Continuous-Flow Microfluidics for Uniform Lipid Nanoparticle Production
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Solution Overview
Problem
Existing microfluidic systems face challenges in producing self-assembled substance particles, such as lipid nanoparticles, with high size uniformity and stability due to high pressure supply, leading to pulsation and potential chip damage.
Innovation Solution
A continuous flow microfluidic system with controlled pulsation rates and a specific flow path structure, including a mixing/diluting path with alternating structural elements, to stabilize the production of self-assembled particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sample is supplied at a high pressure to improve productivity, then the flow rate increases, but pulsation occurs and size uniformity deteriorates
Solution Approach 1:
The system divides the single high-pressure supply into multiple parallel microfluidic chips, each receiving a portion of the total flow. This segmentation allows high productivity through multiple channels while maintaining size uniformity in each individual chip by reducing the pressure and pulsation in each channel.
Solution Approach 2:
A pulsation damping element is installed in the fluid supply path before the sample reaches the microfluidic chip. This preliminary action dampens the pulsation caused by high-pressure supply, ensuring stable flow conditions and consistent particle size uniformity before the fluid enters the mixing region.
2Productivity
If a sample is supplied at a high pressure to improve productivity, then the flow rate increases, but the microfluidic chip may be damaged
Solution Approach 1:
The system uses multiple parallel microfluidic chips instead of a single chip handling the entire high-pressure flow. This distributes the mechanical stress across multiple components, preventing any single chip from experiencing damaging pressure levels while maintaining high overall productivity.
Solution Approach 2:
A pulsation damping element is installed upstream to reduce pressure fluctuations and stabilize the fluid supply before it reaches the microfluidic chip, preventing damage from high-pressure pulsation while allowing high average flow rates for productivity.
3Productivity
If multiple parallel microfluidic chips are used to increase productivity, then the production amount increases, but it is difficult to ensure equivalent characteristics of the manufactured particles
Solution Approach 1:
Each microfluidic chip is designed with identical flow path structures, channel dimensions, and mixing regions to ensure local quality consistency. This standardization guarantees that particles produced in each chip have equivalent characteristics, while the parallel configuration of multiple identical chips achieves high productivity.
4Stability of the object's composition
If the flow path length is increased to improve mixing, then the mixing efficiency increases, but the pressure loss increases
Solution Approach 1:
The flow path is designed with a bent configuration instead of a straight path, utilizing three-dimensional spatial arrangement to increase the effective mixing length without proportionally increasing the linear distance. This dimensional optimization improves mixing efficiency while minimizing pressure loss by optimizing the flow path geometry.
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 system enables stable production of self-assembled particles with high size uniformity and throughput, even at high pressure, reducing chip deformation and pulsation.
Implementation Method 1
a self-assembling substance such as lipid nanoparticles can be produced satisfactorily and stably
Data Source
AI summary
A continuous flow microfluidic system for continuous flow operation of a microfluidic chip, in which a pulsation rate of a continuous flow formed by the system is 5% or less.Even when a fluid sample is fed into a microfluidic chip at a high pressure, it is possible to satisfactorily and stably produce self-assembled substance particles such as lipid nanoparticles having high size uniformity, and it is possible to mass-produce such self-assembled substance particles.