Mechanochemical Collagen Assembly via Extensional Strain
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Solution Overview
Problem
Current methods for repairing or replacing compromised load-bearing collagenous tissues, such as ligaments and tendons, are limited due to a lack of understanding of collagen fibrillogenesis and the inability to reproduce collagenous structures de novo, leading to inadequate tissue engineering solutions for conditions like intervertebral disc degeneration, tendon ruptures, and collagen-related diseases.
Innovation Solution
Applying controlled extensional strain and shear strain to a prefibrillar structural protein solution induces organization into an array of fibrils, using methods and devices like microfluidic systems to generate highly aligned collagen and elastin fibrils, which can be further refined through recrystallization and cross-linking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If seeded cells are used to direct collagen production, then tissue engineering constructs can be formed, but the organization and morphology of collagen remain poor and clinically viable constructs have not been produced
Solution Approach 1:
The patent replaces the biological mechanism (seeded cells directing collagen production) with a mechanical field approach (applying controlled extensional and shear strains to prefibrillar collagen solutions). This mechanical substitution enables precise control over collagen fibril organization, diameter, and alignment without relying on cellular processes, thereby achieving both manufacturing precision and clinical viability.
Solution Approach 2:
The patent systematically varies mechanical parameters (extensional strain rate, shear strain rate, strain magnitude) and solution parameters (pH, ionic strength, temperature, collagen concentration) to control collagen fibrillogenesis. By optimizing these parameters, the method achieves superior collagen organization and morphology that mimics native tissue, resolving the contradiction between manufacturing precision and clinical viability.
2Adaptability or versatility
If limited methods are used to repair compromised collagenous tissues, then some repair capability is maintained, but the ability to reproduce collagenous structures de novo is insufficient
Solution Approach 1:
The patent applies preliminary mechanical strain to prefibrillar collagen solutions before complete fibrillogenesis occurs. This preliminary action during the assembly process enables precise control over fibril organization and morphology, allowing reproduction of native collagenous structures with high fidelity while maintaining versatility in repairing various compromised tissues.
Solution Approach 2:
The patent employs dynamic mechanical loading during collagen assembly, where extensional and shear strains are applied in specific sequences and magnitudes. This dynamic approach allows real-time control over fibril formation, enabling both versatile tissue repair applications and precise reproduction of native collagen structures.
3Manufacturing precision
If extensional strain and shear strain are applied to prefibrillar solution, then organized array of fibrils is produced, but control over strain parameters is required to achieve optimal organization
Solution Approach 1:
The patent uses microfluidic devices with controlled fluid flow to apply extensional and shear strains to prefibrillar collagen solutions. The hydraulic system enables precise control over strain parameters through flow rate regulation, achieving optimal fibril alignment while maintaining relatively simple device architecture that can be manufactured and operated without excessive complexity.
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 approach allows for the production of highly organized, biological, and mechanically functional collagen arrays that mimic native tissue structures, enabling effective tissue repair and regeneration by controlling fibril alignment and organization at the nanoscale.
Implementation Method 1
applying a controlled extensional strain and shear strain to a prefibrillar structural protein solution can induce the prefibrillar solution to organize into an array of fibrils
Implementation Method 2
applying a controlled extensional strain and shear strain to a prefibrillar structural protein solution can induce the prefibrillar solution to organize into an array of fibrils
Implementation Method 3
creating a fluid flow through the prefibrillar solution to produce a controlled extensional strain and shear strain to the collagen and/or elastin prefibrils
Implementation Method 4
which can be further refined through recrystallization and cross-linking
Data Source
AI summary
Methods and devices are described for using a controlled extensional strain to organize prefibrillar collagen and/or elastin solutions into an organized array of fibrils. The organized array of collagen fibrils produced by the disclosed methods and devices can be used for tissue engineering applications.