Variable Volume Cavity Droplet Generation Reduces Microchannel Cost
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Solution Overview
Problem
Existing droplet generation methods for nanoliter-scale droplets require micro-channels with diameters below 0.1 mm, which are costly and have strict processing requirements, and struggle with uniformity and stability of droplet formation.
Innovation Solution
A novel droplet generation method using a droplet generation device with a variable volume cavity and a droplet generation tube with distant ports, where a second immiscible liquid is introduced and subjected to periodic vibration, allowing for the formation of droplets with diameters greater than 0.1 mm, reducing the need for precise micro-channel dimensions and lowering production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If micro-channel with diameter below 0.1 mm is used for droplet generation, then nanoliter-scale droplets can be generated, but manufacturing cost increases and processing complexity increases
Solution Approach 1:
The patent changes the key parameter from micro-channel diameter to droplet generation tube inner diameter (greater than 0.1 mm), and introduces a variable volume cavity to control droplet formation through volume changes rather than relying on precise micro-channel dimensions. This parameter change enables the use of larger, easier-to-manufacture components while achieving the same nanoliter-scale droplet generation.
Solution Approach 2:
The patent introduces a variable volume cavity that can dynamically change its volume to control the droplet generation process. This dynamic mechanism replaces the static micro-channel structure, allowing for flexible control of droplet formation without requiring precise and costly micro-channel fabrication.
2Quantity of substance
If micro-channel with diameter below 0.1 mm is used for droplet generation, then nanoliter-scale droplets can be generated, but manufacturing precision requirements increase
Solution Approach 1:
The patent fundamentally changes the dimensional parameter from sub-0.1 mm micro-channel diameter to tube inner diameter greater than 0.1 mm, combined with a variable volume cavity mechanism. This parameter change dramatically reduces manufacturing precision requirements while maintaining the ability to generate nanoliter-scale droplets with uniform size.
Solution Approach 2:
The variable volume cavity acts as an intermediary mechanism between the droplet generation tube and the droplet receiver. It mediates the droplet formation process through volume changes, eliminating the need for precise micro-channel dimensions and simplifying the overall system requirements.
3Quantity of substance
If micro-channel is driven to periodic reciprocating motion for droplet generation, then droplets can be formed, but device complexity increases
Solution Approach 1:
Instead of moving the droplet generation tube periodically, the patent employs a variable volume cavity that changes volume dynamically. This dynamic volume change creates the necessary flow conditions for droplet generation without requiring mechanical motion of the tube, thereby reducing device complexity.
Solution Approach 2:
The patent replaces the mechanical reciprocating motion system with a variable volume cavity mechanism. This substitution eliminates the need for complex mechanical drive systems while achieving the same droplet generation effect through volume-based control.
4Quantity of substance
If micro-channel with strict dimensional requirements is used, then droplet generation can be achieved, but processing cost increases
Solution Approach 1:
The patent changes the critical dimensional parameter from micro-channel diameter (below 0.1 mm with strict tolerances) to droplet generation tube inner diameter (greater than 0.1 mm) combined with variable volume cavity control. This parameter change significantly reduces processing costs by enabling the use of standard manufacturing processes.
Solution Approach 2:
The patent enables the use of disposable droplet generation tubes with larger inner diameters that can be manufactured more cheaply. These tubes don't require precise dimensional control, making them suitable as single-use consumables that reduce overall system cost.
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 the production of uniform nanoliter-scale droplets with reduced processing complexity and cost, using larger structures than traditional microfluidic systems, and allows for the use of general pipette tips as consumables, improving control and stability of droplet formation.
Implementation Method 1
controlling the accommodating cavity to make its volume change periodically, and injecting a driving fluid into the fluid passage to drive the movement of the second liquid
Implementation Method 2
the second liquid being wrapped by the first liquid to obtain droplets, wherein the first liquid and the third liquid are continuous phases, and the second liquid is a dispersed phase
Implementation Method 3
a third liquid immiscible with the second liquid is used to drive the second liquid to flow, and is applied with vibration
Data Source
AI summary
Disclosed are a droplet generation method, system and application thereof. The method breaks through the limitation that the existing nanoliter scale droplet generation technology must use micro-channels below 0.1 mm, and can realize the preparation of small-volume uniform droplets at a reduced cost. The system includes a droplet generation device and a droplet receiver, the droplet generation device includes an accommodating cavity with a variable volume, a control mechanism for controlling the volume of the accommodating cavity to change periodically, and a droplet generation tube, which has a wide range of applications in clinical diagnosis, gene expression analysis, microorganism detection and other fields.