Oriented Collagen Films via Shear Alignment
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Solution Overview
Problem
Existing methods for forming collagen films and matrices fail to maintain and preserve the native liquid crystal structure of collagen, limiting their ability to mimic the semi-crystalline structures found in living biological systems, and lack robustness and repeatability in producing collagen-based materials with long-range orientation.
Innovation Solution
The development of monolayers or multilayers comprising crimped fibrils with a uniaxial orientation, formed through a process involving shearing of a concentrated collagen solution, which aligns the fibrils in a specific pattern with controlled orientation, and optionally incorporating additives like ATP to promote orientation, and further enhanced with cross-links for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to form collagen films and matrices, then the collagen can be deposited, but the native liquid crystal structure and long-range orientation are lost
Solution Approach 1:
The patent applies parameter changes by controlling the concentration of collagen solution (using concentrated solutions above the critical concentration for liquid crystal formation), adjusting pH levels, and controlling temperature to maintain the liquid crystal phase during film formation. These parameter optimizations enable the preservation of long-range molecular orientation that conventional methods fail to achieve.
Solution Approach 2:
The patent employs preliminary action by pre-forming the collagen solution in its liquid crystal state before deposition, and by using substrates with pre-established orientation patterns (such as rubbed polyethylene terephthalate or aligned nanofibers). This preliminary preparation ensures that the collagen molecules maintain their oriented structure during the film formation process, rather than forming random networks after deposition.
2Manufacturing precision
If shear force is applied to align fibrils, then uniaxial orientation is achieved, but the process complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the intrinsic properties of concentrated collagen solutions that naturally form liquid crystal phases with spontaneous molecular alignment. The shear force application is simplified to basic techniques such as bar coating, doctor blade methods, or simple substrate movement, allowing the collagen system to self-organize into uniaxial orientation without requiring complex alignment devices or multiple processing steps.
Solution Approach 2:
The patent replaces complex mechanical alignment systems with simpler mechanical approaches. Instead of using sophisticated optical, magnetic, or electric field-based alignment mechanisms, the invention uses straightforward shear forces applied during coating processes, leveraging the rheological properties of concentrated collagen solutions to achieve molecular alignment through simple relative motion between coating tools and substrates.
3Strength
If cross-links are added to enhance stability, then material strength increases, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies self-service by utilizing natural cross-linking mechanisms that occur spontaneously in collagen systems. Collagen molecules contain natural cross-linking sites that form intermolecular bonds without requiring external agents or complex processing. The oriented structure formed during liquid crystal phase deposition promotes spontaneous cross-linking, achieving material stability through the material's inherent properties rather than added chemicals or complex treatment steps.
Solution Approach 2:
The patent optimizes cross-linking by controlling parameters such as pH, temperature, and ionic strength to promote natural cross-linking reactions. By adjusting these parameters within specific ranges, the invention enhances the formation of stable cross-linked networks in the oriented collagen structure without requiring additional cross-linking agents or complex multi-step processing, thereby maintaining ease of manufacture while achieving improved material stability.
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 creation of collagen layers with high uniformity and parallel orientation, maintaining the native liquid crystal structure, enabling the production of collagen-based materials that closely resemble native collagen matrices, thus supporting cell attachment and differentiation.
Implementation Method 1
Collagen matrix in many biological systems has a liquid crystal structure. It is the natural state of the collagen, which provides a long-range orientation.
Implementation Method 2
The development of monolayers or multilayers comprising crimped fibrils with a uniaxial orientation, formed through a process involving shearing of a concentrated collagen solution, which aligns the fibrils in a specific pattern with controlled orientation
Implementation Method 3
optionally incorporating additives like ATP to promote orientation
Implementation Method 4
further enhanced with cross-links for stability
Data Source
Figure 1A~3
Figure 4(a)~6
Figure 7A~7B
AI summary
In general, the present invention is related to collagen compositions and thin films, and to methods of making and using the same. In some embodiments, the present invention is directed to "uniaxial pattern" or "linear pattern" collagen materials, compositions and thin films, and methods of making.