Membrane Droplet Generation for Stable High-Rate Digital Partitioning
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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 (e.g., 200,000 to 1 million droplets/minute) using a substrate with a membrane having low-density holes, stabilized within a collecting container, allowing for consistent droplet formation and isolation across a wide temperature range, with optional centrifugation for surface profile adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microfluidic devices are used for partitioning samples, then partitioning can be performed, but the process becomes costly, labor-intensive, and prone to sample contamination
Solution Approach 1:
The invention divides the sample into discrete droplets using a simple membrane with holes, avoiding complex microfluidic channel networks. Each hole in the membrane creates a separate partition, achieving reliable sample isolation through geometric segmentation rather than complex fluidic pathways.
Solution Approach 2:
The invention uses simple, inexpensive membranes with hole distributions that can be disposed of after single use, eliminating the need for costly, complex microfluidic devices. The membrane serves as a single-use partitioning element that prevents contamination while keeping costs low.
2Reliability
If partitioning is performed to isolate samples, then sample isolation is achieved, but the partitioning rate is slow
Solution Approach 1:
The invention uses a porous membrane with a distribution of holes to simultaneously create multiple partitions. The porous structure allows rapid formation of numerous droplets in parallel, achieving both high isolation reliability and high partitioning rate by processing many samples simultaneously through the membrane's hole distribution.
3Productivity
If droplets are generated at high rates, then productivity is improved, but droplet stability and isolation may be compromised
Solution Approach 1:
The invention optimizes membrane parameters including hole diameter, hole density, and membrane material properties to achieve the desired balance. By carefully selecting these parameters, the system generates droplets at high rates while maintaining stable isolation, as the membrane parameters control both generation speed and droplet formation quality.
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 cross-contamination.
Implementation Method 1
application of a force to the device or sample fluid generates a plurality of droplets within the collecting container
Implementation Method 2
the droplets are stabilized in position (e.g., in a close-packed format, in equilibrium stationary positions) within the collecting container
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.