Composite Collagen Hydrogel for Corneal Transplantation
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Solution Overview
Problem
Current collagen-based scaffolds for tissue engineering are either too soft or too brittle, lacking mechanical robustness and bio-interactivity, and existing ophthalmic devices face challenges in integrating with corneal tissue and delivering therapeutics effectively, especially in high-risk applications like corneal transplantation where low drug penetration and graft failure are concerns.
Innovation Solution
A composite collagen hydrogel material is developed, comprising a first and second collagen network crosslinked with different agents, and a three-dimensional collagen mesh, which are physically and chemically interconnected to enhance mechanical strength, elasticity, and biocompatibility, allowing for controlled degradation and therapeutic delivery while maintaining optical transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical crosslinking techniques are used to strengthen collagen scaffolds, then mechanical strength is improved, but the scaffolds become either too soft or too brittle and lose bio-interactivity
Solution Approach 1:
The invention divides the collagen scaffold into multiple networks with different crosslinking degrees. Some regions are heavily crosslinked for mechanical strength, while other regions remain lightly crosslinked or uncrosslinked to maintain bio-interactivity and cell interaction capabilities. This segmentation allows simultaneous optimization of both mechanical properties and biological functionality.
Solution Approach 2:
The invention creates a composite collagen scaffold consisting of multiple collagen networks with different crosslinking characteristics. By combining crosslinked and non-crosslinked collagen networks, the scaffold achieves a composite structure that provides both mechanical robustness and biological activity, resolving the contradiction between strength and bio-interactivity.
2Strength
If collagen is extracted and purified for scaffold use, then mechanical robustness in vivo is achieved, but the collagen rapidly degrades and loses mechanical toughness and elasticity
Solution Approach 1:
The invention applies crosslinking treatment to collagen before scaffold fabrication and implantation. This preliminary crosslinking stabilizes the collagen structure by preserving natural crosslinks and forming additional stable crosslinks, preventing rapid degradation that would otherwise occur after extraction and purification. The pre-crosslinked collagen maintains mechanical toughness and elasticity throughout the intended duration of the scaffold's function.
3Ease of manufacture
If a stromal scaffold alone is used in corneal transplantation, then extracellular matrix replacement is achieved, but integration into surrounding tissue is limited and graft failure occurs due to inflammation and neovascularization
Solution Approach 1:
The invention creates a multi-functional corneal implant with different regions having different properties. The stromal scaffold provides structural support and ECM replacement, while integrated epithelial layers provide barrier function and prevent neovascularization. This local differentiation of functions within the implant improves overall graft integration and reliability without significantly complicating the manufacturing process.
4Ease of operation
If topical therapeutic agents are administered for corneal transplantation, then anti-inflammatory and anti-angiogenic treatment is provided, but drug penetration through corneal epithelium is low resulting in 1-7% bioavailability
Solution Approach 1:
The invention uses the corneal implant itself as an intermediary carrier for therapeutic agents. Drugs are incorporated into the implant matrix during fabrication, allowing controlled release directly at the implant site. This eliminates the need for topical administration and bypasses the epithelial barrier, dramatically improving drug bioavailability while maintaining ease of operation through a single surgical implantation procedure.
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 composite collagen hydrogel material provides a robust, elastic, and biocompatible scaffold that supports tissue integration and therapeutic delivery, improving the success rates of corneal transplantation by enhancing mechanical properties and bioavailability of drugs, while maintaining optical clarity and non-toxicity.
Implementation Method 1
a first collagen network comprising collagen crosslinked with a first crosslinking agent, and/or a second collagen network comprising collagen crosslinked with a second crosslinking agent
Implementation Method 2
a three dimensional collagen mesh comprising partially and plastically compressed collagen hydrogel with a compression degree of 50-95%
Data Source
AI summary
A composite collagen hydrogel material for use in tissue engineering, and an implantable ophthalmic device comprising such composite material. The composite material comprises: a first collagen network comprising collagen crosslinked with a first crosslinking agent, and/or a second collagen network comprising collagen crosslinked with a second crosslinking agent, and a three dimensional collagen mesh comprising partially and plastically compressed collagen hydrogel with a compression degree of 50-95%, wherein the three dimensional collagen mesh is embedded in the first collagen network and/or second collagen network, and the first collagen network and/or the second collagen network and the three dimensional collagen mesh are physically and chemically interconnected in the composite collagen hydrogel material.