Variable Density Tissue Graft for High-Force Sites
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Solution Overview
Problem
Existing tissue graft compositions made from extracellular matrices (ECMs) are not strong enough to withstand forces and pressures at anatomical sites like the abdominal wall and joints, leading to rapid bioresorption and failure before complete tissue restoration can occur.
Innovation Solution
A tissue graft composition with multiple layers, including a dense aponeurosis layer and an epithelial basement membrane layer, where one layer has a density significantly higher than the other, providing strength and elasticity to withstand forces and pressures, and allowing for prolonged bioresorption to facilitate complete tissue restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ECM layers are used for tissue restoration, then epithelial tissue restoration is achieved rapidly, but connective tissue restoration is prolonged and the composition lacks sufficient strength to withstand forces and pressures
Solution Approach 1:
The patent combines multiple ECM layers with different densities and mechanical properties to create a composite tissue graft composition. The first ECM layer provides epithelial restoration while the second, denser ECM layer provides structural strength and durability, allowing the composition to withstand forces and pressures at anatomical sites like the abdominal wall and joints.
Solution Approach 2:
The patent creates layers with different local properties - the first ECM layer has properties optimized for epithelial cell migration and regeneration, while the second ECM layer has higher density and strength properties optimized for mechanical support. Each layer is positioned at the appropriate location to fulfill its specific function.
2Speed
If ECM compositions are used for tissue restoration, then epithelial restoration occurs rapidly, but complete tissue restoration is prolonged due to slower connective tissue restoration
Solution Approach 1:
The multi-layer ECM composition allows simultaneous optimization for different restoration processes - the first layer accelerates epithelial restoration while the second layer supports prolonged connective tissue restoration, enabling both processes to occur in parallel rather than sequentially.
3Ease of manufacture
If single-layer ECM compositions are used, then manufacturing is simple, but the composition lacks sufficient durability to persist at implantation sites subjected to high forces and pressures
Solution Approach 1:
The patent creates a multi-layer composite structure where each layer contributes specific properties. The combination of layers with different densities and mechanical characteristics provides the durability needed to withstand forces and pressures at anatomical sites, while maintaining a relatively straightforward manufacturing process involving layering and joining techniques.
Solution Approach 2:
The tissue graft composition is divided into distinct functional layers - a first ECM layer for epithelial restoration and a second, denser ECM layer for structural support. This segmentation allows each layer to be optimized for its specific function while working together as an integrated composition.
4Strength
If ECM layers are layered and mechanically compressed or vacuum compressed to join them, then strength is added to the composition, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs layering and joining techniques such as mechanical compression or vacuum compression to create a multi-layer composite structure. These processes, while adding complexity to manufacturing, are necessary to achieve the sufficient strength and durability required for the composition to persist at implantation sites subjected to high forces and pressures.
Data Source
AI summary
Disclosed are tissue graft compositions made of materials having different densities, methods of making, and methods of treatment for restoring tissues in a patient.