allows incremental movement and expansion, facilitated by a cam or worm gear system, enabling non-invasive lengthening and axial rotation to accommodate patient growth and spinal movement, while minimizing the need for repeated surgical interventions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional surgical correction methods are used, then spinal alignment can be corrected, but repeated surgical interventions are required and patient comfort is compromised
Solution Approach 1:
The spinal correction apparatus incorporates a dynamic ratchet mechanism that allows the spinal rod to be adjusted incrementally after implantation. The ratchet pawl engages with rack teeth to permit lengthening movements while preventing shortening, enabling the system to adapt to patient growth and spinal changes without requiring removal and re-implantation of the hardware.
Solution Approach 2:
The apparatus enables self-adjustment through a controlled ratcheting mechanism that allows incremental lengthening of the spinal rod in response to patient growth. The system automatically maintains correction while accommodating changes, eliminating the need for repeated surgical interventions to adjust the implant.
2Adaptability or versatility
If fixed spinal implants are used, then initial correction is achieved, but they cannot accommodate patient growth and spinal movement
Solution Approach 1:
The spinal correction apparatus transforms a static implant into a dynamic system through the integration of a ratchet mechanism. This allows the spinal rod to change length incrementally in response to patient growth while maintaining structural integrity and correction, providing adaptability without requiring a completely different implant system.
Solution Approach 2:
The apparatus divides the spinal rod into segments that can move relative to each other through the ratchet mechanism. This segmentation allows independent adjustment of rod length while maintaining the overall structural framework, enabling growth accommodation without compromising the fixed correction achieved by the anchored portions.
3Manufacturing precision
If invasive surgical procedures are used, then spinal correction can be achieved, but the frequency of surgical adjustments increases
Solution Approach 1:
The ratchet mechanism enables the spinal implant to self-adjust to patient growth through controlled incremental lengthening. This eliminates the need for repeated surgical interventions to accommodate growth, as the system automatically adapts while maintaining the precision of the original correction through the ratcheting action that prevents backward movement.
Solution Approach 2:
The apparatus is pre-configured with a ratchet mechanism that anticipates future growth needs. The mechanism is designed to allow forward adjustment for growth while preventing backward movement, thereby preparing the system in advance for accommodation of patient development without requiring subsequent surgical revisions.
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 apparatus provides a minimally invasive solution for dynamic spinal correction and growth compensation, enhancing patient comfort and reducing the frequency of surgical adjustments, thereby improving the long-term stability and effectiveness of spinal treatments.
Implementation Method 1
A ratchet is disposed with the body. A longitudinal element is connected to the ratchet. A force is applied to at least a portion of the apparatus that causes dynamic incremental movement of the longitudinal element relative to the body in at least one direction.
Implementation Method 2
A rotatable cam is engageable with the inner sleeve in a configuration to facilitate incremental movement of the rod relative to the outer sleeve in a first axial direction.
Implementation Method 3
A worm gear is engageable with the screw in a configuration to facilitate incremental movement of the rod relative to the outer sleeve in a first axial direction and a second axial direction.
Implementation Method 4
An expansion force is applied to the first end of the rod, which causes incremental movement of the rod, independent of the cam, relative to the outer sleeve in the first axial direction.
Data Source
AI summary
A spinal correction apparatus comprises a body. A ratchet is disposed with the body. A longitudinal element is connected to the ratchet. A force is applied to at least a portion of the apparatus that causes dynamic incremental movement of the longitudinal element relative to the body in at least one direction. Methods of use are disclosed.