Electrospun Scaffolds with Sacrificial Template for Microvascular Channels
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Solution Overview
Problem
Current methods for creating artificial microvascular networks for tissue engineering, such as lithography and cell/gel printing, face limitations including thick solid layers that hinder diffusion and mechanical weakness, making them unsuitable for in vivo use, and electrospun scaffolds struggle with vascularization due to tight fiber packing.
Innovation Solution
The method combines electrospinning with a sacrificial template using additive manufacturing to produce biodegradable, porous fibrous microvascular scaffolds, where a polymer like PVA is used as a template that is dissolved, creating channels within the scaffold, allowing for vascular networks and multi-layered constructs with various cell types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lithography is used to fabricate microvascular networks, then vascular structures can be created, but thick solid layers separate vasculature from parenchyma limiting diffusion
Solution Approach 1:
The patent uses electrospun fibrous scaffolds with inherent porosity to replace traditional lithographic solid layers. The fibrous structure creates interconnected pores that allow diffusion of nutrients and waste between vasculature and parenchyma while maintaining structural integrity of the microvascular network
Solution Approach 2:
The patent combines multiple materials including electrospun polymers (PCL, PLGA), sacrificial template materials (PVA, gelatin), and biological components to create a composite scaffold that simultaneously provides mechanical support, porosity for diffusion, and vascular network structure
2Manufacturing precision
If cell/gel printing techniques are used, then vascular networks can be constructed, but the structures remain mechanically weak
Solution Approach 1:
The patent merges cell/gel printing technology with electrospinning by using electrospun fibrous scaffolds as a mechanical framework that provides strength while maintaining porosity. The sacrificial template is embedded within this strong fibrous matrix, and upon removal creates vascular channels supported by the mechanically robust electrospun scaffold
Solution Approach 2:
The patent applies different material properties to different regions: the electrospun fibrous scaffold provides mechanical strength in the bulk, while the sacrificial template regions provide defined vascular channel locations, and the resulting porous structure provides diffusion pathways
3Shape
If electrospun scaffolds are used to mimic extracellular matrix, then fibrous structure is achieved, but tight fiber packing limits cell infiltration
Solution Approach 1:
The patent performs preliminary action by embedding the sacrificial template within the electrospun scaffold before completing the electrospinning process. This ensures the template is positioned correctly within the fibrous matrix, and subsequent template removal creates pre-formed channels that facilitate cell infiltration without requiring post-processing modification of the fibrous structure
Solution Approach 2:
The patent transforms the typically dense electrospun fibrous structure into a porous architecture by using the sacrificial template method. The template occupies space within the fibrous matrix, and its removal creates interconnected pores and channels that maintain the beneficial fibrous structure while enabling cell infiltration and vascular network 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
This approach enables the creation of fibrous constructs with integrated vascular networks that facilitate cell infiltration and diffusion, providing a biodegradable and suturable scaffold suitable for in vivo applications, overcoming the limitations of existing methods by mimicking the extracellular matrix and allowing for efficient tissue engineering.
Implementation Method 1
The sacrificial template is removed, such as by dissolving in water, producing microstructures in the electrospun construct
Implementation Method 2
electrospinning a second layer of fibrous biomaterial onto the micropatterned sacrificial template thereby encapsulating the template
Data Source
AI summary
Methods are disclosed which combine electrospinning and a sacrificial template, such as with additive manufacturing (AM), to produce fibrous microvascular scaffolds which are biodegradable, porous, and easily handled. In one example, a process for fabricating a fibrous network construct is disclosed. The method includes electrospinning a first layer of fibrous material; printing a micropatterned sacrificial template; transferring the micropatterned sacrificial template onto the electrospun fibers; electrospinning a second layer of fibrous biomaterial onto the micropatterned sacrificial template thereby encapsulating the template and generating a construct with two layers; and removing the sacrificial template, producing a fibrous construct with channels or microstructures formed therein. Also disclosed are fibrous constructs and scaffolds produced by the provided methods.