Acellular Matrix Scaffold with Composite Fiber Coating for Tissue Regeneration
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Solution Overview
Problem
Current bioengineered materials for tissue engineering lack the ability to effectively mimic the in vivo microenvironment, limiting their ability to promote cell growth and tissue regeneration.
Innovation Solution
An acellular matrix coated with fibers comprising both biological and nonbiological materials is used to create a structured environment that stimulates cell attachment, growth, and differentiation, mimicking the in vivo mechanical environment and delivering regulatory molecules and therapeutic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acellular matrix grafts of collagen and elastin fiber are used, then antigenicity is reduced, but the ability to effectively mimic the in vivo microenvironment and promote cell growth is limited
Solution Approach 1:
The patent combines acellular matrix grafts with synthetic polymer fibers (such as polyethylene glycol, polypropylene, or polyester) to create a composite scaffold. This composite structure maintains the low antigenicity of the acellular matrix while adding the mechanical strength, porosity control, and surface properties of synthetic polymers that better mimic the in vivo microenvironment, thereby resolving the contradiction between biocompatibility and functional performance
Solution Approach 2:
The patent applies different materials with specific properties to different regions or aspects of the scaffold structure. The acellular matrix provides the biological compatibility and cell-adhesive properties in contact with cells, while synthetic polymer components provide structural support and controlled porosity in load-bearing regions, creating local optimization of properties that resolves the contradiction
2Productivity
If stem cells are added to the acellular matrix, then tissue regeneration is enabled, but control over cell growth direction and organization is insufficient
Solution Approach 1:
The patent incorporates three-dimensional microarchitectural features, aligned fiber orientations, and layered structures into the scaffold that provide spatial cues for stem cell differentiation and organization. These dimensional features guide cells to grow in specific directions and form organized tissue structures, transforming the uncontrolled 3D growth into directed development along desired anatomical pathways
Solution Approach 2:
The patent introduces intermediary elements such as growth factor-loaded microspheres, peptide-coated fiber surfaces, or biochemical gradient systems within the scaffold that mediate between the stem cells and the scaffold structure. These intermediaries provide localized biochemical signals that direct cell behavior, differentiation, and organization, enabling controlled tissue formation rather than random growth
3Ease of manufacture
If the scaffold structure is simplified, then manufacturing is easier, but the ability to control moisture and temperature for optimal cell growth is reduced
Solution Approach 1:
The patent modifies physical parameters of the scaffold such as porosity size distribution, fiber diameter, and thermal conductivity by adjusting manufacturing parameters (e.g., electrospinning voltage, collector distance, polymer concentration) rather than changing the basic fabrication process. This allows optimization of moisture retention and thermal properties while maintaining the simplicity of the electrospinning manufacturing method
Data Source
AI summary
A method for organizing and controlling cell growth on a cell-free structure comprises steps of decellularizing a biological material to produce an acellular matrix; adding cells sought to be propagated to the acellular matrix; coating the acellular matrix with a fiber comprising biological and nonbiological material; and storing the covered acellular matrix for a time sufficient to form organized cell growth in the three-dimensional structural shape. The method may include the step of covering the three-dimensional structural shape by a structural layer to enable generation of a replacement external organ. This structural layer comprises a polymer film and fiber with a biological material and a nonbiological material. The biological material includes a cell growth factor; and the nonbiological material includes magnetite. This structural layer also comprises a therapeutic at a concentration between 0.001 and 5 weight percent. This structural layer may also comprise an acellular matrix of an organ.