Dynamic Vertebral Construct Rod Translation Mechanism
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Solution Overview
Problem
Current vertebral constructs used in spinal disorders often fail to provide adequate dynamic stability and flexibility, leading to stress concentration on spinal elements during surgical treatments and healing processes.
Innovation Solution
A vertebral construct featuring a spinal rod connected to fastening elements, such as pedicle screws, with a configuration that facilitates relative dynamic translation and includes damping elements to absorb movement, allowing for multiple axis movement and flexibility during flexion, extension, and torsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid spinal rod is used to provide stability, then structural stability is improved, but stress concentration on spinal elements occurs and flexibility is reduced
Solution Approach 1:
The spinal rod is transformed from a rigid static structure to a dynamic structure capable of relative motion. The rod includes a first portion and a second portion that can translate relative to each other along the longitudinal axis, allowing the construct to adapt to physiological movements while maintaining stability.
Solution Approach 2:
The spinal rod is divided into multiple segments (first portion and second portion) that can move independently relative to each other. This segmentation allows each portion to accommodate different movement requirements and reduces stress concentration at any single point.
2Stability of the object's composition
If a fixed connection between rod and fastening elements is used, then stability is improved, but stress on spinal elements increases and dynamic movement is restricted
Solution Approach 1:
The connection between the rod and fastening elements is made dynamic rather than fixed. The fastening elements are configured to allow relative translation along the longitudinal axis of the rod, enabling stress distribution through movement and reducing peak stress concentrations.
Solution Approach 2:
The design anticipates and accommodates physiological movements and stress loads before they occur. The dynamic configuration allows the construct to absorb and distribute stresses through controlled translation, preventing stress concentration before it can cause damage.
3Adaptability or versatility
If a dynamic configuration with relative translation is used, then flexibility and stress reduction are improved, but device complexity increases
Solution Approach 1:
The dynamic capability is achieved through a relatively simple configuration where the rod is divided into portions that can translate along its longitudinal axis. This approach provides flexibility without requiring complex mechanisms, maintaining ease of manufacture and installation.
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 vertebral construct provides enhanced stability and flexibility, reducing stress on spinal elements, facilitating healing and therapeutic treatment while maintaining structural integrity, and can be used in various surgical approaches and applications.
Implementation Method 1
The vertebral construct includes a damping element disposed within the elongated opening and engageable with the first portion
Data Source
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AI summary
A vertebral construct includes a first fastening element having a first portion and a second portion configured for engagement with tissue. A rod defines an elongated cavity configured to facilitate dynamic translation of the first portion therein relative to the rod. A second fastening element has a first portion fixedly connected to the rod. Methods of use are disclosed.