Integrated Microfluidic DEP Device for Continuous Cell Sorting
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Solution Overview
Problem
Conventional dielectrophoresis (DEP) devices for cell separation require supplementary processes like centrifugation for sample concentration and are limited to batch processing, which decreases efficiency and throughput, and introduces opportunities for cell death and variation in separation results.
Innovation Solution
The integration of an alignment region for inertial focusing, a DEP region with unique electrode geometry for electric field-induced cell separation, and an on-chip analysis region with impedance detection for continuous flow and efficient characterization of cells based on their electrical properties, allowing for improved separation, identification, and characterization without the need for additional off-chip processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional DEP devices are used for cell separation, then cell separation can be achieved, but supplementary off-chip processes like centrifugation are required which decrease efficiency and throughput
Solution Approach 1:
The patent combines multiple functions (cell concentration, alignment, separation, and analysis) into a single integrated microfluidic chip. The concentration region pre-concentrates cells, the alignment region focuses them into streams, the DEP region separates them, and the analysis region characterizes them - all within one device, eliminating the need for separate centrifugation and analysis steps
Solution Approach 2:
The microfluidic chip is designed as a multi-functional platform that performs sample preparation, cell separation based on dielectrophoresis, and impedance analysis all in one device. This universal design allows a single device to replace multiple separate instruments and processes
2Reliability
If batch processing is used in DEP devices, then cell separation can be performed, but it introduces opportunities for cell death and variation in separation results
Solution Approach 1:
The device enables continuous flow processing where cells are constantly moved through the microfluidic channels from concentration to alignment to separation to analysis. This continuous operation eliminates the start-stop nature of batch processing, maintaining consistent separation conditions and reducing cell exposure time to potentially harmful environments
3Object-affected harmful factors
If conventional DEP devices are used, then cell separation is achieved, but additional off-chip processes are required which increase cell damage opportunities
Solution Approach 1:
By integrating concentration, alignment, separation, and analysis functions into one chip, the patent eliminates the need to transfer cells between different devices and containers. This single-platform approach minimizes mechanical handling and exposure to potentially damaging conditions that occur during multiple off-chip process steps
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 enhances the efficiency and throughput of cell separation and characterization by aligning cells into focused streams, enabling continuous flow and accurate impedance-based analysis, reducing cell damage and variation, and facilitating higher precision in separating cells based on their electrical properties.
Implementation Method 1
an alignment region for inertial focusing
Implementation Method 2
Dielectrophoresis (DEP) is the motion of a particle in a suspending medium due to the presence of a non-uniform electric field. DEP utilizes the electrical properties of the cell/particle and the media as well as unique electrode geometries and configurations to induce specific cell/particle motion through polarization
Implementation Method 3
an on-chip analysis region with impedance detection for continuous flow and efficient characterization of cells based on their electrical properties
Data Source
AI summary
Disclosed herein are dielectrophoresis (DEP) devices having an alignment region, a DEP region, and an analysis region for characterizing particles. Disclosed herein are methods of characterizing particles, the methods include aligning particles along one or more walls of a microfluidic device, applying a non-uniform electric field to the particles, receiving the particles in a plurality of outlet channels, respectively, based on one or more electrical properties of the plurality of particles, passing at least one of the particles in one of the plurality of outlet channels through an impedance detector, and/or detecting an impedance measurement characteristic of at least one property of the at least one of the particles.