Microparticle Sorting Microchip Trap Channel Segmentation
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Solution Overview
Problem
Current microparticle sorting microchips face limitations in achieving high-speed, high-purity, and high-acquisition rate sorting of microparticles.
Innovation Solution
The microparticle sorting microchip incorporates a unique structure with a trap channel and pressure chamber configuration, including multiple stages of trap channels and gate channels, which control fluid flow and pressure to efficiently trap and release microparticles, reducing channel resistance and draw volume, and utilizing a piezo element for pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional single-stage trap channel is used, then the structure is simple, but the sorting speed and acquisition rate are limited
Solution Approach 1:
The trap channel is divided into multiple stages (first-stage trap channel and second-stage trap channel) with different functions. The first stage focuses on rapid particle capture while the second stage handles gate flow integration and particle ejection. This segmentation enables high-speed sorting by optimizing each stage for its specific function rather than using a single generic channel design.
Solution Approach 2:
The channel structure incorporates dynamic pressure control through the piezo element to actively manage fluid flow rates and pressure gradients during different operational phases (trapping, holding, ejecting). This dynamic control allows the system to adapt flow conditions in real-time, maximizing sorting speed and particle recovery efficiency.
2Quantity of substance
If the trap channel cross-sectional area is large, then more particles can be trapped, but the draw volume increases and back release occurs
Solution Approach 1:
The trap channel is segmented into two stages with progressively smaller cross-sectional areas. The first stage has a larger area for initial particle capture, while the second stage has a reduced area that minimizes draw volume and prevents back release. This segmentation allows the system to capture sufficient particles while maintaining low draw volume in the critical ejection region.
Solution Approach 2:
Different cross-sectional areas are applied at different locations along the trap channel based on local functional requirements. The upstream portion has larger dimensions for particle accumulation, while the downstream portion near the pressure chamber has smaller dimensions to reduce draw volume and prevent back release of trapped particles during ejection operations.
3Productivity
If gate channels are not integrated, then the trap channel structure is simpler, but particle ejection efficiency is reduced
Solution Approach 1:
The gate channels are integrated directly into the second-stage trap channel, merging the particle ejection function with the trapping function in a single unified structure. This integration allows gate flows to be precisely positioned at the trap channel outlet, enabling efficient particle ejection into the pressure chamber while maintaining a compact overall design.
Solution Approach 2:
The second-stage trap channel serves as an intermediary structure that receives particles from the first stage, integrates gate flow inputs, and facilitates controlled ejection into the pressure chamber. This intermediary channel design enables coordinated action between trapping and ejection functions, improving overall particle recovery efficiency.
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 configuration enhances the sorting speed, purity, and acquisition rate of microparticles by minimizing back release and optimizing the trap channel design, allowing for efficient sorting and collection of microparticles.
Implementation Method 1
utilizing a piezo element for pressure control
Implementation Method 2
the pressure chamber generates a negative pressure
Implementation Method 3
suppresses a spiral flow field generated after merging of a laminar flow of a sample fluid and a laminar flow of a sheath fluid, thereby avoiding turbulence in the laminar flow of the sample fluid
Data Source
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Figure 7~9
AI summary
A microparticle sorting microchip for a flow cytometer is provided to enable sorting of microparticles at higher speed, higher purity, and higher acquisition rate. The microparticle sorting microchip includes a main channel through which a microparticle-containing fluid flows, a trap channel coaxially communicating with the main channel, a trap chamber communicating with the trap channel, and a gate channel intersecting the trap channel. The trap channel has an opening intersecting the gate channel. The trap channel has a smaller cross-sectional area upstream of the opening than downstream of the opening along a direction in which the microparticle-containing fluid flows.