3D Printed Scaffolds with Electrospun Nanofiber Coatings
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Solution Overview
Problem
Current methods for fabricating scaffolds for tissue regeneration, such as 3D printing, lack biomimetic surface nanotopography and limited biomolecule presenting capacity, which hinders effective cell adhesion and proliferation, especially for critical-sized tissue defects.
Innovation Solution
A method involving surface modification of 3D printed scaffolds with electrospun nanofiber segments, specifically bioactive glass and PLGA-collagen-gelatin nanofibers, combined with plasma treatment and crosslinking, to create a biomimetic nanofibrous structure that enhances cell adhesion and proliferation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If 3D printing is used to fabricate scaffolds, then manufacturing precision and structural control are improved, but surface nanotopography and biomolecule presenting capacity deteriorate
Solution Approach 1:
The patent combines 3D printing technology with electrospinning technology to create hybrid scaffolds. The 3D printed scaffold provides the macroscopic structure with controlled pore size, while the electrospun nanofiber coating provides the biomimetic surface nanotopography. This merging of two fabrication techniques allows both manufacturing precision and surface quality to be achieved simultaneously.
Solution Approach 2:
The 3D printed scaffold is first fabricated with precise pore size control, then subsequently coated with electrospun nanofibers to add surface nanotopography. This sequential approach where the base structure is prepared first and then enhanced with surface modification allows each technique to optimize its contribution without interfering with the other.
2Ease of manufacture
If conventional scaffold fabrication methods are used, then ease of manufacture is improved, but pore size precision and interconnectivity deteriorate
Solution Approach 1:
The patent merges conventional electrospinning (easy to manufacture) with 3D printing (precise pore control) to create a composite scaffold system. The electrospun nanofibers are applied as a coating on the 3D printed scaffold, combining the ease of nanofiber fabrication with the precision of 3D printed architecture.
3Reliability
If scaffold surface is modified with nanofibers, then cell adhesion and proliferation are improved, but device complexity increases
Solution Approach 1:
The patent utilizes the porous structure of electrospun nanofibers to create a biomimetic extracellular matrix environment on the scaffold surface. The nanofibrous porous structure naturally promotes cell adhesion and proliferation by mimicking natural tissue architecture, achieving improved reliability through material structure rather than complex surface chemistry modifications.
Solution Approach 2:
The patent creates a composite material system where electrospun nanofibers (containing biomolecules like gelatin, collagen, or chitosan) are combined with the 3D printed scaffold material. This composite approach enhances cell adhesion through the nanofiber's inherent biomimetic properties and embedded biomolecules, reducing the need for additional complex surface modification steps.
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 modified scaffolds promote significant adhesion and proliferation of pre-osteoblasts and bone marrow mesenchymal stem cells, and immobilization of BMP-2 mimicking peptides enhances osteogenic differentiation, improving the efficacy of scaffolds for tissue engineering.
Implementation Method 1
The method may further comprise plasma treating the scaffold prior to coating the surface of the scaffold
Implementation Method 2
In certain embodiments, the nanofiber segments are electrospun nanofiber segments
Implementation Method 3
the crosslinking comprises contacting the coated scaffold with a chemical crosslinker such as glutaraldehyde
Data Source
AI summary
Surface modified scaffolds are provided as well as methods of use thereof and methods of making.