Microfluidic Channel Vortex Design for Rare Cell Capture
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Solution Overview
Problem
Current methods for isolating rare cells, such as circulating tumor cells, from blood samples are inefficient due to their low abundance and fragility, and existing microfluidic chips lack effective designs for capturing these cells.
Innovation Solution
A microfluidic channel with a specific pattern of microstructures and vortex regions is designed, featuring a palindromic arrangement of microstructures that generates vortices to enhance cell binding, where the channel is coated with a non-fouling layer and binding moieties to selectively capture particles of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microstructures are added to capture rare cells, then capture efficiency is improved, but cell damage increases due to mechanical stress
Solution Approach 1:
The patent changes the geometric parameters of microstructures (size, shape, spacing) and flow parameters (velocity, pressure) to optimize capture efficiency while maintaining cell viability. Specific embodiments mention microstructures with controlled dimensions and flow rates that balance capture performance with gentle handling of fragile cells
Solution Approach 2:
The patent applies different microstructure designs to different regions of the channel based on local flow conditions and capture requirements. The microstructure density, size, and configuration vary along the channel length to create optimal capture zones while preserving cell integrity in other regions
2Quantity of substance
If microstructures are densely packed to increase binding sites, then capture capacity is improved, but flow resistance increases
Solution Approach 1:
The patent employs asymmetric microstructure designs where the geometry is optimized to minimize flow resistance while maximizing binding site availability. The asymmetric shapes create favorable flow patterns that reduce pressure drop across the channel while maintaining high capture capacity
Solution Approach 2:
The patent utilizes three-dimensional microstructure configurations that extend binding sites into the vertical dimension, increasing capture capacity without proportionally increasing horizontal blockage. This dimensional approach allows higher binding site density while maintaining adequate flow pathways
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 microfluidic channel effectively increases the binding of rare cells to the microstructures by up to 90% and ensures the viability of released cells, improving the efficiency of rare cell capture and analysis.
Implementation Method 1
a plurality of vortex regions at which one or more vortexes are generated in response to fluid flow
Implementation Method 2
a set of binding moieties configured to selectively bind particles of interest
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The disclosure provides for compositions and methods for the collection of rare cells using an interspersed microstructure design.