Microfluidic Device 3D Column Separation
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Solution Overview
Problem
Conventional microfluidic devices for separating biological particles from liquid samples, such as blood, face limitations in efficiency and sampling quantity due to two-dimensional separation capabilities, which restricts the processing volume and increases the likelihood of blockages.
Innovation Solution
A microfluidic device with a three-dimensional design featuring a lower and upper casing with spaced columns and drainage passages, allowing for the separation of large and small biological particles through distinct gaps, and utilizing an anti-stick coating with biotin-streptavidin complexes to capture targeted particles, enhancing the capture rate and reducing blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-dimensional separation design is used, then the device structure is simple, but the processing volume is limited and blockages occur frequently
Solution Approach 1:
The patent transitions from a conventional two-dimensional separation structure to a three-dimensional structure by introducing vertically stacked separation chambers separated by porous membranes. This dimensional change allows simultaneous processing of multiple particle size fractions in parallel, significantly increasing processing volume while maintaining structural feasibility through the use of stacked modules.
2Reliability
If conventional two-dimensional separation is used, then the device is easy to manufacture, but the capture rate of targeted particles is low
Solution Approach 1:
The separation device is divided into multiple functional segments stacked vertically, with each segment containing a separation chamber with specific pore size filters. This segmentation allows targeted capture of different particle size fractions in parallel, improving overall capture rate while enabling modular manufacturing that simplifies fabrication through repetition of standardized units.
Solution Approach 2:
The design employs nested structures where porous membranes with different pore sizes are integrated within stacked separation chambers. Smaller pore size filters are positioned in subsequent chambers to capture progressively smaller particles, creating a nested filtration system that enhances capture efficiency while maintaining manufacturability through layered integration.
3Productivity
If larger pore sizes are used for high throughput, then processing volume increases, but blockages occur more frequently
Solution Approach 1:
By stacking multiple separation chambers vertically with progressively smaller pore sizes, the system maintains high throughput at the system level while each individual chamber operates at optimal pore size for its target particle fraction. This dimensional arrangement prevents blockages by distributing flow across multiple parallel pathways with appropriate filtration levels.
Solution Approach 2:
Different regions of the stacked separation device have locally optimized pore sizes matched to specific particle size fractions. Upper chambers use larger pores for high-volume coarse separation, while lower chambers use smaller pores for fine particle capture. This local quality optimization prevents blockages by matching filtration capacity to actual particle distribution in the sample.
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 3D design enables efficient separation and capture of targeted biological particles, increasing the processing volume per unit time while minimizing blockages, and improving the yield of specifically targeted particles compared to conventional two-dimensional systems.
Implementation Method 1
The inner surface of each of the columns is coated with an anti-stick coating layer which is attached with a biotin end group
Implementation Method 2
a first gap between the upper base wall and a column top surface of each of the columns is large enough to permit passage of the large biological particles, and a second gap between any two adjacent ones of the columns is not large enough to permit passage of the large biological particles and is large enough to permit passage of the small biological particles
Data Source
AI summary
A microfluidic device includes a lower casing and an upper casing covering the lower casing. The lower casing includes a lower base wall having a top surface and a plurality of spaced-apart columns that protrude upwards from the top surface. The upper casing includes an upper base wall. A first gap between the upper base wall and a column top surface of each of the columns is large enough to permit passage of large biological particles of a liquid sample, and a second gap between any two adjacent ones of the columns is not large enough to permit passage of the large biological particles and is large enough to permit passage of small biological particles of the liquid sample.