Hollow Microfiber Core-Shell Structure for Continuous Luminal Formation
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Solution Overview
Problem
Existing methods for forming microfibers with vascular endothelial cells and extracellular matrix components struggle to create continuous luminal structures of constant length, making it difficult to replicate blood vessels or lymph ducts effectively.
Innovation Solution
A hollow microfiber with a cell-adhesive layer and a high-strength outer shell layer is created using a coaxial microfluidic device, where a cell suspension is passed through to form a continuous cell layer within the microfiber, utilizing hydrogels like chitosan, collagen, or alginate, and agarose to achieve a stable and functional luminal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vascular endothelial cells and extracellular matrix component are introduced into the core portion of a microfiber and cultured, then cell function is maintained and three-dimensional cellular tissue can be constructed, but the cell layer forms randomly and it is difficult to form a continuous luminal structure having a constant length
Solution Approach 1:
The microfiber is divided into distinct functional layers: a core portion containing the extracellular matrix component and vascular endothelial cells, and an outer shell portion containing alginate gel. This segmentation allows the cell layer to form continuously along the microfiber axis while maintaining structural integrity and luminal structure consistency.
Solution Approach 2:
The microfiber is prepared with a pre-formed core-shell structure before cell introduction and culture. The outer shell portion is pre-formed to provide structural support and guide the formation of the continuous luminal structure, enabling constant length and proper orientation of the luminal structure.
2Strength
If a microfiber has sufficient mechanical strength for handling, then it can maintain structural integrity, but it is difficult to form a continuous luminal structure with constant length
Solution Approach 1:
The microfiber combines different material properties in its core-shell structure: the core portion uses extracellular matrix components (collagen or fibrin) for cell compatibility and luminal structure formation, while the outer shell uses alginate gel for mechanical strength and structural stability. This composite structure simultaneously provides handling strength and precise luminal structure formation.
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 microfiber can transport liquids and form continuous luminal structures, serving as a viable alternative for blood vessels or lymph ducts, with enhanced mechanical strength and biocompatibility, reducing the risk of thrombus formation and facilitating integration with biological tissues.
Implementation Method 1
a cell-adhesive layer containing a cell-adhesive hydrogel, and an outer shell layer containing a high-strength hydrogel
Data Source
AI summary
The present invention relates to a hollow microfiber comprising (1) one or more cell-adhesive layers having a cell-adhesive hydrogel, (2) an outer shell layer having a high-strength hydrogel that covers the outer periphery of the cell-adhesive layer that is positioned farthest from the center axis among the one or more cell-adhesive layers, and (3) a cell layer that covers the inner periphery of the cell-adhesive layer that is positioned closest to the center axis among the one or more cell-adhesive layers. The present invention also relates to a method of manufacturing the hollow microfiber and a kit for carrying out the manufacturing method.