Microfluidic Cell Sorting via Electrical Field Potential Sensing
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Solution Overview
Problem
Current methods for stem cell sorting, particularly for iPSCs, are error-prone, time-consuming, and labor-intensive, and lack the ability to sort multiple cell phenotypes effectively, while existing techniques for isolating circulating tumor cells are inefficient due to their low concentration and require exogenous labeling or genetic modification, which is not suitable for clinical applications.
Innovation Solution
The development of 'On-the-Fly Field-Potential Sensing Electrode Track' (OFFSET) technology for high-throughput label-free sorting of stem cells and their differentiated progeny based on electrical stimulation, and the use of flow-driven blood-based sorting using yoked channels (f-BIOPSY) for isolating circulating tumor cells without antibodies, along with a Serum-Based Mobile Driven Analyzer (SMART) for rapid diagnostics, and Parallel Incubators with Loaded Single Cells (PILLAR) for high-throughput single-cell gene expression analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional separation techniques (microscope-assisted manual isolation, FACS, MACS) are used for stem cell sorting, then cell sorting capability is achieved, but the process becomes error-prone, time-consuming, and labor-intensive
Solution Approach 1:
The patent replaces manual mechanical isolation methods with automated electrical field-based separation. The system uses electrical stimulation and field potential sensing to automatically sort cells, eliminating the need for microscope-assisted manual isolation and reducing both time and labor requirements while maintaining sorting accuracy.
Solution Approach 2:
The system enables cells to be sorted based on their intrinsic electrical properties and response to electrical stimulation without requiring external labeling or complex preparation. The automated detection and sorting process allows the system to perform sorting operations independently, reducing labor-intensive manual intervention.
2Reliability
If conventional separation techniques are used, then cell sorting is possible, but exogenous labeling or genetic modification is required which is not suitable for clinical applications
Solution Approach 1:
The patent extracts and utilizes the inherent electrical properties of cells for sorting, eliminating the need for exogenous labeling or genetic modification. By measuring field potentials and electrical responses naturally present in cells, the system achieves clinical-grade sorting without introducing foreign substances or complex genetic procedures.
Solution Approach 2:
The system changes the sorting parameter from optical or magnetic properties (which require labeling) to electrical properties (field potential and electrical response). This parameter change enables direct sorting of unlabeled cells, simplifying the overall process and improving clinical applicability.
3Adaptability or versatility
If fluorescence-activated cell sorting is used to sort multiple phenotypes, then sorting capability is improved, but labeling of cells is required
Solution Approach 1:
The electrical field-based sorting system provides a universal method that can sort multiple cell phenotypes based on their electrical properties without requiring different labeling strategies for each phenotype. The system detects and sorts cells based on intrinsic electrical characteristics, making it adaptable to various cell types without increasing complexity.
4Reliability
If magnetic-activated cell sorting is used, then sorting robustness is improved, but the ability to sort multiple cell types simultaneously is limited
Solution Approach 1:
The patent changes from magnetic property-based sorting to electrical property-based sorting. This parameter change enables the system to differentiate and sort multiple cell types simultaneously based on their distinct electrical responses, overcoming the limitation of magnetic-activated sorting while maintaining robustness through automated electrical detection.
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
These solutions enable efficient, high-throughput sorting and analysis of stem cells and tumor cells, improving their viability for therapeutic applications and facilitating early cancer diagnosis and personalized treatment strategies, while also enabling rapid and cost-effective diagnostics and gene expression profiling.
Implementation Method 1
surface electrodes have been used to detect electrical signals from cells such as extracellular ionic currents producing a characteristic field potential (FP) signal
Implementation Method 2
accurately detect single cells using impedance sensing
Implementation Method 3
isolation of tumor cells without the requirement for large and expensive apparatus using inertial fluidics
Data Source
AI summary
Microfluidic devices and methods that use cells such as cancer cells, stem cells, blood cells for preprocessing, sorting for various biodiagnostics or therapeutical applications are described. Microfluidics electrical sensing such as measurement of field potential or current and phenomena such as immiscible fluidics, inertial fluidics are used as the basis for cell and molecular processing (e.g., characterizing, sorting, isolation, processing, amplification.) of different particles, chemical compositions or biospecies (e.g., different cells, cells containing different substances, different particles, different biochemical compositions, proteins, enzymes etc.). Specifically, the present invention discloses a number of sorting schemes for stem cells, whole blood and circulating tumor cells, and extracting serum from whole blood.