Thermal Gas-Actuated Membrane Valve for Leak-Free Fluid Isolation
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Solution Overview
Problem
Existing microfluidic devices require complex external pneumatic means for actuating fluidic valves, which can lead to issues like air or fluid leakage, noise from pumps or compressors, and regulatory challenges, particularly when transporting these devices.
Innovation Solution
A fluidic valve device with a sealed reservoir filled with expandable gas, a deformable membrane to control fluid flow, and a heating module to expand the gas and actuate the membrane, allowing for simple and reliable operation without external pneumatic connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external pneumatic means (pumps, compressors) are used to actuate fluidic valves, then reliable fluid flow control is achieved, but device complexity and risk of leakage increase
Solution Approach 1:
The patent extracts the pressure generation function from external pneumatic means and relocates it into the device itself by incorporating a gas cartridge and reservoir system. This eliminates the need for external pumps and compressors, reducing device complexity and leakage risks while maintaining reliable fluid flow control through the deformable membrane valve mechanism.
Solution Approach 2:
The patent introduces a deformable membrane as an intermediary element between the gas pressure source and the fluidic circuit. The membrane translates gas expansion into mechanical action that controls fluid flow, providing reliable valve actuation without requiring direct pneumatic connections to external equipment.
2Stress or pressure
If pumps or compressors are used as pressure sources, then sufficient gas pressure is generated, but noise is produced
Solution Approach 1:
The patent employs a disposable gas cartridge as the pressure source instead of reusable pumps or compressors. The cartridge provides sufficient gas pressure for valve actuation and is replaced when depleted, eliminating the noise generated by mechanical pressure-generating devices while maintaining the required pressure levels.
Solution Approach 2:
The patent replaces the mechanical pressure generation system (pumps/compressors) with a chemical/physical pressure source (gas cartridge expansion). This substitution eliminates the mechanical noise associated with traditional pressure-generating equipment while providing the necessary gas pressure for deformable membrane actuation.
3Object-generated harmful factors
If gas cartridges are used as pressure sources, then noise is reduced, but pressure regulation becomes challenging
Solution Approach 1:
The patent performs preliminary pressure regulation by pre-configuring the gas cartridge system with appropriate reservoir volumes and membrane characteristics. The design ensures that gas expansion naturally provides the required pressure range for valve actuation without requiring additional active regulation mechanisms, simplifying operation while maintaining noise reduction benefits.
Solution Approach 2:
The patent utilizes parameter changes in the gas expansion process (temperature, volume, pressure) to achieve effective valve actuation. By designing the reservoir and membrane system to exploit these natural parameter variations, the device achieves adequate pressure control without complex regulation systems, maintaining ease of operation alongside noise reduction.
4Ease of manufacture
If multilayer assembly with glued membranes is used, then valve structure is formed, but manufacturing precision and reliability decrease
Solution Approach 1:
The patent merges the membrane attachment functions into a unified integration process where the deformable membrane is seamlessly incorporated with the reservoir and substrate structures. This combined design eliminates multiple separate attachment steps (gluing, pinching, adhesive application) and creates inherent sealing through the integrated structure, improving both manufacturing efficiency and connection reliability.
Solution Approach 2:
The patent designs the deformable membrane to serve multiple functions simultaneously: it acts as the valve closing element, the sealing interface with the substrate, and the mechanical transmission component. This multi-functional design eliminates the need for separate sealing components and adhesive layers, improving manufacturing precision and reliability while simplifying the overall structure.
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 compact, reliable, and easily transportable fluidic valve mechanism that can be quickly deployed, minimizing the risk of leakage and noise, while also allowing for precise control of fluid flow and isolation of reaction chambers during analysis.
Implementation Method 1
a heating module arranged to heat said volume of gas contained in said reservoir and controlled to heat it to a temperature sufficient to expand said volume of gas present in the reservoir, causing a deformation of the membrane from its first position to its second position
Data Source
Figure 1~2P2
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AI summary
The invention relates to a fluidic component (1) intended to be associated with a heating module (M1) and in which a fluidic circuit is made which includes an inlet channel (36) and an outlet channel (37), said fluidic component comprising: - A fluidic valve mechanism (33) comprising: o A sealed reservoir (32), intended to be filled with a volume of gas (38) capable of expanding, o A deformable membrane (35) closing said reservoir (32) in a sealed manner, said membrane (35) being capable of deforming by expansion of the volume of gas between a first position in which it forms a passage between said inlet channel and said outlet channel to allow a fluid (F) to pass through, and a second position in which it closes said passage.