Meander Flow Cell for Rare Cell Enrichment
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Solution Overview
Problem
Current microfluidic systems for detecting rare cells in fluids, such as circulating tumor cells in blood, face challenges including low capture efficiency due to lack of mixing and unspecific cell binding, long separation times, and interference with automated optical detection, limiting their effectiveness and scalability.
Innovation Solution
A novel microfluidic flow cell with a meander-shaped flow channel design that reverses fluid flow direction multiple times, combined with a hydrogel-coated surface for enhanced cell interaction, and a filtration system to remove interfering cells, improving cell-surface contact and capture efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cells are conducted through microfluidic flow cells with laminar flow, then the system is simple to operate, but the lack of mixing reduces cell-surface interactions and capture efficiency
Solution Approach 1:
The patent introduces meander-shaped flow channels with curved paths instead of straight channels, creating helical convection patterns that enhance mixing and cell-surface interactions while maintaining laminar flow conditions and operational simplicity
Solution Approach 2:
The patent employs barrier elements and meander structures that induce flow oscillations and helical convection, creating dynamic mixing effects within the laminar flow regime to improve capture efficiency without complicating operation
2Productivity
If barrier elements are added to microchannels to improve mixing, then cell-surface interactions increase, but the device complexity increases
Solution Approach 1:
The meander-shaped channel design uses curved geometry to generate helical convection patterns, achieving enhanced mixing and cell-surface interactions through flow path design rather than adding complex barrier elements
Solution Approach 2:
The patent uses the hydraulic properties of laminar flow itself, leveraging the velocity profile and pressure gradients to generate helical convection through meander channels, avoiding the need for additional mechanical mixing components
3Device complexity
If conventional microfluidic systems are used for cell detection, then the system is simple, but unspecific cell binding occurs and reduces reliability
Solution Approach 1:
The patent applies derivatization with affinity molecules to specific local regions of the flow channel surfaces, creating zones of high selectivity where target cells are captured while maintaining overall system simplicity
Solution Approach 2:
The meander-shaped channels enhance selectivity by increasing the path length and number of interactions between cells and derivatized surfaces, allowing more opportunities for specific binding events to occur
4Productivity
If longer separation times are used to improve capture efficiency, then more cells are captured, but the processing time increases
Solution Approach 1:
The meander-shaped channels with helical convection patterns enhance mixing and cell-surface interactions, achieving high capture efficiency in shorter times by improving the effectiveness of each interaction event
Solution Approach 2:
The continuous meander pattern ensures that cells repeatedly encounter derivatized surfaces throughout their passage, maintaining continuous capture opportunities without requiring extended separation times
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 design significantly enhances the yield of target cells by promoting helical convection and increasing cell-surface interactions, achieving high recovery rates of up to 96% while allowing for efficient optical detection and processing of larger sample volumes.
Implementation Method 1
The design significantly enhances the yield of target cells by promoting helical convection and increasing cell-surface interactions
Implementation Method 2
combined with a hydrogel-coated surface for enhanced cell interaction
Data Source
AI summary
The present invention relates to the field of micro fluidics. Specifically, the present invention relates to a novel flow cell for the selective enrichment of target particles or cells from a fluid. The flow cell exhibits a novel design which greatly improves the target particle or cell yield. The invention also provides a micro fluidic device, comprising the flow cell according to the invention. In another aspect, the invention relates to the use of a flow cell or a micro fluidic device of the invention for the isolation of target particles or cells from a fluid sample. Finally, the invention relates to a method for the selective enrichment of target particles or cells from a fluid using the flow cell of the invention.