MEMS Multi-Stage Filtration for Analyte Separation
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Solution Overview
Problem
Current microfluidic devices face challenges in efficiently filtering and separating specific components from analytes, such as blood, for further analysis, as existing filtration methods are limited in precision and effectiveness.
Innovation Solution
A microelectromechanical system (MEMS) device with a plurality of filters etched into a silicon die, where each filter has holes of specific sizes and shapes to serpentine the analyte, allowing for the separation and purification of different components, which are then directed through cross-flow channels for further analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single filter is used in conventional microfluidic devices, then the device structure is simple, but the filtration precision and separation effectiveness are limited
Solution Approach 1:
The patent divides the filtration function into multiple independent filters (first filter, second filter, third filter) with different pore sizes arranged in sequence. Each filter targets specific component sizes, enabling progressive separation of analyte components from largest to smallest, thereby achieving high precision filtration without requiring a single complex filter structure
Solution Approach 2:
The patent transitions from a single-plane filter arrangement to a multi-layer stacked configuration where filters are positioned at different vertical levels (first layer, second layer, third layer). This three-dimensional arrangement allows multiple filtration stages within a compact footprint, increasing separation effectiveness while maintaining device compactness
2Reliability
If conventional filtration methods are used, then the device is easy to manufacture, but the separation effectiveness and purification quality are insufficient
Solution Approach 1:
The filtration process is segmented into multiple sequential stages, each handled by a dedicated filter with specific pore size characteristics. This modular segmentation allows each filter to be optimized for its specific separation task while maintaining overall manufacturing feasibility through standardized filter component design
Solution Approach 2:
The patent implements a nested filtration architecture where smaller-pore filters are positioned within or between larger-pore filters in a hierarchical arrangement. The first filter (largest pores) captures largest components, the second filter (intermediate pores) captures medium components, and the third filter (smallest pores) captures smallest components, creating a nested separation system that enhances purification while managing manufacturing complexity
3Manufacturing precision
If filters with small pore sizes are used to improve filtration precision, then the separation quality improves, but clogging issues increase
Solution Approach 1:
The patent segments the filtration load across multiple filters with progressively smaller pore sizes. By distributing the filtration task, each filter handles only the size range appropriate to its pore size, preventing any single small-pore filter from becoming overwhelmed and clogged by all particle types simultaneously
Solution Approach 2:
The filtration system performs preliminary separation at each stage before proceeding to the next. Larger components are removed first by the first filter, preventing them from reaching and clogging subsequent smaller-pore filters. This preliminary action at each stage protects downstream filters from premature clogging, maintaining system reliability
4Reliability
If multiple filters are added to improve separation effectiveness, then the purification quality improves, but the device size increases
Solution Approach 1:
The patent resolves the space constraint by stacking filters vertically in multiple layers rather than arranging them horizontally in sequence. This three-dimensional configuration allows three or more filters to occupy a compact footprint area while maintaining the required separation stages, effectively decoupling purification quality from device footprint
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 MEMS device enables precise filtration and purification of analyte components, allowing for more effective analysis of individual components, reducing clogging issues and enhancing the efficiency of diagnostic processes.
Implementation Method 1
A plurality of filters may be defined in a die... each filter filtering out a specific size and/or type of component in the analyte
Data Source
AI summary
A method may include etching a number of holes into a carrier wafer layer to form a plurality of filters in the carrier wafer layer, patterning a chamber layer over a first side of the carrier wafer layer to form chambers above each filter formed in the carrier wafer layer, forming a layer over the chamber layer, grinding a second side of the carrier wafer layer to expose the number of holes etched into the carrier wafer layer, and bonding a molded substrate to the carrier wafer layer opposite the chamber layer.