Dual-Filter Microfluidic Device for Single Cell Dissociation
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Solution Overview
Problem
Existing microfluidic devices struggle to completely dissociate tissue samples into single cells, as small aggregates and clusters often remain, limiting the quality of single cell suspensions and hindering downstream analysis.
Innovation Solution
A microfluidic tissue dissociation and filtration device is designed with a dual-filter membrane system, where a first filter membrane with larger pores (25-50 μm) is followed by a second filter membrane with smaller pores (10-15 μm), enhancing the dissociation of aggregates into single cells while maintaining cell viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single cell strainer with large pores (35-80 μm) is used to remove tissue fragments, then large tissue fragments are removed, but small aggregates and clusters pass through along with single cells
Solution Approach 1:
The filtration system is segmented into multiple stages with different pore sizes. The first filter membrane (35-80 μm) removes large tissue fragments, while the second filter membrane (5-15 μm) removes small aggregates. This multi-stage segmentation allows each filter to specialize in removing a specific size range, thereby achieving both high single cell yield and high single cell purity simultaneously.
2Manufacturing precision
If cell strainers with smaller pore sizes are used to remove small aggregates, then single cell purity is improved, but single cells are lost
Solution Approach 1:
The filtration process is divided into two sequential stages: first filtering with larger pores (35-80 μm) to remove tissue fragments while preserving single cells, then filtering with smaller pores (5-15 μm) to remove aggregates. This segmentation ensures that no single filter needs to have pores small enough to catch all aggregates, thus avoiding single cell loss while still achieving high purity.
Solution Approach 2:
Different regions of the filtration system have different pore sizes optimized for their specific function. The first filter membrane has larger pores suitable for removing large fragments, while the second filter membrane has smaller pores suitable for removing small aggregates. This local optimization of pore size in different parts of the system allows each filter to perform its specific function effectively without compromising single cell recovery.
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 dual-filter membrane system significantly increases single cell yield by at least 3-fold, and in some cases by over 10-fold, while maintaining cell viability and reducing aggregates, thereby improving the quality of single cell suspensions.
Implementation Method 1
a first filter membrane with larger pores (25-50 μm) is followed by a second filter membrane with smaller pores (10-15 μm), enhancing the dissociation of aggregates into single cells
Implementation Method 2
a first filter membrane with larger pores (25-50 μm) is followed by a second filter membrane with smaller pores (10-15 μm), enhancing the dissociation of aggregates into single cells
Data Source
AI summary
A microfluidic tissue dissociation and filtration device simultaneously filters large tissue fragments and dissociates smaller aggregates into single cells, thereby improving single cell yield and purity. The device includes an inlet coupled to a first microfluidic channel at an upstream location and a first outlet at a downstream location. A first filter membrane is interposed between the first microfluidic channel and a second microfluidic channel, wherein the second microfluidic channel is in fluidic communication with the first microfluidic channel via the first filter membrane. The first filter membrane operates under a tangential flow format. A second outlet is coupled to a downstream location of the second microfluidic channel and includes a second filter membrane interposed between the second outlet and the second microfluidic channel. The dual membrane device increased single cell numbers by at least 3-fold for different tissue types.