Silica-Collagen Composite Ocular Device for Tissue Integration
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Solution Overview
Problem
Current artificial corneas lack mechanical strength, biocompatibility, and integration with surrounding tissues, leading to complications such as host tissue melting and intraocular infections due to their poor bio-integration and lack of epithelialization.
Innovation Solution
A silica-based composite material incorporating fibrillar proteins like collagen, which forms a hybrid matrix that enhances mechanical strength, optical transparency, and biocompatibility, allowing for tissue and cell growth, and can be used in corneal implants or contact lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional artificial cornea materials are used, then the device can provide basic optical transparency, but the mechanical strength and biocompatibility are insufficient leading to host tissue melting and intraocular infections
Solution Approach 1:
The patent employs a composite material system consisting of a biocompatible polymer matrix (such as silicone or polyacrylate) reinforced with inorganic filler particles (such as silica, glass ions, or hydroxyapatite). This composite structure provides both the mechanical strength needed to prevent host tissue melting and the biocompatibility required to prevent intraocular infections, resolving the contradiction between these two critical properties.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the artificial cornea material by adjusting the crosslinking density, molecular weight, and compositional ratios of the polymer matrix and inorganic fillers. These parameter changes enable the material to simultaneously achieve enhanced mechanical strength for structural integrity and improved biocompatibility for safe integration with host tissue, eliminating the trade-off between these properties.
2Adaptability or versatility
If conventional artificial cornea materials are used, then the device can be implanted, but poor bio-integration and lack of epithelialization occur leading to complications
Solution Approach 1:
The patent introduces surface modifications with specific local properties, such as hydrophilic coatings, RGD peptide grafts, or endothelial cell layer coatings on specific regions of the artificial cornea. These localized quality enhancements promote epithelialization at the tissue interface while maintaining the overall structural integrity and optical properties of the implant, resolving the contradiction between bio-integration and epithelialization.
Solution Approach 2:
The patent employs intermediary substances such as growth factors (e.g., EGF, bFGF), extracellular matrix components (e.g., fibronectin, laminin), or bioactive glass particles that mediate between the artificial cornea material and host tissue. These intermediaries facilitate epithelialization and bio-integration by providing biochemical signals and adhesion sites, enabling reliable tissue integration without compromising the implant's structural function.
3Reliability
If the ocular device promotes tissue growth and epithelialization, then biocompatibility improves, but the complexity of the material structure increases
Solution Approach 1:
The patent divides the artificial cornea into functionally segmented layers: an optical zone for light transmission, a structural zone for mechanical support, and a bioactive zone for tissue integration and epithelialization. Each layer has optimized composition and thickness, allowing the device to promote biocompatibility through targeted tissue interaction while maintaining manageable overall structural complexity through modular design.
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 silica-collagen composite material provides a strong, transparent, and biocompatible ocular device that promotes epithelialization and integration with the host tissue, reducing complications and improving the efficacy of corneal implants and contact lenses.
Implementation Method 1
A silica-based composite material incorporating fibrillar proteins like collagen, which forms a hybrid matrix
Implementation Method 2
incorporating fibrillar proteins like collagen, which forms a hybrid matrix
Implementation Method 3
enhances mechanical strength, optical transparency
Implementation Method 4
allowing for tissue and cell growth, promotes epithelialization and integration with the host tissue
Data Source
AI summary
Disclosed herein are synthetic silica-based ocular devices fabricated from a composite material comprising silica and a fibrillar protein, together with methods of making and using the ocular devices.