Phase Change Valve Unit for Repeated Microchannel Control
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Solution Overview
Problem
Conventional microfluidic valve units can only open or close microchannels but not repeatedly, leading to bulky and costly substrates with complex fluid reaction capabilities.
Innovation Solution
A valve unit utilizing a phase change material that is non-fluidic at ambient temperature but becomes fluidic with energy application, allowing it to block and unblock microchannels through a valve connection path and drain chambers, controlled by an external energy source like a laser light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional open valve units or close valve units are used, then microchannels can be opened or closed, but the substrate becomes bulky and complex since multiple valve units are needed to achieve repeated opening and closing
Solution Approach 1:
The patent combines both open valve and close valve functionalities into a single integrated valve unit. The valve unit includes a valve element that can be positioned in different states: when moved toward the inlet, it blocks the inlet (close function); when moved toward the outlet, it blocks the outlet (open function). This merging of functions into one unit eliminates the need for separate open and close valve units, thereby reducing substrate complexity while maintaining full valve adaptability.
Solution Approach 2:
The single valve unit is designed to perform multiple functions: it can close the microchannel by blocking the inlet, open the microchannel by blocking the outlet, and maintain flow in either direction. This multi-functional design allows one valve unit to replace what would traditionally require multiple specialized valve units, reducing the overall device complexity while preserving complete valve functionality for complex fluid reactions.
2Adaptability or versatility
If multiple open valve units and close valve units are included in the substrate, then complex fluid reactions can be controlled, but the manufacturing process becomes expensive and time-consuming
Solution Approach 1:
By merging multiple valve functions into a single valve unit, the number of components that need to be manufactured and assembled is reduced. The substrate requires fewer valve units, connection paths, and associated structures, which directly simplifies the manufacturing process and reduces production time and costs while still enabling complex fluid reaction control through the multi-functional valve.
Solution Approach 2:
The universal valve unit design allows a single component to perform the work of multiple specialized valve units. This reduces the bill of materials and assembly steps required for substrate manufacturing, making the production process more economical and efficient while maintaining the capability to control complex fluid reactions through coordinated operation of the multi-functional valves.
3Volume of stationary object
If a valve unit can repeatedly open and close microchannels, then substrate size can be reduced, but the valve mechanism becomes more complex
Solution Approach 1:
The valve mechanism combines the open and close functions into a single integrated structure with one movable valve element. This element can be actuated to achieve both closing (by blocking the inlet) and opening (by blocking the outlet) functions. By merging these functions into one mechanism rather than using separate mechanisms, the overall valve complexity is reduced while enabling repeated opening and closing operations in a compact form factor.
Solution Approach 2:
The valve operates by inverting the traditional approach: instead of having separate mechanisms that add or remove blocking elements, a single blocking element is moved to different positions. When the valve element is at the inlet side, it closes the channel; when moved to the outlet side, it opens the channel by blocking the outlet instead. This inverted logic simplifies the mechanism while enabling repeated operations in a compact design.
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
Enables the repeated opening and closing of microchannels, reducing substrate complexity and manufacturing costs, allowing for compact and efficient fluid handling in microfluidic devices.
Implementation Method 1
a valve substance including a phase change material that is non-fluidic at ambient temperature and fluidic when energy is applied thereto
Implementation Method 2
When it is necessary to move the fluid (F), heat (H) is applied to the paraffin wax 20 to melt the paraffin wax 20
Data Source
AI summary
Provided are a valve unit and a microfluidic device including the valve unit. The valve unit includes: a valve substance container containing a valve substance, the valve substance including a phase change material that is solid at ambient temperature and melts by absorbing energy; a valve connection path connecting the valve substance container to a channel forming a fluid passage; and a pair of drain chambers formed along the channel at both sides of the valve connection path.