Microfluidic Mixing Channel with Trap Zone for Kinetic Analysis
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Solution Overview
Problem
Existing microfluidic systems face challenges with excess solution requirements, leading to increased costs and experimental burdens due to the need for stabilization and sample volume beyond what is immediately analyzed, which hampers the low-volume and low-cost advantages of microfluidics in protein-protein interaction measurements.
Innovation Solution
A microfluidic device with selectively openable solution inlets, loading channels, and a mixing channel that applies fluidic force to mix solutions efficiently, coupled with a microscope system for particle diffusometry analysis, allowing for precise measurement of binding kinetics while minimizing sample usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microfluidic systems are used for protein-protein interaction analysis, then real-time and precise binding kinetics data can be obtained, but the cost of instruments, consumables, and reagents increases significantly
Solution Approach 1:
The system segments the microfluidic device into distinct functional zones: loading channels for reagent delivery, mixing channels for controlled mixing, and detection zones for analysis. This segmentation allows precise control of sample volume and flow rates while maintaining measurement precision through dedicated functional areas.
Solution Approach 2:
The patent introduces an intermediary trapping mechanism that captures and holds excess fluid volume, preventing it from entering subsequent experimental stages. This intermediary zone acts as a buffer that eliminates the need for large volumes of expensive reagents while maintaining the precision of binding kinetics measurements.
2Stability of the object's composition
If syringe pumps are run to remove trapped bubbles and stabilize flow in continuous flow experiments, then flow stability is achieved, but sample solution is wasted during the initial unsteady period
Solution Approach 1:
The system performs preliminary action by pre-loading reagents into separate loading channels before the actual experiment begins. This allows the system to stabilize and remove bubbles without wasting valuable sample solution, as the loading channels can be primed with inexpensive buffer or dummy fluid first.
Solution Approach 2:
The patent extracts the stabilization process from the main experimental flow by separating it into a preliminary phase where bubbles are removed and flow is stabilized in dedicated loading channels. This extraction prevents the wasted sample solution from contaminating the actual protein-protein interaction measurements.
3Quantity of substance
If droplet-based microfluidics are used to reduce sample volume to picoliter range, then sample consumption is minimized, but much more sample solution (mL range) is still required for system stabilization and consistent droplet formation
Solution Approach 1:
The patent extracts the excess fluid volume requirement from the main experimental process by introducing a trapping mechanism that captures and holds the stabilization volume separately. This allows the actual experiment to use only the minimal picoliter-range droplet volumes while the trapping zone absorbs the mL-range volume needed for system stabilization.
Solution Approach 2:
The system segments the fluid volume into two distinct compartments: a small experimental volume for actual protein-protein interaction analysis and a large trapping volume for absorbing excess fluid. This segmentation allows the experiment to leverage the low-volume advantage of microfluidics while the trapping zone handles the bulk volume requirements.
4Quantity of substance
If biomolecular reagents are used in excess fluid volume, then sufficient reagent concentration is maintained, but the experimental burden and cost increase significantly
Solution Approach 1:
The trapping zone acts as an intermediary that decouples the reagent concentration requirement from the total volume used. By capturing excess fluid in the trapping zone, the system maintains high reagent concentration in the small experimental volume while the trapping zone absorbs the bulk volume, significantly reducing the total reagent quantity needed and experimental burden.
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 effectively reduces sample consumption and costs by enabling precise protein-protein interaction analysis with minimal excess solution usage, leveraging the low-volume advantages of microfluidics and providing accurate kinetic measurements.
Implementation Method 1
a fluidic force inlet coupled to the two or more solution inlets and adapted to provide a fluidic force to each respective loading channel
Implementation Method 2
a microscope system optically coupled to the trap zone adapted to irradiate the mixed solution with a light source and return optical emission from the mixed solution to an image capture device
Implementation Method 3
utilizing particle diffusometry
Data Source
AI summary
A microfluidic device is disclosed which includes two or more solution inlets each adapted to be selectively opened and closed and each adapted to receive a respective solution, two or more loading channels each coupled to a respective solution inlet and each adapted to hold the respective solution, a fluidic force inlet coupled to the two or more solution inlets and adapted to provide a fluidic force to each respective loading channel, and a mixing channel coupled to the two or more loading channels and adapted to mix each solution held in each of the two or more loading channels when a fluidic force is applied, the mixing channel terminating at a trap zone adapted to receive the mixed solution from the mixing channel, the trap zone including a fluidic force outlet adapted to release the received fluidic force.