Cross-Linked Tissue Matrix for Irregular Wound Conformability
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Solution Overview
Problem
Current wound care products, including solid biomimetic scaffolds and injectable materials, face challenges in conforming to irregular wound shapes and sizes, and in providing sufficient strength to support effective wound healing, particularly in complex wounds such as chronic ulcers or burns, leading to prolonged healing times and increased risk of infection.
Innovation Solution
A composition comprising collagen, glycosaminoglycan, and a hydrogel, cross-linked with biocompatible small molecule cross-linkers, which forms a strong, thermally and enzymatically stable matrix that can be reconstituted from a dry powdered form with a physiological fluid, offering improved mechanical strength and adaptability to wound contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solid (sheet) scaffolds are used, then structural strength is provided, but they cannot conform to wounds of irregular shapes and sizes
Solution Approach 1:
The patent changes the physical state parameter of the scaffold from solid sheet to injectable liquid that gels in situ. This allows the material to be administered as a liquid that can flow into and conform to irregular wound geometries, then transform into a gel structure that provides the necessary mechanical strength to support tissue regeneration.
Solution Approach 2:
The scaffold transitions from a static solid sheet to a dynamic system that changes state from liquid to gel in situ. This dynamic transformation allows the material to adapt its form to match the wound geometry while maintaining structural integrity, resolving the contradiction between conformability and strength.
2Adaptability or versatility
If injectable materials are used, then conformability to wound shapes is improved, but mechanical strength is weak compared to surrounding tissue
Solution Approach 1:
The patent creates a composite hydrogel system combining multiple polymers (hyaluronic acid, chitosan, gelatin) with complementary properties. This composite structure provides both the fluidity needed for injection and conformability, while the interconnected polymer network delivers the mechanical strength required to support tissue regeneration and match surrounding tissue properties.
Solution Approach 2:
The hydrogel composition is designed with local quality variations through the selection of specific polymer ratios and crosslinking densities. This allows the material to exhibit liquid-like properties during injection for conformability, then transition to a solid-like gel structure with appropriate mechanical strength at the wound site to support healing.
3Strength
If cross-linking is increased to improve strength, then mechanical stability is enhanced, but biocompatibility may be compromised
Solution Approach 1:
The patent introduces biocompatible crosslinking agents such as genipin and EDC/NHS as intermediaries to form crosslinks between polymer chains. These crosslinkers provide the necessary mechanical stability and structural integrity while being biologically acceptable, thus resolving the contradiction between strength enhancement and biocompatibility maintenance.
Solution Approach 2:
The crosslinking density parameter is carefully controlled and optimized to achieve the desired balance. By adjusting the concentration of crosslinking agents and crosslinking conditions, the patent achieves sufficient mechanical stability for tissue support while maintaining pore structure and biochemical properties that ensure biocompatibility and cellular functionality.
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 composition promotes faster wound healing by forming a stable matrix that enhances tissue regeneration, reduces the risk of infection, and integrates well with the wound site, outperforming existing products like Matrigel in non-healing wound models.
Implementation Method 1
cross-linked with biocompatible small molecule cross-linkers, which forms a strong, thermally and enzymatically stable matrix
Implementation Method 2
which forms a strong, thermally and enzymatically stable matrix that can be reconstituted from a dry powdered form with a physiological fluid
Data Source
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AI summary
Compositions and methods of preparation and use are provided for an engineered tissue substitute system comprising collagen, glycosaminoglycan and hydrogel in a cross-linked matrix. The compositions may be further lyophilized and reconstituted with a physiological fluid prior to use in methods, such as in the treatment of wounds, tissue engineering and cell transplantation.