Microfluidic Valve Gate Transmission for Fragile Seal Control
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Solution Overview
Problem
Manufacturing reliable and functional microfluidic valves at a small scale is challenging due to difficulties in forming reliable seals and controlling fragile moving parts without damage.
Innovation Solution
The development of microfluidic valves with a gate transmission element comprising a flexible membrane and plunger, which separates input and output gate terminals, allowing for control of fluid flow by pressurization and depressurization, and includes a flexible bubble to restrict or allow flow through a fluid channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional microfluidic valves are manufactured at small scale, then the valve size is reduced for microfluidic application, but reliable seals and control of moving parts become difficult to achieve
Solution Approach 1:
The patent extracts the plunger from the traditional valve seat configuration and positions it within a cavity, separating the sealing function from the actuation mechanism. This allows the plunger to directly engage with the flexible membrane without requiring precise alignment with a valve seat, thereby maintaining seal reliability at micro-scale dimensions.
Solution Approach 2:
The patent employs a flexible membrane as the sealing element that deforms under pressure to create a seal. This flexible film approach eliminates the need for precise mechanical tolerances and rigid sealing surfaces, enabling reliable sealing in miniaturized valve configurations where conventional rigid seals would fail.
2Productivity
If the valve components are miniaturized for microfluidic systems, then the system integration is improved, but the moving parts become more fragile and difficult to control
Solution Approach 1:
The patent combines the plunger and flexible membrane into an integrated gate transmission element assembly. This merging of components reduces the number of separate moving parts that could fail, while the flexible membrane provides a compliant interface that absorbs stress and prevents brittle failure in miniaturized configurations.
Solution Approach 2:
The patent changes the material parameters by using flexible membrane materials that can deform elastically under actuation pressure. This parameter change from rigid to flexible materials allows the moving parts to withstand repeated actuation cycles without fatigue failure, improving durability in miniaturized valves.
3Measurement precision
If a gate transmission element with flexible membrane and plunger is used, then fluid flow control precision is improved, but the device complexity increases
Solution Approach 1:
The flexible membrane acts as an intermediary between the plunger actuation force and the fluid flow control. This intermediary element translates discrete plunger movements into continuous flow modulation by deforming to varying degrees, achieving precise flow control while keeping the actuation mechanism simple.
Solution Approach 2:
The patent uses fluid pressure within the cavity to actuate the plunger and flexible membrane assembly. This pneumatic/hydraulic actuation method provides smooth, controllable movement of the gate transmission element, enabling precise flow control without complex mechanical positioning systems.
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 solution enables precise control of fluid flow and improves the reliability and durability of microfluidic valves by using a flexible membrane and plunger mechanism, addressing the challenges of seal formation and part fragility at a small scale.
Implementation Method 1
A gate port may be configured to direct drive fluid into the input gate terminal to pressurize the input gate terminal. The gate transmission element may be configured to move within the cavity to restrict the restricting region to inhibit the flow of subject fluid from the inlet port to the outlet port upon pressurization of the input gate terminal, and to expand the restricting region to allow or increase the flow of subject fluid from the inlet port to the outlet port upon depressurization of the input gate terminal.
Implementation Method 2
The gate transmission element may include a flexible membrane coupled to a plunger. The restricting region may be at least partially defined by a flexible bubble positioned within the output gate terminal, over the inlet port and the outlet port, and between the plunger and the inlet port and outlet port.
Data Source
AI summary
The disclosed microfluidic valves may include a valve body having at least one cavity therein, a gate transmission element separating the cavity into an input gate terminal and an output gate terminal, a gate port configured to convey drive fluid into the input gate terminal, and a fluid channel. The gate transmission element may include a flexible membrane and a plunger coupled to the flexible membrane. The gate transmission element may be configured to move within the cavity to inhibit a subject fluid flow from an inlet port to an outlet port of the fluid channel upon pressurization of the input gate terminal, and to allow subject fluid flow from the inlet port to the outlet port upon depressurization of the input gate terminal. Various other related systems and methods are also disclosed.