Dielectric Cytometry for Cell Sorting Without Optical Labeling
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Solution Overview
Problem
Current flow cytometers relying on optical analysis methods alter cell states through labeling, posing safety concerns for re-implantation in regenerative medical care, and electrical analysis methods using Coulter counters provide limited data for sorting different cell types without optical methods.
Innovation Solution
A dielectric cytometric apparatus employing a flow channel with a stenosis channel and branch channels, utilizing AC voltage to generate an electric field for measuring complex dielectric constants and applying dielectrophoretic forces for cell sorting without optical labeling, enabling electrical analysis and sorting of cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical analysis methods with fluorescent labeling are used in flow cytometry, then cell type identification capability is improved, but cell state alteration and safety concerns for re-implantation occur
Solution Approach 1:
The patent replaces optical analysis methods with electrical analysis methods. Specifically, it uses dielectric cytometry to measure complex dielectric constants of cells through electrical impedance measurements, substituting the mechanical/optical labeling process with an electrical field-based measurement system that does not alter cell state
Solution Approach 2:
The patent changes the measurement parameter from optical properties (fluorescence intensity) to electrical properties (complex dielectric constant). By measuring electrical impedance at multiple frequencies and calculating complex dielectric constants, the system achieves cell type identification without optical labeling that alters cell state
2Productivity
If electrical analysis methods using Coulter counters are used, then cell counting is improved, but cell sorting capability for different cell types is limited
Solution Approach 1:
The patent segments the electrical analysis into multiple frequency measurements. By measuring complex dielectric constants at multiple frequencies (not just a single frequency), the system creates detailed electrical fingerprints for different cell types, enabling both accurate counting and sophisticated sorting capabilities
Solution Approach 2:
The patent adds the frequency dimension to electrical measurements. Instead of single-frequency impedance measurements, it measures across multiple frequencies and calculates complex dielectric constants, creating a multi-dimensional electrical characterization space that enables differentiation and sorting of various cell types
3Loss of information
If fluorescent labeling antibodies are joined to surface antigen molecules, then cell type characterization is improved, but cell safety for re-implantation is compromised
Solution Approach 1:
The patent substitutes chemical labeling (joining fluorescent antibodies to surface antigens) with physical electrical measurement. It measures the intrinsic electrical properties of cells through dielectric cytometry, obtaining cell type characterization information without introducing foreign molecules that could compromise cell safety
Solution Approach 2:
The patent uses the cell's own intrinsic electrical properties for characterization. By measuring complex dielectric constants that reflect the cell's natural membrane and internal structure, the system obtains characterization information without requiring external labeling agents
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 the analysis and sorting of cells while maintaining their original state, providing detailed electrical characterization and effective separation of cell types without the need for optical labeling, enhancing safety and accuracy in regenerative medical applications.
Implementation Method 1
a first electrode pair capable of generating an AC electric field on the stenosis channel by application of an AC voltage
Implementation Method 2
measuring a complex dielectric constant depending on the cell for each of the cells each flowing through the stenosis channel
Implementation Method 3
applying, on the basis of the complex dielectric constant measured by the analysis unit, a dielectrophoretic force to the cells by a second electrode pair
Data Source
AI summary
Disclosed herein is a dielectric cytometric apparatus capable of analyzing cells and sorting the cells without adopting an optical analysis method and provides a dielectric cytometric cell sorting method for the apparatus. A stenosis channel allowing a single cell to flow is created on a cell injection section of a micro flow channel device used as a portion of the dielectric cytometric apparatus. A pair of measurement electrodes is created on the stenosis channel and an analyzer connected to the measurement electrodes measures the complex dielectric constant of for every cell passing through the stenosis channel. A electric-field application section provided on the downstream side of the stenosis channel applies an electric field for changing the flow of the cells inside a flow channel on the basis of information on the measured complex dielectric constants so that the cells can be sorted by making use of branch channels.