Trilayered Nanofibrous Heart Valve Leaflets via Electrospinning
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Solution Overview
Problem
Current methods for producing biologic heart valve leaflets fail to accurately replicate the native tissue structure and mechanical properties, leading to issues such as valvular regurgitation and stenosis due to adverse biochemical and mechanical stresses on valvular interstitial cells (VICs).
Innovation Solution
The development of a synthetic trilayered nanofibrous substrate using electrospinning techniques to create layers mimicking the native heart valve leaflet structure, comprising circumferentially, randomly, and radially oriented nanofibers, which are cultured with VICs in the presence of ascorbic acid to produce collagen and other extracellular matrix components, thereby replicating the native tissue's mechanical and structural properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current methods are used to produce biologic heart valve leaflets, then production is simpler, but the native tissue structure and mechanical properties are not accurately replicated
Solution Approach 1:
The production method segments the complex task of replicating native tissue by creating three distinct nanofibrous layers (fibrosa, spongiosa, ventricularis) with specific collagen orientations, each deposited sequentially using electrospinning. This segmentation allows precise control over the structural complexity of each layer while maintaining overall manufacturing feasibility
Solution Approach 2:
The invention changes physical parameters during electrospinning deposition, including fiber orientation angles (circumferential, random, radial), fiber diameter distribution, and layer thickness, to accurately replicate native tissue architecture. These parameter variations enable high manufacturing precision without requiring overly complex production systems
2Reliability
If VICs are subjected to adverse biochemical and mechanical stresses, then valve dysfunction occurs, but avoiding these stresses requires complex protective measures
Solution Approach 1:
The patent applies beforehand cushioning by pre-establishing a biomimetic extracellular matrix environment through the trilayered nanofibrous structure before VICs are subjected to mechanical stresses. The collagen-oriented framework provides structural support and biochemical cues that protect VICs from adverse stresses, preventing valve dysfunction without requiring additional complex protective interventions during operation
Solution Approach 2:
The invention copies the native valve tissue architecture and biochemical environment at the nanoscale through electrospun collagen fibers with specific orientations. This copying creates a faithful replica of the natural extracellular matrix that naturally protects VICs from adverse stresses, eliminating the need for artificial protective measures
3Manufacturing precision
If a single-layer substrate is used, then manufacturing is simpler, but the native trilayered structure cannot be replicated
Solution Approach 1:
The substrate is segmented into three distinct nanofibrous layers (fibrosa, spongiosa, ventricularis) with characteristic collagen orientations, deposited sequentially through electrospinning. This segmentation achieves high structural fidelity to native trilayered tissue while maintaining manufacturing simplicity through a systematic layer-by-layer approach
Solution Approach 2:
Each subsequent layer is deposited preliminarily prepared on top of the previous layer, with the electrospinning parameters pre-configured for the desired fiber orientation. This preliminary action approach builds the complex trilayered structure systematically, making manufacturing easier despite the increased structural fidelity requirements
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 biologic heart valve leaflets exhibit elastomeric properties and stress-strain profiles similar to native leaflets, with VICs demonstrating phenotypes and gene expressions comparable to those in native tissues, providing a biomimicked heart valve that can serve as a substitute for studying heart valve diseases and potentially for in vivo applications.
Implementation Method 1
The substrates can be prepared by an electrospinning process
Implementation Method 2
VICs seeded on the substrates can produce collagen and other proteins to form a tissue construct
Data Source
AI summary
Systems and methods for producing biologic tissues are described. For example, this document provides electrospinning systems and culturing techniques to make biologic heart valve leaflets and fibrosa layers of native valve leaflet having nanofibrous substrate layer(s). In some implementations, a tri-layered leaflet with circumferentially, randomly, and radially oriented nanofibers that mimics morphologies of native leaflets.