Thermopneumatic Capillary Micropump Design
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Solution Overview
Problem
Traditional thermopneumatic micropumps are complex and costly to manufacture, requiring intricate structures and driving films, and existing systems for analyzing fine fluids are expensive, large, inefficient, and often require lengthy analysis times, posing risks in hazardous environments.
Innovation Solution
A thermopneumatic capillary micropump design that includes a lower substrate with micro-heaters and electrodes, air chambers, and a pump chamber unit, where the micro-heaters generate heat to expand air and push fluids through a capillary tube, with an airing channel maintaining air pressure, allowing for a less complex and cost-effective manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional thermopneumatic micropump structures are used with driving thin films and check valves, then pumping function is achieved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent removes the driving thin film and check valve components from the traditional thermopneumatic micropump structure. By extracting these complex elements, the invention achieves pumping functionality through a simpler capillary-based mechanism, directly resolving the contradiction between manufacturing ease and device complexity
Solution Approach 2:
The patent replaces the mechanical driving thin film and valve system with a thermocapillary-based pumping mechanism. This substitution eliminates moving parts and complex mechanical structures, enabling manufacturing without the need for precise thin film deposition and valve assembly
2Volume of moving object
If conventional analysis systems are used for fluid analysis, then analysis capability is provided, but system size and cost increase
Solution Approach 1:
The patent integrates the micropump, reaction chambers, and detection components into a single miniaturized chip structure. This nesting approach allows the complete analysis system to be contained within a small volume while maintaining full analytical functionality, resolving the contradiction between system size and analysis efficiency
Solution Approach 2:
The patent combines multiple functions (pumping, mixing, reaction, and detection) into a single integrated microfluidic chip. This merging of functions eliminates the need for separate large-scale equipment, achieving both compact size and efficient analysis capability
3Ease of manufacture
If traditional micropump structures with multiple components are used, then pumping capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent divides the micropump into simple, manufacturable components (substrate, capillary channels, heating elements) that can be fabricated using standard microfabrication techniques. This segmentation allows for cost-effective manufacturing while maintaining reliable pumping function through the robust capillary structure
Solution Approach 2:
The patent employs a disposable microfluidic chip design where the entire pumping and analysis system is integrated into a single low-cost, replaceable unit. This approach reduces manufacturing costs by using simple materials and structures while ensuring reliability through consistent factory assembly and quality 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 micropump achieves efficient control of extremely fine fluids, reducing manufacturing complexity and cost, enabling real-time analysis in portable systems, minimizing risks in hazardous environments, and providing accurate flow of microliters or nanoliters without the need for moving structures or valves.
Implementation Method 1
one or more micro-heaters for generating heat
Implementation Method 2
the micro-heaters generate heat to expand air and push fluids through a capillary tube
Implementation Method 3
thermopneumatic capillary micropump
Data Source
AI summary
According to various aspects, exemplary embodiments are provided of thermopneumatic capillary micropumps and manufacturing methods thereof. In one exemplary embodiment, a thermopneumatic capillary micropump generally includes a lower substrate having a pump-entrance for injecting fluids and a pump-exit for exhausting the fluids. The micropump also includes one or more micro-heaters for generating heat and electrodes for applying voltage to the micro-heaters. One or more air chambers substantially cover the micro-heaters. A pump chamber unit, which is capable of being filled up with the fluids, is coupled to the air chambers, the pump-entrance, and the pump-exit. An airing channel is coupled to the air chambers for helping maintain the pressure of the air in the air chambers at about the same level. An oxide layer is deposited on an upper substrate of the micropump. The upper and lower substrates are thermopneumatically coupled to each other.