Dynamization Tab for External Fixation Bone Healing
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Solution Overview
Problem
Existing external fixation devices face challenges in providing controlled dynamization, especially in hexapod-type systems, where introducing dynamization modules reduces stability and can lead to undesirable bone segment translation, hindering bone healing.
Innovation Solution
The dynamization tab incorporates a ring connector, a strut connector, and a biasing mechanism, allowing for controlled axial micromotion and flexibility, which can be adjusted to provide the necessary stabilization and destabilization during the bone healing process, using elastomeric or flexible plastic materials to apply biasing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamization modules are introduced into threaded rods to provide controlled destabilization, then bone healing is accelerated, but the stability of the system is reduced and bone segment translation may occur
Solution Approach 1:
The patent applies parameter changes by using a torsion spring mechanism that can be adjusted to provide different amounts of rotational force. The torsion spring's wire diameter, mean coil diameter, and number of active coils can be modified to control the destabilization intensity, allowing the system to transition from stable to dynamically destabilized states while maintaining controlled stability for bone healing
Solution Approach 2:
The patent implements dynamics by introducing a torsion spring that enables controlled rotational movement between the first and second connecting rods. This dynamic element allows the system to adapt its stability in real-time, providing destabilization forces that stimulate bone healing while preventing excessive bone segment translation through controlled mechanical motion
2Adaptability or versatility
If multiple dynamization modules are used in hexapod-type devices with struts oriented not parallel to each other, then dynamization can be achieved, but the overall stability is reduced without possibility of controlled dynamization
Solution Approach 1:
The patent applies local quality by placing the torsion spring mechanism specifically at the connection between the first and second connecting rods, rather than distributing dynamization elements throughout all six struts. This localized approach provides controlled destabilization at a specific joint while maintaining stability in other parts of the hexapod structure, enabling adaptability without sacrificing overall stability
Solution Approach 2:
The torsion spring acts as an intermediary element between the first and second connecting rods, mediating the transfer of forces and enabling controlled rotational movement. This intermediary mechanism allows the system to achieve dynamization capability while maintaining stability by controlling the interaction between structural components rather than relying on multiple destabilizing elements throughout the entire 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
This solution enables controlled bone dynamization, improving bone strength and healing by allowing for adjustable flexibility and stabilization, optimizing the healing process through gradual loading and pressure application.
Implementation Method 1
using elastomeric or flexible plastic materials to apply biasing forces
Data Source
AI summary
Dynamization tabs and methods of use are provided. Dynamization tabs may be used with an external fixation ring or other fixator device as part of a therapeutic treatment of bone fractures or malformations. The device forms a connection between one or more fixation struts and an external fixation ring so as to introduce controllable amounts of movement or dynamization to the arrangement of the struts and the fixator. By introducing controlled amounts of dynamization, therapeutic benefits can be derived in the enhanced, accelerated bone formation, mineralization and remodeling of the underlying bone. Dynamization tabs may comprise a strut connector, a mechanical biasing or dynamizing device, and a ring connector. Many different forms for introducing controlled amounts of dynamization are disclosed.