Anisotropic Pore Multi-Layered Material via Concentric Thermal Gradient
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Solution Overview
Problem
Current medical materials for implants and tissue repair lack the ability to replicate the natural environment of cells effectively, leading to limited cell integration and functionality, particularly in multi-layered tissues like cartilage and bone, due to their isotropic pore structures and single-component compositions.
Innovation Solution
A multi-layered material production process using a temperature gradient to create anisotropic pores, allowing for the formation of a monolithic structure with layers of varying composition and functionality, mimicking the natural extracellular matrix by aligning and solidifying substances with sublimable compounds to form continuous, anisotropic pore structures that promote cell migration and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional freezing processes with parallel temperature-controllable surfaces are used, then a homogeneous distribution of fibres is achieved, but the pore structure becomes isotropic which limits cell migration and integration
Solution Approach 1:
The patent applies asymmetry by transitioning from parallel temperature-controllable surfaces to concentrically arranged temperature-controllable surfaces. This geometric change creates anisotropic pore structures with directional alignment that mimics natural extracellular matrix, thereby improving cell migration capability while maintaining homogeneous fibre distribution through the concentric thermal gradient.
Solution Approach 2:
The invention introduces a radial dimension by using concentrically arranged temperature-controllable surfaces instead of parallel planes. This dimensional change from 2D parallel surfaces to 3D concentric surfaces enables the formation of anisotropic pores with directional orientation, enhancing adaptability for cell migration while preserving composition homogeneity.
2Device complexity
If single-component materials like pure collagen type I are used, then material simplicity is maintained, but the ability to reproduce the natural environment of cells is limited
Solution Approach 1:
The patent employs composite materials by combining multiple collagen types (collagen type I and collagen type II) in different layers. This composite approach reproduces the complexity of natural extracellular matrix environments, significantly improving cell integration functionality and reliability while maintaining controlled material composition through the layering strategy.
Solution Approach 2:
The invention applies local quality by creating multi-layered structures where different collagen compositions are assigned to specific layers. Each layer can be optimized for particular functions (e.g., collagen type I for structural support, collagen type II for cartilage-like environment), thereby enhancing overall cell integration functionality while maintaining systematic material organization.
3Adaptability or versatility
If multi-layered structures are assembled from individual scaffolds, then functional zoning is achieved, but delamination occurs during rehydration
Solution Approach 1:
The patent merges multiple layers into a monolithic structure by using concentrically arranged temperature-controllable surfaces during the freezing process. This simultaneous formation approach creates inherent bonding between layers, preventing delamination during rehydration while maintaining functional zoning through different collagen compositions in different radial positions.
Solution Approach 2:
The invention uses the concentric thermal gradient field as an intermediary to bond layers together during freezing. This thermal mediator creates a monolithic structure where layers are inherently integrated through the freezing process itself, eliminating the need for separate bonding steps and preventing subsequent delamination.
4Quantity of substance
If freeze-drying is performed after solidification, then porous structure is created, but the pore alignment becomes random reducing anisotropy
Solution Approach 1:
The patent applies preliminary action by pre-aligning the pore-forming ice crystals during the freezing process using concentric temperature-controllable surfaces. This preliminary alignment is preserved through subsequent freeze-drying, maintaining anisotropic pore structures with directional precision while achieving adequate pore volume for cell migration.
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 resulting material exhibits enhanced stability, cell migration, and integration into native tissue, effectively replicating the natural environment of cells, thereby improving the reconstruction and functionality of cartilage and bone tissues.
Implementation Method 1
subliming the compound and consolidating the layers
Data Source
AI summary
The present invention relates to a process for the production of a multi-layered material having anisotropic pores. It further relates to a multi-layered material which can be produced by the process according to the invention, and to the use of a multi-layered material as a chondral support matrix, a meniscus support matrix or an intervertebral disc support matrix.