Microfluidic Channel Separating Microparticles Without Flow Rate Control
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Solution Overview
Problem
Current methods for separating microparticles from fluids, such as cells and DNA, face challenges including the need for high-priced equipment, complexity in operation, and dependence on precise flow rate control, which limits portability and practicality.
Innovation Solution
An apparatus with a microfluid channel unit featuring alternating expanding and reducing channels with an inclined lateral surface, driven by a pressure generator like a pipette or syringe, allowing for microparticle separation regardless of flow rate without additional energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centrifuge is used to separate cells and cell suspensions, then separation effectiveness is improved, but apparatus cost and portability deteriorate
Solution Approach 1:
The patent replaces the complex mechanical centrifuge system with a microfluidic channel system that uses fluid flow and geometric structures (expanding/reducing channels with inclined surfaces) to achieve particle separation through hydrodynamic forces, eliminating the need for expensive and portable centrifuge equipment
Solution Approach 2:
The patent extracts the core separation function from the complex centrifuge apparatus and implements it in a simplified microfluidic device that contains only the essential elements (channel structure and fluid flow) needed for separation
2Measurement precision
If capillary electrophoresis is used to separate particles, then separation precision is improved, but energy consumption and applicability to non-polar particles deteriorate
Solution Approach 1:
The patent replaces the electrophoresis method that uses electrical fields with a passive microfluidic method that uses fluid flow dynamics and geometric channel structures, eliminating the need for high voltage power supplies while achieving separation based on particle size and shape
3Adaptability or versatility
If dielectrophoresis separation method is used, then non-polar particles can be separated, but electrolysis occurs and additional energy sources are required
Solution Approach 1:
The patent replaces dielectrophoresis that requires electrical fields and power sources with a passive microfluidic system using flow energy and geometric channel structures, eliminating electrolysis risks and additional energy sources while maintaining the ability to separate various particle types including non-polar particles
4Device complexity
If passive separation method with microflow channel is used, then additional apparatus is eliminated, but precise flow rate control is required
Solution Approach 1:
The patent uses dynamic channel structures (expanding and reducing sections with inclined surfaces) that adapt to different flow rates, allowing particles to be focused and separated at various flow conditions without requiring precise flow rate control, making the device easier to operate
Solution Approach 2:
The patent changes the channel geometry parameters (expanding/reducing sections) to create flow conditions that enable particle separation across a range of flow rates, eliminating the need for precise flow control while maintaining separation effectiveness
5Reliability
If hydrophoretic element is used, then cell separation is achieved, but cell removal efficiency decreases when flow rate is increased
Solution Approach 1:
The patent uses dynamic channel structures with expanding and reducing sections that maintain particle focusing and separation effectiveness across different flow rates, allowing high productivity at increased flow rates without sacrificing separation reliability
6Reliability
If inertial fluidic element is used, then cell separation is achieved, but cell removal efficiency decreases when flow rate is reduced
Solution Approach 1:
The patent optimizes channel geometry parameters (expanding/reducing sections with inclined surfaces) to maintain effective particle separation across a broad range of flow rates, ensuring high cell removal efficiency whether flow rate is increased or reduced
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
Enables simple, rapid, and efficient separation of microparticles from fluids, including cells and blood components, in a portable and cost-effective manner, without requiring high-priced apparatuses or precise flow rate control.
Implementation Method 1
the microparticle separation unit is driven using pressure generated by a pressure generator fastened to the microfluid injection unit
Implementation Method 2
the passive separation method has a merit in that microparticles are separated without an additional apparatus other than a microflow channel by using flow energy for sample supply
Data Source
AI summary
Disclosed is an apparatus for separating microparticles and a method of separating the microparticles from a fluid containing the microparticles to separately provide the microparticles and the fluid from which the microparticles are removed using the same. The microparticles are capable of being separated even via a manual operation including a pipette or a syringe, regardless of a flow rate.