Microfluidic Emulsion Concentration via Pressure Differential Push-Back
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Solution Overview
Problem
Current systems for forming emulsions in high-throughput biomedical assays are inefficient, leading to sample wastage, lack of automation, user skill requirements, and inadequate cross-contamination safeguards.
Innovation Solution
A system comprising a microfluidic chip and instrument that applies pressure differentials to form and concentrate emulsions, with a gasket and cartridge design for sample containment and easy operation, enabling efficient emulsion formation and concentration with reduced sample waste and improved user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If current emulsion formation systems are used, then emulsions can be formed, but sample wastage occurs and incorporation is incomplete
Solution Approach 1:
The patent applies pressure differentials through a manifold system to drive liquid phases through channels and form droplets. The fluidic control system uses pressurized gas or liquid to push samples through the microfluidic chip, enabling complete sample incorporation into droplets without wastage by precisely controlling the flow and breakup of liquid streams.
2Extent of automation
If manual emulsion formation is performed, then flexibility is maintained, but automation is lacking and user skill requirements increase
Solution Approach 1:
The system enables automated emulsion formation where the microfluidic chip and fluidic control system automatically mix phases, form droplets, and concentrate emulsions without manual intervention. The pressure differential system self-regulates flow rates and droplet formation based on pre-set parameters, eliminating the need for user skill in manual manipulation while achieving high-throughput automation.
3Reliability
If conventional emulsion systems are used, then basic functionality is provided, but cross-contamination safeguards are inadequate
Solution Approach 1:
The microfluidic chip segments the sample into discrete droplets within the continuous phase, creating physically isolated compartments. This segmentation prevents cross-contamination between different samples as each droplet is individually formed and contained. The gasket design with sealed channels further segments the fluidic paths, ensuring that samples do not mix between adjacent processing zones.
Solution Approach 2:
The continuous phase acts as an intermediary medium that separates and isolates aqueous sample droplets from each other and from the external environment. The gasket serves as a physical intermediary barrier that seals the microfluidic channels, preventing leakage and cross-contamination while allowing the system to maintain its functional integrity without excessive complexity.
4Manufacturing precision
If emulsions are formed with conventional methods, then droplets are created, but uniformity and monodispersity are poor
Solution Approach 1:
The pressure differential system uses controlled fluid flow through precisely engineered microchannels to generate monodisperse droplets. The hydraulic design ensures uniform shear forces and flow rates at the droplet formation interface, producing droplets with consistent size and spacing. This enables high-throughput formation of uniform emulsions suitable for high-throughput screening applications.
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 achieves more complete sample incorporation, reduced wastage, automated operation, and enhanced safety by forming and concentrating emulsions efficiently, with improved uniformity and monodispersity of droplet sizes.
Implementation Method 1
an instrument configured to operatively receive the device and to create (i) a first pressure differential to produce an emulsion collected in the droplet well and (ii) a second pressure differential to decrease a volume fraction of continuous-phase fluid in the emulsion
Data Source
AI summary
System, including methods, apparatus, and kits, for forming and concentrating emulsions. An exemplary system may comprise a device including a sample well configured to receive sample-containing fluid, a continuous-phase well configured to receive continuous-phase fluid, a droplet well, and a channel network interconnecting the wells. The system also may comprise an instrument configured to operatively receive the device and to create (i) a first pressure differential to produce an emulsion collected in the droplet well and (ii) a second pressure differential to decrease a volume fraction of continuous-phase fluid in the emulsion, after the emulsion has been collected in the droplet well, by selectively driving continuous-phase fluid, relative to sample-containing droplets, from the droplet well.