Porous Filtering Medium Compression for Microfluidic Liquid Extraction
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Solution Overview
Problem
Current microfluidic devices face challenges in efficiently processing filtered liquids, particularly in separating red blood cells from blood samples for diagnostic tests, as existing methods either separate filtration from analysis or require complex fabrication processes, leading to variability in biomarker detection and potential hemolysis issues.
Innovation Solution
A method involving a porous filtering medium positioned with respect to a microfluidic device, allowing a flow path for filtered liquid extraction, where compression is applied to extract a defined volume of filtered liquid, which is then processed using the microfluidic device, enabling efficient removal of red blood cells without complex peripherals or timing constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a porous filtering medium is positioned with respect to a microfluidic device to allow flow path between them, then the liquid can be filtered and extracted efficiently, but the device complexity increases due to the need for positioning and compression mechanisms
Solution Approach 1:
The patent combines the filtration function and microfluidic processing function into a single integrated device. The porous filtering medium is positioned directly against the microfluidic device such that the outlet of the filtering medium is in direct contact with the inlet of the microfluidic device, eliminating the need for separate positioning and compression mechanisms while maintaining efficient liquid extraction and processing.
2Manufacturing precision
If compression is applied to the filtering medium to extract a given volume of filtered liquid, then the liquid extraction volume is controlled precisely, but the device complexity increases due to the compression mechanism
Solution Approach 1:
The filtering medium is designed to be compressible and positioned such that applying compression to the filtering medium automatically extracts the filtered liquid into the microfluidic device inlet. The system uses the compression action itself to drive the liquid transfer without requiring additional pumps or complex volume control mechanisms, achieving precise volume extraction through the inherent properties of the compressible filtering medium.
3Reliability
If the filtering medium is integrated with the microfluidic device, then the fabrication process becomes more complex, but the overall device performance improves
Solution Approach 1:
The device is segmented into two functional modules: a compression module containing the porous filtering medium and a microfluidic processing module. These modules are positioned adjacent to each other with direct contact between the filtering medium outlet and microfluidic device inlet, allowing independent fabrication and optimization of each module while maintaining reliable integrated performance for biomarker detection.
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
This approach allows for precise and efficient processing of filtered liquids, reducing variability in biomarker detection and preventing hemolysis, thereby improving the accuracy of diagnostic tests by effectively removing red blood cells without adding complexity to the microfluidic device's fabrication or operation.
Implementation Method 1
introducing a liquid in the porous filtering medium for the liquid to advance along the filtering medium and be filtered by the medium
Implementation Method 2
applying compression to the filtering medium to extract a given volume of the filtered liquid from the filtering medium, where the extracted liquid volume reaches said channel via the flow path
Data Source
AI summary
According to a first aspect, the present invention is embodied as a method of processing a filtered liquid with a microfluidic device. The method includes positioning a porous filtering medium with respect to the microfluidic device, so as to allow a flow path between the filtering medium and a channel of the microfluidic device. The method further includes introducing a liquid in the porous filtering medium for the liquid to advance along the filtering medium and be filtered by the medium. The method further includes applying compression to the filtering medium to extract a given volume of the filtered liquid from the filtering medium, where the extracted liquid volume reaches said channel via the flow path. The method further includes processing the extracted volume with the microfluidic device.