Microfluidic Chip Enlarged Channels for 3D Bioprinting
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Solution Overview
Problem
Current microfluidic technologies for preparing cell-loaded microspheres in 3D bioprinting face challenges in achieving high cell activity and efficient droplet production due to shear force damage and low yield, particularly when dealing with high-viscosity materials.
Innovation Solution
A microfluidic chip design with enlarged flow channels and controlled flow velocities to reduce shear force on cells while maintaining sufficient shear force for droplet formation, using a cross or flow sandwiching focusing channel structure to ensure cell activity and increase droplet yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microfluidic technology with flow channels of 100 μm is used to prepare droplets, then droplet generation is achieved, but cell activity is reduced due to shear force damage
Solution Approach 1:
The patent changes the key parameter of flow channel cross-sectional area from conventional small sizes (100 μm scale) to enlarged sizes (0.1-1 mm2). This parameter change reduces flow velocity and shear force on cells while maintaining droplet generation capability through optimized geometric parameters
Solution Approach 2:
The patent transitions from conventional micro-scale (1D/2D) flow channels to enlarged cross-sectional dimensions (0.1-1 mm2), effectively moving to a different dimensional scale that allows simultaneous achievement of gentle cell handling and efficient droplet production through multi-dimensional optimization of channel geometry
2Object-affected harmful factors
If passive microfluidic method is used to avoid adverse effects on cells, then cell activity is improved, but droplet production efficiency is reduced
Solution Approach 1:
The patent optimizes geometric parameters (enlarged cross-sectional area of 0.1-1 mm2, specific length-to-width ratios) to enhance passive flow dynamics, creating sufficient velocity gradients and shear forces for efficient droplet generation while maintaining low enough overall shear stress to preserve cell activity
Solution Approach 2:
The patent creates dynamic flow conditions within the enlarged passive channels, where controlled velocity gradients and flow patterns generate the necessary shear forces for droplet formation without requiring active external fields, thus achieving both high efficiency and cell viability through dynamic flow optimization
3Object-affected harmful factors
If flow channel size is increased to reduce shear force on cells, then cell activity is maintained, but droplet generation efficiency is reduced
Solution Approach 1:
The patent simultaneously optimizes multiple geometric parameters including cross-sectional area (0.1-1 mm2), channel length, width, and aspect ratios to create a balanced flow regime that provides gentle cell handling while maintaining sufficient flow velocity and shear for efficient droplet generation
Solution Approach 2:
The patent creates a composite flow regime within the enlarged channels, combining regions of low shear stress for cell protection with localized high shear regions for droplet generation, achieving both objectives through spatially varying flow conditions in a single passive device
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 design enhances droplet generation efficiency and maintains high cell activity, improving the yield of microspheres for 3D bioprinting by optimizing flow channel sizes and flow rates, meeting the requirements for 3D biological printing.
Implementation Method 1
the shearing phase fluid can flow in from the second flow channel so as to separate the sheared phase fluid into discrete droplets in the intersection area
Data Source
AI summary
The present disclosure relates to a microfluidic chip and a control method thereof, a droplet generation device and a microsphere preparation device. The microfluidic chip includes a matrix (3), and a first flow channel (1) and a second flow channel (2) provided in the matrix (3), wherein the first flow channel (1) and the second flow channel (2) intersect to form an intersection area, sheared phase fluid can flow in from the first flow channel (1), shearing phase fluid can flow in from the second flow channel (2) so as to separate the sheared phase fluid into discrete droplets in the intersection area, and the cross-sectional areas of the first flow channel (1) and the second flow channel (2) range from 0.1 mm2 to 1 mm2. The microfluidic chip can increase the flow rate and improve the efficiency of forming droplets; and the efficiency of generating the droplets is increased on the basis of ensuring the cell activity in order to meet the requirements of 3D biological printing.