Microfluidic Diaphragm Valve Using Gas Pressure for Simple Flow Control
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Solution Overview
Problem
Microfluidic device valves have complex structures, leading to high manufacturing costs and increased failure rates, which complicates the control of fluid flow in assays.
Innovation Solution
A microfluidic device utilizing a resilient diaphragm actuated valve, comprising a first substrate, a resilient diaphragm, and an actuator, which forms a gas-tight chamber to control fluid communication by expanding and retracting the diaphragm within a channel, allowing for pressurization and depressurization to open and close the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex valve structure is used to control fluid flow in microfluidic devices, then fluid flow control capability is improved, but manufacturing costs increase and valve failure rates increase
Solution Approach 1:
The valve is divided into separate functional components: a resilient diaphragm for flow control and a rigid actuator for actuation. This segmentation allows each component to be optimized independently and simplifies manufacturing while maintaining effective fluid flow control capability.
Solution Approach 2:
The invention extracts the essential valve function (flow control) from the complex traditional valve structure, achieving it through a simple resilient diaphragm that expands to block the channel when pressurized, eliminating the need for complex mechanical valve components.
2Ease of operation
If a complex valve structure is used to control fluid flow in microfluidic devices, then fluid flow control capability is improved, but manufacturing costs increase
Solution Approach 1:
By segmenting the valve into a resilient diaphragm and a rigid actuator, each component can be manufactured using simpler, more cost-effective processes. The resilient diaphragm can be formed by molding or stamping, while the actuator can be manufactured separately and assembled, reducing overall manufacturing complexity and cost.
Solution Approach 2:
The invention extracts only the essential elements needed for valve operation, eliminating unnecessary complex components. This reduction to essential functions simplifies manufacturing processes and reduces material and assembly costs while preserving fluid flow control capability.
3Ease of operation
If a complex valve structure is used to control fluid flow in microfluidic devices, then fluid flow control capability is improved, but valve failure rates increase
Solution Approach 1:
Segmenting the valve into a resilient diaphragm and rigid actuator allows the resilient component to be designed with inherent flexibility and fatigue resistance, while the rigid actuator provides stable, repeatable actuation. This separation reduces stress concentration and potential failure points compared to integrated complex valve designs.
Solution Approach 2:
By extracting the valve function to a simple resilient diaphragm system, the invention eliminates multiple moving parts, seals, and mechanical linkages that are prone to failure in complex traditional valves, thereby reducing overall valve failure rates while maintaining effective fluid 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
The solution reduces manufacturing costs and valve failure rates by simplifying the valve structure while effectively controlling fluid flow, enhancing the reliability of microfluidic devices for assays.
Implementation Method 1
a resilient diaphragm secured to the second side of the first substrate... expand the resilient diaphragm such that the resilient diaphragm is disposed in the channel... The resilient diaphragm is retractable from the channel to open the channel
Implementation Method 2
A volume of gas is disposed in the gas-tight chamber to pressurize the gas-tight chamber and expand the resilient diaphragm
Data Source
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.