Electrospinning Nanofiber Coating on Poorly Conductive 3D Scaffolds
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Solution Overview
Problem
Current methods for applying electrospun nanofibers to three-dimensional objects, particularly those made of poorly conductive materials like PCL/PLLA, are inefficient, resulting in incomplete coverage and lack of direct contact between the nanofibers and the scaffold, which hinders tissue engineering applications requiring complex three-dimensional structures.
Innovation Solution
A method and apparatus that uses an electrically conductive needle to establish a direct connection between the poorly conductive scaffold and a grounded collector, allowing for efficient deposition of nanofibers over the entire surface of the object, including top, bottom, and side surfaces, by attracting charged nanofibers through the conductive needle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flat grounded collector is used for electrospinning, then the setup is simple, but nanofibers cannot be deposited on all surfaces of three-dimensional objects
Solution Approach 1:
The patent transitions from a two-dimensional flat collector to a three-dimensional configuration by inserting conductive needles through the scaffold. This allows nanofibers to be deposited on all surfaces (top, bottom, and sides) of three-dimensional objects, achieving complete surface coverage that was impossible with a flat collector.
Solution Approach 2:
The grounded collector is segmented into multiple conductive needles distributed throughout the scaffold. Each needle acts as an independent charge delivery point, enabling localized nanofiber deposition on different surfaces of the three-dimensional object simultaneously.
2Adaptability or versatility
If electrospinning is applied to poorly conductive materials, then the method can be used for various polymers, but charge distribution is insufficient for efficient nanofiber deposition
Solution Approach 1:
Conductive needles serve as intermediary elements inserted into poorly conductive polymer scaffolds. These needles act as charge distribution mediators, delivering electrical charge from the external power source to the polymer matrix, thereby enabling efficient electrospinning on materials that would otherwise be difficult to process.
3Ease of operation
If nanofibers are deposited on three-dimensional objects without direct contact, then the process is simpler, but the nanofibers do not adhere properly after sterilization
Solution Approach 1:
The conductive needles are inserted through the scaffold from one surface to the opposite surface, creating a three-dimensional charge distribution network. This ensures that nanofibers are deposited directly onto all surfaces of the scaffold, including areas that would be difficult to reach, thereby achieving complete and reliable coating adhesion even after sterilization.
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 ensures uniform and stable nanofiber coating that remains adhered to the scaffold even after sterilization, expanding the applicability of electrospinning to more complex tissue engineering and biomedical applications by providing a robust three-dimensional nanofiber structure.
Implementation Method 1
A method and apparatus that uses an electrically conductive needle to establish a direct connection between the poorly conductive scaffold and a grounded collector, allowing for efficient deposition of nanofibers over the entire surface of the object, including top, bottom, and side surfaces, by attracting charged nanofibers through the conductive needle.
Implementation Method 2
applying a high voltage power to the spinneret thereby generating electrospun polymer fibers of said spinnable polymer fluid that are attracted to said three-dimensional object
Data Source
AI summary
The present invention is directed to a novel method and apparatus for facilitating and improving efficient application of nanofibers to the surface of poorly conductive three-dimensional objects using electrospinning. The apparatus and associated methods of the present invention provide a much more direct connection between the object and the grounded plate collector while allowing the object to be supported above the collector in a manner which promotes nanofiber deposition over the top, bottom and side surfaces of the object, closely covering all of its surfaces with nanofibers. Moreover, the deposition of electrospun nanofibers according to various embodiments of the present invention expands electrospinning technology to greater numbers of applications in which three-dimensional coatings of a wide nature are advantageous.