Microfluidic Diaphragm Pump for Immunoassay Automation
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Solution Overview
Problem
Microfluidic devices for immunoassays require external pumps and valves for operation, which complicates the automation of process steps and limits the efficiency of fluid interaction with detection elements.
Innovation Solution
A microfluidic device with fluidically connected chambers and a diaphragm that allows for the complete filling of a third chamber with a second fluid, enabling exclusive contact with a detection element, and includes features like restrictors and valves to control pressure and fluid displacement for efficient interaction and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If external pumps and valves are used to operate microfluidic devices, then fluid transport and process automation are enabled, but device complexity increases
Solution Approach 1:
The invention extracts the pump function from external components and integrates it into the device itself through the diaphragm mechanism. The diaphragm, when actuated, directly displaces fluid between chambers without requiring external pumps, thereby reducing device complexity while maintaining automation capability
Solution Approach 2:
The device performs self-pumping through the diaphragm's mechanical displacement action. The system uses internally stored pressure (from the first chamber) to drive fluid movement through the sequence of chambers, eliminating the need for external power sources or control systems for pumping
2Reliability
If the third chamber is completely filled with the second fluid, then interaction effectiveness with the detection element is improved, but control over fluid displacement becomes more difficult
Solution Approach 1:
The fluid transport system is segmented into multiple chambers (first, second, third, and fourth chambers) that work in sequence. This segmentation allows controlled displacement of fluids through defined pathways, ensuring complete filling of the third chamber while maintaining operational control through the staged chamber design
Solution Approach 2:
The diaphragm acts as an intermediary mechanism between the first chamber (pressure source) and the third chamber (detection chamber). It mediates the fluid displacement process by translating pressure into controlled volume transfer, ensuring complete filling without direct complex control mechanisms
3Loss of substance
If pressure is applied to displace fluid through multiple chambers, then complete fluid replacement and cleaning are achieved, but the process time increases
Solution Approach 1:
The device prepares the fluid displacement pathway in advance through the configured chamber system and diaphragm mechanism. The sequential chamber arrangement is pre-designed to enable efficient fluid replacement, allowing complete cleaning to be achieved quickly when pressure is applied, rather than requiring gradual or complex multi-step flushing procedures
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 device achieves high effectiveness in fluid interaction with detection elements and allows for automated, efficient immunoassay processes, including complete filling and cleaning of chambers, simplifying operation and enabling reuse with modular design.
Implementation Method 1
the deflection of the diaphragm is carried out by applying pressure to the diaphragm via the first fluidic feed line
Implementation Method 2
a first fluid is led at least partly out of the first chamber into the second chamber in such a way that a second fluid is at least partly displaced out of the second chamber into the third chamber
Data Source
AI summary
A device, especially a microfluidic device for performance of an immunoassay, has a first, a second and a third fluidically connected chamber and a membrane. In the event of a given deflection of the membrane into the first chamber, a first fluid is passed at least partly out of the first chamber into the second chamber in such a way that a second fluid is at least partly displaced from the second chamber into the third chamber in such a way that the third chamber is entirely filled with the second fluid.