Thermally Actuated Fluidic Valve Isolation Without External Pneumatics
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Solution Overview
Problem
Existing microfluidic devices require complex external pneumatic means for actuating fluidic valves, which are prone to leaks and noise, and often involve the use of pumps or compressors that are cumbersome and regulated, especially for transportation.
Innovation Solution
A fluidic component with a built-in fluidic valve mechanism featuring a gas-filled reservoir and a deformable membrane, where a heating module expands the gas to deform the membrane and control fluid flow, eliminating the need for external pneumatic connections and using chemical reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external pneumatic means (pumps or compressors) are used to actuate fluidic valves, then reliable fluid control is achieved, but device complexity and susceptibility to leaks increase
Solution Approach 1:
The invention extracts the pressure source function from external pneumatic means and integrates it directly into the microfluidic device through an effervescent reaction chamber. This eliminates the need for external pumps or compressors, thereby reducing device complexity and susceptibility to leaks while maintaining reliable fluid control through internally generated pressure.
Solution Approach 2:
The device uses an effervescent reaction between reagents to self-generate the pressure needed for actuating fluidic valves. This self-service mechanism eliminates dependence on external pneumatic systems, reducing complexity and leak risks while maintaining reliable fluid control through autonomous pressure generation.
2Ease of operation
If external pneumatic means are used for valve actuation, then fluid flow control is achieved, but noise and regulatory issues arise
Solution Approach 1:
The invention replaces mechanical pneumatic systems (pumps and compressors) with a chemical effervescent reaction system to generate pressure for fluid flow control. This substitution eliminates the noise associated with mechanical devices and avoids regulatory restrictions on transporting pneumatic equipment, while maintaining ease of operation through simple reagent-based actuation.
Solution Approach 2:
The invention changes the method of pressure generation from mechanical (pumps/compressors) to chemical (effervescent reaction). This parameter change eliminates noise generation and regulatory issues associated with transporting pneumatic equipment, while maintaining effective fluid flow control through the generated pressure.
3Reliability
If chemical reagents are used to generate pressure, then simple and reliable actuation is achieved, but precise pressure control becomes difficult
Solution Approach 1:
The invention uses a deformable membrane to locally control fluid flow based on pressure distribution from the effervescent reaction. The membrane's localized deformation at specific regions allows precise control of individual fluidic channels despite the global pressure generation from chemical reaction, achieving both reliability and precision.
Solution Approach 2:
The invention employs a deformable membrane as a flexible element that responds to pressure from the effervescent reaction. This thin film allows precise local control of fluid flow by deforming in response to pressure distribution, enabling accurate valve actuation while maintaining the simplicity of chemical pressure generation.
4Device complexity
If a deformable membrane is used for valve actuation, then simple valve mechanism is achieved, but leak-free operation becomes challenging
Solution Approach 1:
The invention merges the valve actuation function with the pressure generation system by using the effervescent reaction chamber to directly pressurize the membrane. This integration ensures that the pressure source and valve mechanism work as a unified system, achieving leak-free operation through proper sealing design while maintaining simple valve mechanism structure.
Solution Approach 2:
The invention extracts the sealing requirements from complex external pneumatic connections and focuses them on the internal membrane-seal interface. By eliminating external pneumatic connections and using an integrated effervescent pressure source, the design achieves leak-free operation through simplified sealing at the membrane level while maintaining low complexity.
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 simple, reliable, and leak-free actuation of the fluidic valve mechanism, allowing for rapid deployment and integration of a pressure source within the device, reducing noise and regulatory issues, while maintaining efficient fluid control and minimizing evaporation during reactions.
Implementation Method 1
a heating module designed to heat said volume of gas contained in said reservoir and commanded to heat it to a temperature sufficient to expand said volume of gas present in the reservoir
Implementation Method 2
A deformable membrane closing said reservoir in a fluidtight manner, said membrane being able to deform by expansion of said volume of gas, between a first position in which it forms a passage between said inlet channel and said outlet channel
Data Source
AI summary
A fluidic component intended to be associated with a heating module and wherein there is created a fluidic circuit which includes an inlet channel and an outlet channel, the fluidic component including a fluidic valve mechanism including: a fluidtight reservoir intended to be filled with a volume of gas capable of expanding, a deformable membrane closing the reservoir in a fluidtight manner, the membrane being able to deform by expansion of the volume of gas, between a first position wherein it forms a passage between the inlet channel and the outlet channel so as to allow a fluid to pass, and a second position wherein it obstructs the passage.