Electrostretched Hydrogel Microfibers for Vascular Tissue Engineering
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Solution Overview
Problem
Current methods for creating functional microvascular structures in vitro lack control over topographical cues and fail to recapitulate the cellular and ECM protein organization found in native vasculature, limiting the study of microvasculature development and regeneration.
Innovation Solution
The development of electrostretched polymer microfibers with uniaxial alignment, made from polymers like alginate, fibrin, or gelatin, which guide endothelial cell alignment and ECM deposition, allowing for the sequential co-culture of endothelial and perivascular cells and the creation of a multicellular microvascular structure with organized endothelium and tunica media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional hydrogel matrices with isotropic structure are used, then high water content and biochemical versatility are achieved, but control over cellular organization and topographical cues is limited
Solution Approach 1:
The patent applies asymmetry by transforming the isotropic hydrogel structure into an anisotropic one through electro-mechanical stretching. This stretching process creates aligned nanofiber structures within the hydrogel matrix, introducing directional asymmetry that provides topographical cues for cell alignment and organization while preserving the hydrogel's high water content and biochemical properties
Solution Approach 2:
The patent changes the structural parameters of the hydrogel by applying electrical fields and mechanical stretching forces. This transforms the random nanofiber arrangement into an aligned configuration, creating controlled topographical features that guide cellular organization without altering the fundamental hydrogel composition or water content
2Adaptability or versatility
If electrospun nanofibers are dispersed into hydrogel matrix, then cellular alignment is promoted, but controlling alignment of the nanofibers inside hydrogel matrix is challenging
Solution Approach 1:
The patent applies preliminary action by aligning the nanofibers through electro-mechanical stretching before cells are introduced to the matrix. This pre-alignment process creates the desired topographical cues in advance, ensuring that when cells are added, they immediately encounter the aligned structure that guides their organization and alignment
Solution Approach 2:
The patent replaces conventional mechanical dispersion methods with an electro-mechanical stretching approach. By applying electrical fields combined with mechanical stretching, the patent achieves precise control over nanofiber alignment that cannot be obtained through traditional mechanical mixing or dispersion techniques alone
3Adaptability or versatility
If microfluidic-based alginate hydrogel microfibers with surface alignment are used, then guided neurite outgrowth is achieved, but alignment cue is only confined to the surface
Solution Approach 1:
The patent utilizes the porous nanofiber structure of the hydrogel matrix and applies electro-mechanical stretching to align these nanofibers throughout the entire bulk volume. This creates alignment cues that extend from the surface into the interior of the matrix, allowing cells throughout the three-dimensional structure to receive directional guidance, not just those on the surface
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
This approach enables the formation of microvascular structures with controlled topographical cues, enhanced ECM deposition, and improved cellular alignment, facilitating the study of microvasculature development and regeneration by mimicking the organization of native vasculature.
Implementation Method 1
applying an electrical potential to the at least one starting solution sufficient to initiate a jet stream of polymer solution
Implementation Method 2
The high voltage electrode is contacted with a starting solution to initiate a jet stream of polymer solution through, for example, a syringe needle. The jet stream of polymer solution is collected with a rotating collection plate positioned at a close distance to the tip of the syringe needle before the jet stream of polymer solution is accelerated into a whipping jet by an electrical field induced by the high voltage electrode.
Implementation Method 3
The presently disclosed methods use an electrical field to initiate and stretch a jet stream of polymer solution and a mechanical force exerted by a rotating collection plate comprising a stabilizing collection solution and a rotating collection plate to control the amount of stretching.
Implementation Method 4
The jet stream of polymer solution is collected with a rotating collection plate positioned at a close distance to the tip of the syringe needle
Data Source
AI summary
The presently disclosed subject matter provides a scalable and electrostretching approach for generating hydrogel microfibers exhibiting uniaxial alignment from aqueous polymer solutions. Such hydrogel microfibers can be generated from a variety of water-soluble natural polymers or synthetic polymers. The hydrogel microfibers can be used for controlled release of bioactive agents. The internal uniaxial alignment exhibited by the presently disclosed hydrogel fibers provides improved mechanical properties to hydrogel microfibers, and contact guidance cues and induces alignment for cells seeded on or within the hydrogel microfibers.