Microfluidic Bioprinting with Peptide Bioink and Buffer Gelation
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Solution Overview
Problem
Current 3D bioprinting technologies face challenges with reproducibility and sustainability due to batch-to-batch variations in natural materials, and existing methods require chemical initiators or photo-polymerization, which may not provide optimal conditions for cell function and structural integrity.
Innovation Solution
A device and method using a peptide bioink solution and a buffer solution for instantaneous gelation, combined with a microfluidic system and robotic arms for precise 3D printing, allowing for the creation of peptide hydrogels with controlled ratios and properties, enabling the printing of complex structures and incorporation of nanomaterials under physiological conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural materials are used for bioink, then biocompatibility is improved, but batch-to-batch variations worsen reproducibility
Solution Approach 1:
The patent changes the material composition parameter from natural materials to synthetic peptide-based bioinks. This substitution eliminates batch-to-batch variations inherent in natural materials while maintaining biocompatibility, as the synthetic peptides can be precisely controlled and reproduced across different batches.
Solution Approach 2:
The patent uses composite materials by combining synthetic peptides with natural extracellular matrix components. This creates a bioink that retains the biocompatibility of natural materials while achieving the consistency and reproducibility of synthetic materials through controlled peptide sequences and compositions.
2Speed
If chemical initiators or photo-polymerization are used, then gelation speed is improved, but cell function and structural integrity are compromised
Solution Approach 1:
The patent replaces chemical initiation mechanisms with a mechanical mixing approach. By using a multi-inlet nozzle system that mechanically combines bioink components upon contact, the system achieves rapid gelation without requiring chemical initiators or UV light exposure, thereby preserving cell function and structural integrity.
Solution Approach 2:
The patent introduces a buffer solution as an intermediary that triggers gelation through a benign chemical environment rather than aggressive initiators. The buffer creates optimal pH or ionic conditions that induce gentle gelation, protecting embedded cells from damage while achieving the required gelation speed.
3Shape
If complex 3D structures are printed, then structural complexity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the bioink delivery system into multiple independent inlets, each controlling a specific component. This segmentation allows precise control over the mixing ratios and flow rates of different bioink components, enabling the printing of complex 3D structures with high manufacturing precision through independent adjustment of each stream.
Solution Approach 2:
The patent employs a dynamic mixing system where the ratio of bioink components can be adjusted in real-time during printing. This dynamic control allows the system to adapt mixing parameters for different regions of the 3D structure, maintaining high precision even as structural complexity increases.
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 provides improved reproducibility, sustainability, and biocompatibility, enabling the creation of complex 3D structures with enhanced mechanical and chemical properties, suitable for tissue engineering and regenerative medicine, while avoiding immunological issues and allowing for precise control over cell placement and vascularization.
Implementation Method 1
a second inlet configured to take in a buffer solution capable of inducing gelation of the bioink solution, preferably instantaneous gelation of the bioink solution
Implementation Method 2
The peptide-based hydrogel is formed by mixing a peptide solution with a buffer solution, such as a phosphate buffer solution
Data Source
AI summary
The present invention relates to a device and a method for building a 3D object by mixing a bioink solution, a buffer solution capable of inducing gelation of the bioink solution and a dispersion containing micro and/or nanoparticles, and ejecting the formed hydrogel out of a nozzle. The present invention further relates to a method of obtaining a hydrogel.