Microfluidic Device Bridge Channel for Droplet Dilution
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Solution Overview
Problem
Conventional microfluidic devices face challenges in accurately mixing and diluting micro-droplets with varying ratios due to the influence of surface tension and wettability, leading to difficulties in achieving precise and reproducible results, especially in multi-stage dilution processes.
Innovation Solution
A microfluidic device with a micro-channel structure featuring multiple connected mixing units, each comprising measuring, merging, and mixing sections, along with a flow path opening and closing mechanism, allows for precise control and synchronization of micro-droplet extrusion and mixing, enabling the preparation of micro-droplets with various dilution ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If micro-droplets are transported through micro-channels with very small width for dilution, then portability and handling are improved, but surface tension and wettability have significant influence making quantitative measuring difficult
Solution Approach 1:
A bridge channel is introduced as an intermediary component between the first and second micro-channels. This bridge channel serves as a mediator that receives micro-droplets from the first micro-channel and transfers them to the second micro-channel, enabling quantitative control of micro-droplet transfer while maintaining the benefits of narrow micro-channel dimensions for portability.
2Adaptability or versatility
If multiple mixing units are connected in series for multi-stage dilution, then dilution ratios are improved, but synchronization of micro-droplet extrusion becomes difficult due to surface tension effects
Solution Approach 1:
The bridge channel acts as a synchronization intermediary that coordinates the transfer of micro-droplets between sequentially connected mixing units. By controlling the flow through this intermediate bridge structure, the system achieves synchronized extrusion of micro-droplets across multiple mixing stages, enabling reliable multi-stage dilution operations.
Solution Approach 2:
The bridge channel is designed to pre-position and prepare micro-droplets before they enter the second micro-channel. This preliminary action in the bridge channel ensures that micro-droplets are properly formed and synchronized before entering subsequent mixing units, maintaining reliability across multiple dilution stages.
3Volume of moving object
If micro-channel diameter is reduced to 5 micrometers to 1 mm for trace liquid handling, then trace liquid handling capability is improved, but surface tension influence increases making mixing difficult
Solution Approach 1:
The bridge channel serves as an intermediary mixing zone where micro-droplets from the first micro-channel are received and combined with diluent before entering the second micro-channel. This intermediate structure provides a controlled environment for mixing operations, reducing the direct impact of surface tension effects that would otherwise dominate in the narrowest micro-channel sections.
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 device enables accurate and reliable preparation of micro-droplets with multiple dilution ratios, overcoming the limitations of surface tension and wettability, and facilitating efficient multi-stage mixing and dilution processes.
Implementation Method 1
the surface tension of the micro-droplet, the wettability of the wall surface of the micro-channel, etc. have significant influence
Implementation Method 2
the surface tension of the micro-droplet, the wettability of the wall surface of the micro-channel, etc. have significant influence
Implementation Method 3
the surface tension of the micro-droplet, the wettability of the wall surface of the micro-channel, etc. have significant influence
Implementation Method 4
Following patent document 1 discloses a method of forming a proteinic crystal in a laminar flow using a microfluidic device
Implementation Method 5
a mixing section for mixing the first and the second micro-droplets
Data Source
AI summary
A microfluidic device provided with a micro-channel structure capable of easily and positively providing therein micro-droplet having various dilution ratios. A micro-channel structure provided in a substrate (2) has a first mixing unit (11) and a second mixing unit (21) connected to the downstream side of the first mixing unit (11), with each mixing unit (11, 21) having first through third micro-channels. One end of a first weighing unit (11d) consisting of a micro-channel having a capacity equivalent to the volume of a specified-amount first micro-droplet is opened to a first micro-channel (11a), and the other end is opened to a merging unit (12a) provided on a second micro-channel (12). One end of a second weighing unit (13d) consisting of a micro-channel having a capacity equivalent to the volume of a specified-amount second micro-droplet is connected to a third micro-channel (13), and the other end is opened to the merging unit (12a). Any one of the first through third outlet ports of the first mixing unit is connected with the first or the third inlet port of the second mixing unit (21).