Cell-Seeded Substrate for Ocular Tissue Implantation
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Solution Overview
Problem
Current methods for cellular therapy face challenges in effectively delivering and retaining stem cells at target tissues, particularly in ocular tissues, due to low retention rates and limited long-term persistence, which affects the treatment of diseases like age-related macular degeneration.
Innovation Solution
A substrate system comprising a handpiece with forceps and a movement control mechanism for implanting cell-seeded substrates into ocular tissues, featuring a non-porous polymer with a roughened apical surface and supporting features, designed to retain cells and facilitate their interaction with photoreceptors, and a method for surgically positioning these substrates juxtaposed to the outer nuclear layer of photoreceptors in the eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stem cells are delivered to target tissues using current cellular therapy methods, then cell transplantation is achieved, but cell retention rate is low and long-term persistence is limited
Solution Approach 1:
A biocompatible substrate is introduced as an intermediary carrier between the stem cells and the target ocular tissue. The substrate provides structural support and a favorable microenvironment that enhances cell retention and survival. The substrate acts as a temporary scaffold that facilitates cell integration while maintaining cell viability over extended periods, directly addressing the low retention and persistence issues
Solution Approach 2:
The substrate's physical and chemical parameters are optimized to enhance cell retention. The porous structure with controlled pore size (0.1-10 micrometers) is designed to physically retain cells while allowing nutrient and waste exchange. The substrate's mechanical properties, surface chemistry, and degradation rate are tuned to match the target tissue environment, thereby improving both retention rate and long-term cell persistence
2Reliability
If a substrate system is introduced to improve cell retention, then cell viability is enhanced, but device complexity increases
Solution Approach 1:
The substrate utilizes a porous structure made from biocompatible materials such as collagen, gelatin, or synthetic polymers. The porous architecture provides mechanical support while allowing diffusion of nutrients, oxygen, and metabolic waste. This single-material porous approach enhances cell viability without requiring complex multi-component systems, as the porosity itself fulfills multiple functions including structural support, mass transport, and cell anchoring
Solution Approach 2:
The substrate employs controlled parameter changes in its physical and chemical properties to simplify the overall system. By adjusting pore size, porosity percentage, degradation time, and surface chemistry in a controlled manner, the substrate achieves enhanced cell viability through a single integrated structure rather than multiple separate components, thereby managing device complexity
3Reliability
If the substrate structure is optimized for cell retention, then cell interaction with photoreceptors is improved, but manufacturing precision requirements increase
Solution Approach 1:
The porous substrate structure is designed with pore sizes ranging from 0.1 to 10 micrometers, which is sufficient to physically retain stem cells while allowing small molecules like nutrients and waste products to diffuse freely. This pore size range achieves effective cell-photoreceptor interaction without requiring sub-micrometer precision manufacturing, as the functional requirements are met within this broader tolerance range
Solution Approach 2:
The substrate exhibits local quality variations with different regions having distinct properties. The surface layer has optimized porosity and surface chemistry for cell attachment and interaction, while the bulk structure provides mechanical support. This spatial differentiation of properties allows the substrate to achieve high cell interaction efficiency in the critical interface region without requiring the entire structure to meet stringent precision requirements
Data Source
AI summary
Disclosed herein are instruments and methods for delivery of substrates, including cell-seeded substrates, to target tissues requiring treatment for various diseases that induce cell death, damage or loss of function. The substrates are configured to provide cells, including stem cells, with a structural support that allows interconnection with and transmission of biological signals between the cells and the target tissue.