Droplet Sorting Chip Layout for Impurity Buffering and Accuracy

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Solution Overview

Problem

Droplet sorting chips are prone to clogging and inefficiency due to impurities such as dust and fibers, and minor flow rate changes or external forces can significantly impact sorting accuracy.

Innovation Solution

The droplet sorting chip incorporates a cavity area to accommodate impurities, a sieve structure to deflect and guide droplets, a shield electrode to prevent electric field interference, and a 'X'-shaped sorting channel to enhance accuracy by preventing non-target droplets from entering the target channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the microchannel size is reduced to enable high-throughput droplet sorting, then the droplet sorting efficiency is improved, but the chip becomes highly susceptible to clogging by impurities

Engineering Contradiction:

Improvedroplet sorting efficiencyVSAvoidchip susceptibility to clogging

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The chip is divided into functionally independent modules: a droplet inlet channel for sample introduction, a sorting channel for dielectrophoretic sorting, and a cavity area for impurity accommodation. This segmentation allows each module to perform its specific function while isolating the sorting channel from impurity contamination, enabling high-throughput sorting without clogging risks.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cavity area acts as an intermediary structure between the droplet inlet and the sorting channel. It receives and accommodates impurities that enter with the droplet stream, preventing them from progressing into the sorting channel. This mediator structure protects the critical sorting region from clogging while maintaining high sorting efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the microchannel dimensions are scaled down for precise droplet manipulation, then the droplet control precision is improved, but the impact of external forces and flow rate variations on sorting accuracy increases

Engineering Contradiction:

Improvedroplet control precisionVSAvoidsorting accuracy sensitivity to external factors

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The cavity area is designed as an equipotential region where impurities are accommodated without affecting the electric field distribution in the sorting channel. By isolating the sorting channel from impurity-induced disturbances, the system maintains stable dielectrophoretic forces on droplets, reducing sensitivity to external factors and flow rate variations.

Inventive Principle:

Principle #12Equipotentiality

Solution Approach 2:

Different regions of the chip are assigned different functional qualities: the droplet inlet region accommodates impurities, the sorting channel maintains precise electric field control for dielectrophoresis, and the cavity area provides impurity buffering. This local differentiation ensures that precise droplet manipulation is achieved without the detrimental effects of impurities and external disturbances.

Inventive Principle:

Principle #3Local quality

3Device complexity

If a simple channel structure is used for droplet sorting, then the device complexity is reduced, but the sorting accuracy decreases due to inability to prevent non-target droplet misrouting

Engineering Contradiction:

Improvechannel structure complexityVSAvoidsorting accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The sorting channel is segmented into distinct functional zones: an upstream region receiving droplets from the inlet, a sorting region with electrodes for dielectrophoretic manipulation, and a downstream region with separated outlets for target and non-target droplets. This segmentation enables accurate sorting by providing dedicated zones for each sorting stage while maintaining overall structural simplicity.

Inventive Principle:

Principle #1Segmentation

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 effectively reduces clogging, improves sorting accuracy, and stabilizes the sorting process by preventing impurity entry and electric field interference, enabling high-throughput and precise droplet sorting.

Implementation Method 1

the high-voltage sorting electrode is used to generate a non-uniform electric field, so that the target droplets are subjected to a dielectrophoretic force in the non-uniform electric field to change their flow direction and reach the sorting droplet outlet

Methodology Applied

Scientific EffectDielectrophoresis: Dielectric

Implementation Method 2

the spaced oil phase inlet is used to inject the continuous phase so that the continuous phase drives the mixed solution to flow forward, and can adjust the distance of the droplets and control the flow rate of the droplets

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Data Source

PatentUS12465913B2Droplet sorting chip

Publication Date: 2025.11.11 ZHEJIANG DAPU BIOTECHNOLOGY CO LTD

AI summary

The present invention relates to the field of droplet microfluidics, particularly relates to a droplet sorting chip. The droplet sorting chip disclosed herein is provided with a cavity area, which can accommodate impurities such as fibers entering the droplet sorting chip, can effectively prevent clogging and collision and fusion of droplets caused by impurities, and ensure smooth droplet sorting.