Phase-Change Membrane Valve for Clean Microfluidic Actuation
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Solution Overview
Problem
Current microfluidic valve technologies face challenges such as complexity in actuation mechanisms, integration of different materials, chemical incompatibility of phase change materials with fluids, and mechanical instability due to temperature variations, which complicate design and operation.
Innovation Solution
A normally closed fluidic valve using a deformable membrane held in place by a phase change material that changes state to release mechanical stress, allowing the membrane to open, with a porous second element allowing the phase change material to penetrate and create space for fluid flow, avoiding direct contact and material incompatibility issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pneumatic actuation means are used to control the membrane, then the valve can be actuated between open and closed states, but the device complexity increases due to external pumps, compressors, pressure regulators, and control circuits
Solution Approach 1:
The invention extracts the phase change material from direct contact with the fluid by placing it in a sealed cavity behind the membrane. This allows the material to provide actuation force without contaminating the fluid, simplifying the overall system by eliminating the need for complex sealing mechanisms while maintaining fluid purity.
Solution Approach 2:
The sealed cavity acts as an intermediary between the phase change material and the fluid. The material changes phase within the cavity to move the membrane, while the cavity wall prevents direct contact between the material and fluid, resolving the contradiction between simple actuation and fluid compatibility.
2Device complexity
If phase change material is used to actuate the valve, then simple actuation is achieved, but the material may chemically interact with or contaminate the fluid
Solution Approach 1:
The phase change material is extracted from the fluid path and placed in a separate sealed cavity. This physical separation eliminates the harmful interaction between the material and fluid while preserving the simple actuation mechanism, as the material still moves the membrane through pressure changes within its enclosed space.
Solution Approach 2:
The sealed cavity is designed to prevent fluid leakage and contamination before any harmful interaction can occur. By establishing this barrier in advance, the system prevents potential pollution while maintaining the benefits of phase change actuation.
3Force
If the phase change material is in direct contact with the fluid to actuate the valve, then direct mechanical action is achieved, but material incompatibility and chemical reactions occur
Solution Approach 1:
The sealed cavity wall serves as an intermediary that transmits the actuation force from the phase change material to the membrane without allowing direct contact between incompatible materials. This maintains the reliability of material compatibility while preserving the effectiveness of the actuation force.
4Ease of operation
If complex pneumatic connections are used to actuate the valve, then external control is achieved, but leakage risks increase
Solution Approach 1:
The invention merges the actuation mechanism with the valve body by integrating the phase change material cavity directly into the valve structure. This eliminates separate pneumatic connections and external control lines, thereby eliminating leakage risks while maintaining full control capability through the solid-state phase change mechanism.
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 solution provides a reliable, easy-to-implement, and pollution-free fluid control mechanism that maintains the valve in a closed state without complex actuation or moving parts, ensuring precise fluid management and reducing mechanical uncertainties.
Implementation Method 1
A first element (101, 102, 103) made of a phase-change material, capable of changing from a solid state to a liquid state under the effect of heat
Implementation Method 2
the first element in the liquid state, capable of penetrating into the open cells of the second element (201, 202, 203), freeing said space necessary for the membrane (4) to move to its open position
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3
AI summary
The invention relates to a normally closed fluidic valve type device comprising a support (3) in which a fluidic passage is made for a fluid (F) to pass through, said device comprising: - A deformable membrane (4), capable of moving between a closed position of the fluidic passage and an open position of the fluidic passage, - Means of mechanically holding the membrane (4) in the closed position, - The mechanical holding means comprising a first element (10_1, 10_2, 10_3) made of a phase change material, capable of passing from a solid state to a liquid state under the effect of heat and a second element (20_1, 20_2, 20_3).