Gravity-Driven Microfluidic Detection Unit Without Driving Devices
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Solution Overview
Problem
Conventional microfluidic detection components require driving devices, such as vacuum pumps or pneumatic devices, which can fail and lead to operational issues, and are typically disposable, resulting in high replacement costs and inefficiencies in fluid sample analysis.
Innovation Solution
A microfluidic detection unit that utilizes gravity to drive fluid flow without the need for a driving device, featuring a substrate with fluid injection, storage, and detection sections, where a height difference and capillary forces establish fluid pressure equilibrium, allowing multiple fluid injections and detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving device (vacuum pump, power supply, or pneumatic device) is used to drive fluid motion in conventional microfluidic detection components, then the fluid can be driven to flow through the detection component, but the device complexity increases and the reliability decreases due to potential device failure
Solution Approach 1:
The patent removes the driving device from the microfluidic detection component entirely. The fluid driving function is extracted from the detection component and replaced by gravitational force acting on the fluid itself, eliminating the need for vacuum pumps, power supplies, or pneumatic devices and their associated control systems.
Solution Approach 2:
The fluid sample itself serves as the driving force through its own weight and gravitational potential energy. The height difference between the fluid injection section and storage section creates a self-driven flow system where the fluid moves automatically without external intervention, making the system self-sufficient and more reliable.
2Reliability
If conventional microfluidic detection components are designed as disposable components, then the detection function is ensured, but the loss of substance increases due to frequent replacement and substantial costs increase
Solution Approach 1:
The patent enables recovery and reuse of the microfluidic detection component. By eliminating the need for disposable design and implementing a reusable structure with gravity-driven fluid flow, the component can be cleaned and used multiple times, recovering the investment and reducing waste.
Solution Approach 2:
The detection component is designed to handle multiple fluid samples sequentially through the gravity-driven flow system. The same component can perform multiple detection functions over time, increasing its utility and reducing the need for multiple disposable components.
3Speed
If conventional microfluidic detection components require driving devices, then fluid motion can be controlled, but the ease of operation decreases and inconvenience to users increases due to potential device failure and frequent replacement
Solution Approach 1:
The patent replaces the mechanical driving device system with a gravitational field-based fluid drive system. Instead of using motors, pumps, or pneumatic systems, the fluid motion is controlled by the gravitational force acting on the height difference between sections, simplifying the system and improving ease of operation.
Solution Approach 2:
The system operates automatically using the fluid's own gravitational potential energy. Users simply need to inject the fluid sample, and the system self-regulates the flow through the height difference, eliminating the need for complex control operations and reducing user burden.
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 efficient and cost-effective fluid detection by eliminating the need for driving devices and allowing multiple uses of the detection unit, reducing operational and replacement costs while maintaining detection accuracy.
Implementation Method 1
A height difference is defined between the fluid outlet of the fluid injection section and the fluid inlet of the fluid storage section along a direction of gravity such that the fluid outlet of the fluid injection section has a gravitational potential of greater than that of the fluid inlet of the fluid storage section. When a first fluid is injected from the at least one fluid injection section, the first fluid is driven by gravity to pass through the detection section
Implementation Method 2
a gravitational potential and a capillary force opposite to the direction of gravity of a portion of the first fluid defined from the fluid outlet to a level of the same height as a surface of the droplet are offset to establish a state of fluid pressure equilibrium
Data Source
AI summary
A microfluidic detection unit comprises at least one fluid injection section, a fluid storage section and a detection section. Each fluid injection section defines a fluid outlet; the fluid storage section is in gas communication with the atmosphere and defines a fluid inlet; the detection section defines a first end in communication with the fluid outlet and a second end in communication with the fluid inlet. A height difference is defined between the fluid outlet and the fluid inlet along the direction of gravity. When a first fluid is injected from the at least one fluid injection section, the first fluid is driven by gravity to pass through the detection section and accumulate to form a droplet at the fluid inlet, such that a state of fluid pressure equilibrium of the first fluid is established.