Microchip Branch-Channel Sorting for Stable Microparticle Extraction
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Solution Overview
Problem
Current microparticle sorting methods for microchip-type apparatuses face challenges in achieving rapid and stable extraction of target microparticles from a sheath flow in a channel, which affects the speed and accuracy of analysis.
Innovation Solution
A microparticle sorting method that generates negative pressure in a branch channel to collect target microparticles by forming a counter flow that opposes the main channel flow, using an actuator to deform the branch channel and increase its volume, allowing for efficient separation and recovery of target particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an actuator is used to control the feeding direction of sheath flow at a channel branching portion by pressing against a chamber, then the sheath flow direction can be controlled, but the structure becomes complex and the response speed is limited
Solution Approach 1:
The invention extracts the function of controlling sheath flow direction from a complex actuator-chamber system and relocates it to a branching portion structure. By forming a branch channel that communicates with the main channel at a specific position, the sheath flow naturally divides at the branching portion, eliminating the need for complex actuators and chambers while achieving the same directional control function.
Solution Approach 2:
The invention introduces a branch channel as an intermediary structure between the main channel and the collection chamber. This branch channel serves as a mediator that naturally guides and divides the sheath flow through its geometric configuration and communication opening position, replacing the need for direct actuator intervention in the main flow path.
2Ease of operation
If laser irradiation is used to generate air bubbles for controlling sheath flow direction at a branching portion, then the sheath flow can be redirected, but the system requires complex optical components and energy consumption increases
Solution Approach 1:
The invention extracts the flow control function from the laser-induced bubble mechanism and implements it through passive geometric features of the branch channel. The communication opening position and channel geometry naturally guide the sheath flow division without requiring energy input from laser irradiation, eliminating the need for optical components and reducing energy consumption.
Solution Approach 2:
The branch channel structure serves itself to control flow direction through its inherent geometric configuration. The communication opening positioned near the branching portion automatically creates flow division based on pressure gradients and fluid dynamics principles, without requiring external energy input or active control mechanisms.
3Stability of the object's composition
If the communication opening between main channel and branch channel is positioned far from the branching portion, then stable flow is achieved, but the sorting speed decreases
Solution Approach 1:
The invention applies local quality by positioning the communication opening at a specific location near the branching portion rather than uniformly distributing flow control features. This localized positioning creates a focused flow division zone that simultaneously maintains stability through proper geometric configuration and achieves high sorting speed by minimizing the distance target particles must travel to enter the collection chamber.
4Quantity of substance
If a large volume chamber is used to collect target microparticles, then the collection capacity increases, but the device size and complexity increase
Solution Approach 1:
The invention implements nesting by integrating the collection chamber within the existing microchip structure. The branch channel and communication opening are formed as nested features within the main channel system, allowing the collection chamber to be positioned adjacent to the main channel without adding significant external volume. This nested configuration maximizes collection capacity while maintaining a compact overall device size.
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 method enables rapid and stable extraction of target microparticles, preventing non-target particles from entering the branch channel and ensuring high accuracy and efficiency in sorting operations.
Implementation Method 1
generating a negative pressure in the branch channel
Implementation Method 2
a flow of a fluid is formed that flows toward a side of the main channel from a side of the branch channel
Data Source
AI summary
There is provided a microparticle sorting method including a procedure of collecting a microparticle in a fluid that flows through a main channel in a branch channel that is in communication with the main channel by generating a negative pressure in the branch channel. In the procedure, a flow of a fluid is formed that flows toward a side of the main channel from a side of the branch channel at a communication opening between the main channel and the branch channel.