Membrane Droplet Generation for Stable High-Rate Digital Analysis
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Solution Overview
Problem
Current methods for distributing samples across partitions in a consistent and reliable manner, while maintaining stable isolation and enabling readout from partitions, are limited by costly, labor-intensive, and prone to sample contamination, particularly in microfluidic devices.
Innovation Solution
A device and method for rapidly generating droplets at high rates (up to millions per minute) using a membrane with a low-density hole distribution, stabilized in a collecting container, allowing for stable droplet formation across a wide temperature range and consistent morphology, with a single-tube workflow to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microfluidic devices are used for partitioning, then partitioning can be performed, but the process becomes costly, labor-intensive, and prone to sample contamination
Solution Approach 1:
The device divides the sample fluid into discrete droplets using a membrane with an array of holes, creating isolated partitions for each droplet. This segmentation approach prevents sample contamination between partitions while maintaining operational simplicity.
Solution Approach 2:
The invention employs a simple, disposable membrane with holes instead of complex, expensive microfluidic devices. The membrane can be discarded after use, eliminating contamination risks and reducing costs associated with complex device cleaning and maintenance.
2Productivity
If droplets are generated at high rates, then productivity increases, but droplet stability and isolation may be compromised
Solution Approach 1:
The membrane with an array of holes serves as a porous material that controls droplet formation. The hole size, density, and distribution are optimized to enable high-rate droplet generation while maintaining consistent droplet size and stable isolation, preventing merging even at generation rates exceeding 1 million droplets per minute.
Solution Approach 2:
The invention optimizes parameters including hole diameter (1-10 micrometers), hole density (100-10,000 holes/cm²), and membrane thickness (10-100 micrometers) to achieve the balance between high productivity and droplet stability. These parameter changes enable rapid droplet generation while maintaining reliable isolation.
3Manufacturing precision
If complex microfluidic setups are used, then partitioning can be achieved, but the process becomes costly and labor-intensive
Solution Approach 1:
The invention extracts the essential partitioning function from complex microfluidic devices, isolating only the critical component needed: a membrane with an array of holes. This simplified structure achieves consistent partitioning without the complexity and high manufacturing costs of full microfluidic systems.
Solution Approach 2:
The porous membrane structure provides consistent droplet formation and partitioning through its physical hole array, eliminating the need for complex microfluidic channels, pumps, and control systems. This approach maintains manufacturing precision while dramatically simplifying the manufacturing process.
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 system enables high-throughput, cost-effective, and contamination-free digital analysis by generating stable droplets at extreme rates, suitable for various bioassays and digital analyses, with improved signal readout and reduced sample volume requirements.
Implementation Method 1
using centrifugal or pressure forces
Implementation Method 2
using centrifugal or pressure forces
Implementation Method 3
the droplets are stable across a wide range of temperatures (e.g., 1° C. through 95° C., greater than 95° C., less than 1° C.) relevant to various digital analyses and other bioassays, where the droplets remain consistent in morphology and remain unmerged with adjacent droplets
Data Source
AI summary
This disclosure provides for devices, methods, and systems for generating a plurality of droplets within a collecting container at an extremely high rate (e.g., of at least 1 million droplets per minute, etc.), each of the plurality of droplets comprising an aqueous mixture for a digital analysis, wherein upon generation, the plurality of droplets is stabilized in position within a region of the collecting container. The inventions enable partitioning of samples for digital analyses at unprecedented rates, where readout of signals from targets within such partitions can still be achieved in accordance with various assays.