Microfluidic Cell Sorting via Flow-Induced Deformation Analysis
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Solution Overview
Problem
Existing methods for determining the mechanical properties of cells are time-consuming, limiting their application in dynamic biological studies and large-scale cell analysis, particularly in screening procedures where real-time analysis and sorting based on mechanical properties are necessary.
Innovation Solution
A microfluidic apparatus with a channel configured for laminar flow, allowing for real-time analysis and sorting of cells as they pass through, using a cell shape measurement device and analysis means to determine mechanical properties based on deformation caused by fluid flow, independent of cell size and type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods (optical stretcher, AFM, micropipette aspiration) are used to determine mechanical properties of cells, then measurement precision is achieved, but productivity is too low (about 100 cells per hour)
Solution Approach 1:
The patent replaces mechanical measurement systems (AFM cantilevers, micropipettes, optical traps) with a microfluidic flow-based system. Cells are deformed by controlled fluid flow through a microchannel, and mechanical properties are determined by analyzing cell deformation and relaxation dynamics. This substitution enables high-throughput automated measurement while maintaining measurement capability.
Solution Approach 2:
The measurement process is segmented into distinct phases: cell introduction into microchannel, deformation by controlled flow, imaging during flow, and relaxation after flow cessation. This segmentation allows for automated sequential processing of multiple cells, significantly increasing throughput from 100 cells/hour to potentially thousands of cells per hour.
2Measurement precision
If manual evaluation of cell deformation is performed, then measurement precision can be maintained, but loss of time increases due to tedious and user-biased analysis
Solution Approach 1:
The patent replaces manual visual evaluation with automated image processing and analysis software. Cell deformation is quantified by analyzing images captured during flow and comparing them to reference images. This automated approach eliminates user bias, reduces analysis time from minutes per cell to seconds, and maintains or improves measurement precision through consistent algorithmic evaluation.
Solution Approach 2:
The system creates digital copies (images) of cells at different deformation states and uses computational algorithms to analyze these copies. This allows for rapid, objective comparison of cell shapes without manual intervention, significantly reducing analysis time while maintaining measurement accuracy through standardized processing protocols.
3Measurement precision
If cells are trapped in optical traps for measurement, then mechanical properties can be determined, but device complexity increases and ease of operation decreases
Solution Approach 1:
The patent replaces complex optical trapping systems (requiring high-power lasers, precise alignment, and stable mounting) with a simple microfluidic flow system. Cells are naturally carried through the microchannel by fluid flow, eliminating the need for active trapping mechanisms. This dramatically simplifies the apparatus, reduces operational complexity, and makes the system easier to use while maintaining the ability to measure mechanical properties through flow-induced deformation.
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
Enables rapid determination and sorting of cell mechanical properties in real-time, significantly increasing throughput and allowing for the analysis of large cell populations, facilitating dynamic biological studies and screening processes.
Implementation Method 1
The forces originate either from a non-zero shear rate of the medium—which causes tangential shear forces—or from inertial momentum transfer—causing forces normal to the object's surface.
Implementation Method 2
The forces originate either from a non-zero shear rate of the medium—which causes tangential shear forces
Implementation Method 3
a cell shape measurement device arranged to obtain information of a shape of a cell deformed due to the flow pattern
Data Source
AI summary
The present invention relates to a method and an apparatus for sorting cells. The apparatus for determining the mechanical properties of cells comprises: —a microfluidic channel having an inlet and an outlet, the channel being configured to let a fluid containing cells pass therethrough, —a means for introducing a fluid containing cells into the channel so as to establish a flow of the fluid within the channel, —a cell shape measurement device arranged to obtain information of a deformed shape of a cell deformed due to the flow pattern created by the interaction of the fluid flow with the channel, and —an analysis means arranged to use data from the cell shape measurement device to obtain mechanical properties of the cells.