Microfluidic Valve Surface Energy Gradient Fluid Control
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Solution Overview
Problem
Microfluidic diagnostic devices face challenges in controlling fluid flow within small channels, leading to increased complexity, cost, and manufacturability due to reliance on external systems like electric fields and solenoid valves, which require operator intervention and result in inefficient reagent use and solution loss.
Innovation Solution
The use of surface energy gradient coatings to control fluid flow within microfluidic devices, allowing for precise control of fluid velocity, stopping, and starting, reducing the need for external pumps and controllers, and enabling on-board reagents and detection agents for automated sample extraction, mixing, and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external systems like electric fields and solenoid valves are used to control fluid flow, then fluid flow control is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces external mechanical control systems (solenoid valves, pumps) with an integrated microfluidic valve structure that uses surface energy gradients and capillary forces to control fluid flow. The valve comprises a movable diaphragm and fixed wall with channels, where fluid flow is controlled by pressure differential and surface energy effects rather than external mechanical actuation.
Solution Approach 2:
The microfluidic valve operates autonomously using the fluid's own pressure and surface energy properties to control flow. The movable diaphragm responds automatically to pressure changes from the fluid itself, eliminating the need for external control systems. The valve opens and closes based on inherent fluid dynamics rather than external actuation.
2Ease of operation
If external pumps and controllers are used, then fluid flow control is precise, but reagent usage efficiency decreases due to solution loss
Solution Approach 1:
The patent replaces external mechanical pumps with a microfluidic valve system that uses pressure differential and capillary forces to control fluid flow. The valve structure with movable diaphragm and controlled channels enables precise flow regulation without the solution loss associated with external pumping systems.
3Adaptability or versatility
If operator intervention is required for sample extraction and reagent addition, then flexibility is maintained, but productivity decreases
Solution Approach 1:
The patent integrates multiple functions (sample extraction, reagent addition, mixing, and analysis) into a single automated microfluidic device. The valve system coordinates the movement of multiple fluids through integrated channels, combining operations that would otherwise require separate manual steps into one automated process.
Solution Approach 2:
The microfluidic valve and channel system performs multiple functions: controlling flow of sample, reagents, and waste; enabling mixing; and facilitating analysis. This multi-functional integrated system replaces multiple separate operational steps, improving productivity while maintaining operational flexibility.
4Device complexity
If surface energy gradient coatings are used to control fluid flow, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces complex external control systems with surface energy gradient coatings on the channel walls. These coatings create capillary forces that control fluid flow direction and rate, simplifying the overall device structure while requiring precise control of surface energy properties during manufacturing.
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
This approach reduces the complexity and cost of microfluidic systems, minimizes reagent usage, and eliminates the need for operator intervention, enabling efficient and automated fluid handling and analysis within the device.
Implementation Method 1
surface energy gradient coatings to control fluid flow within the product
Implementation Method 2
surface energy gradient coatings to control fluid flow
Data Source
AI summary
1) An analytical device comprisingA) A sample region comprising a first opening and a first cavity within the device configured to receive a sample and closure means for covering the first opening,B) A second cavity comprising an extraction solvent or extraction reagent within the device,C) An extraction region configured to receive at least a portion of the sample from the sample region and at least a portion of the extraction solvent or reaction reagent,D) A reaction region comprising one or more reaction reagents wherein the reaction region is located downstream of the extraction region and is configured to receive liquid flowing from the extraction region,E) A first fluid passage connecting the extraction region to the reaction region wherein the first fluid passage comprises a first surface energy gradient coating,F) A detection region comprising one or more detection agents wherein the detection region is located downstream of the reaction region and is configured to receive liquid flowing from the reaction region.