Pneumatic Diaphragm Microfluidic Valve With Simpler Structure
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Solution Overview
Problem
Existing microfluidic device valves are complex, leading to high manufacturing costs and increased failure rates.
Innovation Solution
A microfluidic device utilizing a resilient diaphragm actuated valve, comprising a first substrate, a resilient diaphragm, and an actuator, forms a gas-tight chamber to control fluid communication by expanding and retracting the diaphragm within a channel using pneumatic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional valves are used in microfluidic devices, then fluid flow control is achieved, but manufacturing complexity and failure rates increase
Solution Approach 1:
The patent extracts the valve function from a separate complex component and integrates it directly into the microfluidic chip structure. The valve is formed by bonding a first substrate to a second substrate with recesses, eliminating the need for separate valve bodies and moving parts, thereby reducing overall device complexity while maintaining reliability
Solution Approach 2:
The patent employs flexible membranes as the valve closing element. These thin film structures are bonded between the two substrates and can deform elastically in response to pressure changes, providing reliable flow control without requiring complex mechanical actuation mechanisms, thus improving reliability while reducing structural complexity
2Ease of manufacture
If complex valve structures are used, then fluid flow control is achieved, but manufacturing costs increase
Solution Approach 1:
The valve is segmented into distinct functional layers: a first substrate with inlet/outlet channels, a flexible membrane layer, a second substrate with recesses, and sealing layers. This segmentation allows each layer to be manufactured separately using standard semiconductor or microfabrication techniques, then bonded together, significantly reducing manufacturing costs compared to machining complex integrated valve assemblies
Solution Approach 2:
The patent uses pneumatic pressure applied to the flexible membrane to actuate the valve. This pneumatic actuation mechanism is simple to manufacture and control, replacing complex mechanical linkages, springs, or motors, thereby reducing manufacturing costs while maintaining effective flow control
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
Reduces manufacturing complexity and failure rates of the valve, thereby lowering costs and improving reliability.
Implementation Method 1
A volume of gas is disposable in the gas-tight chamber to pressurize the gas-tight chamber and expand the resilient diaphragm
Implementation Method 2
The resilient diaphragm is retractable from the channel to open the channel from the first end and the second when the gas-tight chamber is depressurized
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A microfluidic device has a first substrate, a resilient diaphragm, an actuator, and a second substrate. The first substrate has an opening extending therethrough. The resilient diaphragm is secured to a second side and surrounds the opening. The actuator is secured to a first side and surrounds the opening. The first substrate, the resilient diaphragm, and the actuator cooperate to form a gas-tight chamber. The second substrate has a channel formed therein having a first end and a second end. The second substrate is secured to the first substrate. A volume of gas disposed in the gas-tight chamber pressurizes the gas-tight chamber and expands the resilient diaphragm such that the resilient diaphragm is disposed in the channel between the first end and the second end. The resilient diaphragm retracts from the channel to open the channel from the first end and the second when the gas-tight chamber is depressurized.