Thermally Actuated Elastomeric Microfluidic Valve Design
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Solution Overview
Problem
Current microfluidic valves require expensive, bulky, and high-power external equipment for pneumatic actuation, limiting their portability, cost-effectiveness, and scalability for complex liquid handling.
Innovation Solution
A thermally or mechanically actuated fluidic valve design using a planar elastomer layer between two rigid substrates, where localized heating or pressure changes the state of the valve, allowing for efficient and portable fluid control without external equipment, utilizing materials like polydimethylsiloxane and patterned resistors for actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If pneumatic valves are used for fluid control, then automation capability is achieved, but device complexity and equipment cost increase due to required external pressure tanks, regulators, and solenoid valves
Solution Approach 1:
The patent extracts the actuation function from external pneumatic equipment and integrates it directly into the valve structure itself. The valve body incorporates heating elements and thermally responsive materials, eliminating the need for external pressure tanks, regulators, and solenoid valves while maintaining automated fluid control capability.
Solution Approach 2:
The patent merges the actuation mechanism with the valve body into a single integrated structure. The heating elements are embedded within or attached to the valve body, and the thermally responsive material is positioned between the heating element and the fluid passage, creating a unified actuation-valve assembly that eliminates multiple separate components.
2Extent of automation
If pneumatic valves are used for fluid control, then automation capability is achieved, but power consumption increases due to high-power external equipment
Solution Approach 1:
The patent replaces the mechanical pneumatic actuation system with a thermal field-based actuation system. Instead of using high-power pneumatic motors or solenoids that convert electrical energy to mechanical motion, the system uses low-power heating elements to generate thermal fields that directly cause the thermally responsive material to change volume and actuate the valve.
Solution Approach 2:
The patent changes the actuation parameter from mechanical pressure (pneumatic) to thermal temperature (thermal). By using temperature as the actuation parameter instead of pressure, the system can achieve valve actuation with much lower power consumption, as the heating elements require significantly less power than pneumatic actuators.
3Ease of operation
If pneumatic valves are used for fluid control, then fluid manipulation is achieved, but portability is reduced due to bulky external equipment
Solution Approach 1:
The patent extracts the bulky external pneumatic equipment (pressure tanks, regulators, solenoid valves) from the system and eliminates them entirely by integrating the actuation function directly into the valve body. This extraction of unnecessary components dramatically reduces the overall system size and improves portability.
Solution Approach 2:
The patent nests the heating elements and thermally responsive materials within the valve body structure itself. The heating elements are embedded in or attached to the valve body, and the thermally responsive material is positioned in the space between the heating element and the fluid passage, creating a compact nested arrangement that minimizes overall device size.
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 power consumption and equipment costs while maintaining high automation capabilities, enabling portable and cost-effective microfluidic systems for applications like point-of-care diagnostics and biological sample preparation.
Implementation Method 1
the planar elastomer layer is placed in a locally expanded state according to the local heating
Implementation Method 2
the resistors are disposed to provide local heating with application of a voltage
Implementation Method 3
the second compression state is a higher pressure than the first compression state
Data Source
AI summary
A fluid valve is provided that includes a first planar substrate having a smooth surface or a surface with features, an elastomer disposed on the first substrate, a second planar substrate disposed on another side of the elastomer, where the second substrate has a smooth surface or features, where the first and second substrate are more rigid than the elastomer, where the first substrate, the second substrate or the elastomer has a fluid channel, where the channel is open when the first or second substrate are in a first thermal state or a first compression state, where the channel is closed or partially closed when the first or second substrate are in a second thermal state or a second compression state, where the second thermal state is a different temperature than the first thermal state, where the second compression state is a different pressure than the first compression state.