Multiplex Microfluidic Droplet Formation for Precise Size Control
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Solution Overview
Problem
Existing devices and systems for generating droplets in microfluidic applications are limited in their ability to produce droplets of predictable and desired sizes, and there is a need for improved methods and systems for producing and collecting droplets efficiently.
Innovation Solution
A microfluidic device with a specific configuration of channels, inlets, and droplet source regions, including funnels and rectifiers, that allow for controlled mixing of liquids to form droplets, with optional inclusion of shelves and side-channels to manage fluid flow and droplet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sample and reagent channels are used to increase droplet production capacity, then productivity is improved, but device complexity increases
Solution Approach 1:
The device is divided into multiple independent flow paths, each with its own sample channel and reagent channel that converge at separate intersections. This segmentation allows parallel droplet production while maintaining manageable complexity through modular design. Each intersection acts as an independent droplet source region, enabling high throughput without requiring a single complex channel structure.
Solution Approach 2:
The patent utilizes a two-dimensional planar configuration where sample channels and reagent channels are arranged in orthogonal or parallel orientations on the same microfluidic substrate. This dimensional arrangement allows multiple channels to coexist without excessive vertical stacking complexity, facilitating high throughput droplet generation while maintaining device simplicity through efficient space utilization.
2Manufacturing precision
If funnels and rectifiers are added to control fluid flow, then manufacturing precision of droplet size is improved, but device complexity increases
Solution Approach 1:
Funnels and rectifiers are strategically positioned only at critical locations within the microfluidic device - specifically at channel intersections and droplet source regions where precise flow control is needed. This localized application of flow control components ensures droplet size precision without adding unnecessary complexity to the entire device structure. The funnels guide fluid convergence while rectifiers fine-tune flow rates only where required for droplet formation.
3Productivity
If multiple droplet source regions are created, then productivity is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
Multiple droplet source regions are designed to discharge into a common collection reservoir or integrated detection chamber. This merging approach allows high-throughput droplet production from multiple intersections while consolidating the detection and measurement function into a single location. The collected droplets from all source regions can be analyzed together, maintaining productivity benefits while simplifying detection infrastructure.
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 the production of droplets with precise size control and efficient collection, facilitating high-throughput assays by ensuring consistent droplet formation and collection, suitable for applications such as genetic testing and clinical diagnostics.
Implementation Method 1
allowing a first liquid to flow from the sample inlet via the first and second sample channels to the first and second intersections
Implementation Method 2
allowing one or more third liquids to flow from the first and second reagent inlets via the first and second reagent channels to the one or more intersections
Implementation Method 3
the first liquid and one of the one or more third liquids combine at the one or more intersections and produce droplets in the second liquid at the first and second droplet source regions
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
Devices, systems, and their methods of use, for generating and collecting droplets are provided. The invention provides multiplex devices that increase droplet formation in a limited area.