Microfluidic Valve Structure With Elastic Latch Flow Control
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Solution Overview
Problem
Microfluidic devices face inefficiencies in valve design, particularly in point-of-care diagnosis devices, where automation from sample injection to outcome detection requires robust and effective fluid control, which is not adequately addressed by existing valve technologies.
Innovation Solution
A microfluidic device and control equipment featuring a valve with a body, a blocking plate, a movable pressing rod, and an elastic latch for precise control of fluid flow, along with a valve operation unit and moving unit for external force application and release, enhancing the actuation and manufacturing simplicity of the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a robust valve structure is implemented to improve fluid control reliability, then the reliability of fluid flow control is improved, but the device complexity increases
Solution Approach 1:
The valve is divided into distinct functional components: a blocking plate for flow control, a pressing rod for actuation, and an elastic latch for positioning. This segmentation allows each component to be optimized independently while maintaining overall reliability without excessive complexity.
Solution Approach 2:
The elastic latch automatically engages with the pressing rod to maintain the valve in its closed position without requiring continuous external force. This self-latching mechanism improves reliability by ensuring consistent flow control while reducing the complexity of external actuation systems.
2Manufacturing precision
If a complex valve structure is used to achieve precise fluid control, then the fluid control precision is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The blocking plate is designed as a thin, flexible element that can be easily manufactured and integrated into the valve body. This flexible plate provides precise flow control through simple deflection when pressed, achieving high manufacturing precision without complex machining or assembly processes.
Solution Approach 2:
The elastic latch replaces complex mechanical locking mechanisms with a simple spring-based engagement system. This substitution maintains precise positioning of the pressing rod while dramatically simplifying the manufacturing process and reducing the number of parts required.
3Ease of manufacture
If a simple valve structure is adopted to improve ease of manufacture, then the ease of manufacture is improved, but the reliability of fluid control deteriorates
Solution Approach 1:
The elastic latch provides automatic self-latching functionality that ensures reliable flow control without requiring complex actuation systems. This self-service mechanism maintains consistent valve positioning and flow control reliability while keeping the overall structure simple and easy to manufacture.
Solution Approach 2:
The elastic latch acts as an intermediary between the pressing rod and the blocking plate, ensuring reliable force transmission and positioning. This intermediary component simplifies the overall structure by eliminating the need for direct mechanical connections while maintaining reliable fluid control.
4Ease of operation
If external actuation mechanisms are added to improve valve operation effectiveness, then the valve operation effectiveness is improved, but the device complexity increases
Solution Approach 1:
The magnetic actuation system replaces complex mechanical linkages with a simple magnetic field-based actuation mechanism. The magnetic element interacts with the pressing rod through magnetic attraction, providing effective valve operation without requiring physical connections or complex mechanical transmission systems.
Solution Approach 2:
The magnetic element serves as an intermediary between the external actuation field and the pressing rod. This intermediary allows effective valve operation through non-contact magnetic forces while keeping the actuation system simple and reducing overall device complexity.
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 improved valve actuation and structure facilitate more effective operation, ease of manufacturing, and convenience in using microfluidic devices, enabling efficient fluid control and integration of complex functions on a single chip.
Implementation Method 1
an elastic latch installed at the side of the body, wherein a front end of the elastic latch elastically protrudes towards inside the body to latch a front end of the pressing rod
Implementation Method 2
a pressing unit that is configured to apply external force to the pressing rod of the valve so that the pressing rod is locked by the elastic latch and fixed
Data Source
AI summary
Provided is a microfluidic device to more easily and effectively operate a valve by improving the structure of valves for controlling a fluid flow more simply and efficiently, which comprises a platform having at least one chamber, at least one flow channel connected to the chambers and transfer fluid, and a valve which opens or closes the flow channel, wherein the valve comprises a body installed in the platform, a blocking plate installed in the body and positioned to face the flow channel to selectively blocks the flow channel, a pressing rod installed to be movable at the inside of the body to press the blocking plate, and a fixing unit installed at the body and fix the pressing rod at a blocking plate pressing position.