Spiral Microfluidic Channels with Concentric Electrodes for Cell Separation
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Solution Overview
Problem
Existing cancer diagnosis methods rely on time-consuming and expensive genetic analysis, and existing dielectrophoretic systems are limited to single cancer types, operate qualitatively, and lack reproducibility due to complex electrode geometries and electric field applications, restricting standalone operation and simultaneous analysis.
Innovation Solution
A dielectrophoretic micro cell chromatography device with concentric electrodes and spiral microfluidic channels fabricated using MEMS technology, enabling parallel, simultaneous, and identical cell separation with adjustable electric field characteristics, manufactured using Parylene Suspended Channel Technology on glass for high reproducibility and low cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex electrode geometries and complex electric field application methods are used, then certain cancer types can be diagnosed, but device complexity increases and standalone operation is restricted
Solution Approach 1:
The patent employs concentric electrodes with spiral microfluidic channels that can diagnose multiple cancer types through a single unified structure. The device achieves multi-functionality by varying operating parameters (voltage, frequency) rather than requiring different electrode geometries for different cancer types, thus maintaining simplicity while enabling broad diagnostic capability
Solution Approach 2:
The invention changes electrical parameters (voltage amplitude, frequency) of the applied electric field to adapt the device for different cancer types and cell separation modes. This parameter-based adaptability replaces the need for complex geometric modifications, allowing the same physical structure to serve multiple diagnostic purposes
2Reliability
If devices operate sequentially rather than in parallel, then individual analysis can be performed, but reliability and reproducibility of results decrease
Solution Approach 1:
The patent divides the system into multiple parallel microfluidic channels, each capable of independent cell separation. This segmentation allows simultaneous processing of multiple samples under identical conditions, improving both throughput and reproducibility by eliminating sequential operation variability
Solution Approach 2:
The invention merges multiple separation channels into a single integrated device with concentric electrodes, allowing parallel operation of multiple channels while maintaining uniform electric field conditions. This combination enables simultaneous analysis that improves statistical reliability through repeated measurements under identical conditions
3Manufacturing precision
If conventional fabrication methods are used, then device production is simple, but manufacturing precision and reproducibility are insufficient
Solution Approach 1:
The patent replaces conventional mechanical fabrication methods with MEMS (micro-electromechanical systems) technology to manufacture the device. MEMS provides precise control over microfluidic channel and electrode geometries at the microscale, achieving high manufacturing precision through standardized semiconductor fabrication processes
Solution Approach 2:
The invention utilizes Parylene Suspended Channel Technology, changing the material parameter to Parylene coating, which enables precise channel formation through controlled deposition thickness. This material-based precision approach simplifies fabrication by replacing complex mechanical alignment and bonding processes
4Measurement precision
If high resolution cell separation is achieved, then cancer cells with parameters close to normal cells can be separated, but device complexity and cost increase
Solution Approach 1:
The patent employs spiral (curved) microfluidic channels instead of straight channels, creating a rotating electric field pattern that enhances dielectrophoretic separation. The spiral geometry naturally generates the necessary field gradients for high-resolution separation without requiring additional complex components, achieving improved resolution through elegant geometric design
Solution Approach 2:
The invention uses the natural dielectrophoretic properties of cells in a controlled electric field, copying the physical principle of cell response to alternating electric fields and amplifying it through the spiral channel geometry. This approach achieves high resolution by leveraging fundamental cell physics rather than requiring complex mechanical or chemical separation mechanisms
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
The device provides high-resolution, fast, and cost-effective cell separation, enabling early cancer diagnosis, reducing treatment time, and facilitating multipurpose usage in disease diagnosis and treatment, with increased reliability and portability, allowing for use in remote health centers without complex equipment.
Implementation Method 1
Dielectrophoretic characteristics of the cells may vary with many condition and disease. This study focuses on variations in these parameters caused by various cancers.
Implementation Method 2
The device performs automated cell separation, using spiral microchannels installed in between two concentric electrodes.
Data Source
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AI summary
This dielectrophoretic micro cell chromatography device with concentric electrodes and spiral microfluidic channels, produced according to MEMS technology subject to this invention; is composed of 4 groups of effect electrodes, inlet electrodes, spiral zone and central span, having exterior upper electrode (1), interior sub electrode with 3D geometry (2), upper inlet electrode (3), sub inlet electrode (4), spiral zone (5), central span (6), constant reading point and Insulating wafer (7) as the main components.