Multiplexed On-Chip Impedance Cytometry for Rare Cell Analysis
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Solution Overview
Problem
Current methods for characterizing phenotypic heterogeneity in cells, such as flow cytometry, require large sample sizes and are limited by high shear stress, intermittent analysis, and the need for multiple preparation steps, which are not suitable for rare stem cells or tumor samples, and do not allow for real-time monitoring of therapeutic targets.
Innovation Solution
A microfluidic system for multiplexed single-cell impedance cytometry that integrates impedance-based quantification on a chip, enabling continuous separation and analysis of cells without additional sample handling, using electric fields to separate cells based on impedance characteristics and quantify subcellular features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flow cytometry methods are used to characterize phenotypic heterogeneity, then rapid analysis of single cells is achieved, but large sample sizes are required that are not available with rare stem cells or tumor samples
Solution Approach 1:
The patent replaces traditional flow cytometry mechanical systems with acoustic wave-based manipulation. Acoustic standing waves are used to focus and position cells in a microfluidic channel, enabling single-cell analysis with minimal sample consumption. This substitution allows rare cells to be analyzed without requiring large sample volumes while maintaining high analysis throughput.
2Measurement precision
If flow cytometry is applied as endpoint assays, then phenotypic characterization is achieved, but the ability to use the analyzed sample within transplant therapies is lost
Solution Approach 1:
The patent implements continuous flow analysis where cells are analyzed in real-time while maintaining their viability. The gentle acoustic manipulation and microfluidic environment preserve cell integrity throughout the analysis process, allowing the same sample to be used for both phenotypic characterization and subsequent therapeutic applications without endpoint destruction.
3Measurement precision
If flow cytometry involves multiple sample preparation steps, then cell analysis is achieved, but time is consumed and cells are subjected to additional stress
Solution Approach 1:
The patent combines multiple functions into a single integrated microfluidic device. Cell focusing, acoustic manipulation, impedance measurement, and data acquisition are all performed within one continuous flow system without intermediate handling steps. This merging eliminates time-consuming preparation steps while reducing mechanical stress on cells through gentle, continuous flow conditions.
4Measurement precision
If single-cell electrophysiology measurements are obtained at low throughput, then detailed phenotypic information is achieved, but statistically relevant information on cellular heterogeneity cannot be obtained
Solution Approach 1:
The patent performs preliminary acoustic focusing of cells into a single-file stream before measurement. This pre-positioning ensures that each cell passes through the detection zone in a controlled manner, enabling rapid sequential measurement without sacrificing measurement quality. The preliminary organization of cells allows high-throughput analysis while maintaining detailed phenotypic information for each individual cell.
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
This approach allows for high-throughput, real-time characterization of cell phenotypes with minimal sample requirements, reducing stress on cells and enabling continuous analysis of therapeutic targets, thereby improving the assessment of drug resistance and disease onset in stem cells and tumor cells.
Implementation Method 1
applying a first set of electric field (e.g., non-uniform electric field, e.g., via dielectrophoresis) across a first set of one or more electrodes located in the upstream microfluidic channel to selectively urge the biologic or particle components into one or more lanes of a plurality of lanes in a flow to continuously separate the biologic or particle components
Implementation Method 2
applying a first set of electric field (e.g., non-uniform electric field, e.g., via dielectrophoresis) across a first set of one or more electrodes located in the upstream microfluidic channel to selectively urge the biologic or particle components into one or more lanes
Implementation Method 3
interrogating, via the second set of one or more electrodes, electrical responses of the separated biologic or particle components in the at least one downstream microfluidic channel, including electrical responses of the separated biologic or particle components in the first downstream microfluidic channel
Data Source
AI summary
An exemplary method and system is disclosed that facilitate the integration of multiplexed single-cell impedance cytometry in a high throughput format, which can be deployed upstream from microfluidic sample preparation and/or downstream to microfluidic cell separation. In exemplary method and system may employ impedance-based quantification of cell electrophysiology on the same microfluidic chip (i.e., “on-chip”) to provide distinguishing phenotypic information on the sample, without the need for additional sample handling, preparation or dilution steps as would be needed for other flow cytometry techniques.