Multi-dimensional Double Spiral Microfluidic Device for Particle Separation
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Solution Overview
Problem
Spiral microfluidic devices face limitations in separating particles with intermediate confinement ratios due to low separation performance and require complex flow control, making them less reliable and less applicable for clinical use, especially in separating particles across a wide size range without additional sheath flow.
Innovation Solution
A multidimensional double spiral (MDDS) microfluidic device with a first spiral channel and a second spiral channel of larger cross-sectional area, connected by a transition region, allows for the concentration and size-based separation of particles without additional sheath flow, using inertial and Dean drag forces to focus particles at different equilibrium locations, and a check-valve based recirculation system for closed-loop operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spiral microfluidic devices are used for particle separation, then separation can be achieved for large CR particles, but separation performance is low for particles with intermediate CR condition
Solution Approach 1:
The device is divided into multiple spiral microchannels with different cross-sectional areas (small, medium, large) arranged in parallel. Each channel segment is optimized to handle specific CR ranges, allowing the system to process particles across a wide size spectrum simultaneously. This segmentation enables reliable separation of intermediate CR particles while maintaining versatility for different particle types.
Solution Approach 2:
The invention introduces a new dimension by varying the cross-sectional area of spiral channels rather than using uniform dimensions. By creating channels with small, medium, and large cross-sectional areas, the device adds a dimensional parameter (channel size) that enables separation of particles with intermediate CR ratios that cannot be effectively separated in conventional uniform channels.
2Measurement precision
If additional sheath flow is used to improve separation performance, then separation resolution can be enhanced, but flow control becomes complex and operating flexibility is limited
Solution Approach 1:
The parallel spiral microchannel structure inherently provides different Dean flow characteristics and inertial focusing positions for each channel size without requiring external sheath flow. The system serves itself by using the geometric differences of the channels to achieve separation, eliminating the need for complex additional flow control mechanisms while maintaining high separation resolution.
Solution Approach 2:
The device achieves multiple separation functions across different CR ranges using a single integrated structure without requiring additional sheath flow inlets or complex flow control systems. Each spiral channel performs separation for its optimized CR range simultaneously, providing universal separation capability while simplifying the overall device architecture.
3Ease of operation
If conventional spiral devices are used, then operation can be simple, but separation performance for wide size range particles is insufficient
Solution Approach 1:
The device segments the flow path into multiple parallel spiral channels with different cross-sectional areas, each optimized for specific particle size ranges. This segmentation maintains operational simplicity as all channels are driven by the same inlet flow, while significantly improving separation efficiency for particles across a wide size range through the combined effect of different channel geometries.
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 MDDS device achieves high separation resolution and efficiency for particles across a wide size range, including intermediate CR particles, with simplified operation and reduced need for complex flow control, enabling reliable and portable clinical applications.
Implementation Method 1
the MDDS comprises: a first spiral microchannel configured to concentrate a particle stream into a concentrated particle stream
Implementation Method 2
using inertial and Dean drag forces to focus particles at different equilibrium locations
Implementation Method 3
the second spiral microchannel configured to separate particles from the concentrated particle stream based on their sizes
Implementation Method 4
using inertial and Dean drag forces to focus particles at different equilibrium locations
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
Described is a multi-dimensional double spiral (MODS) microfluidic device comprising a first spiral microchannel and a second microchannel, wherein the wherein the first spiral microchannel and second spiral microchannel have different cross-sectional areas. Also described is a device comprising a multi-dimensional double spiral and system for recirculation. The invention also encompasses methods of separating particles from a sample fluid comprising a mixture of particles comprising the use of the multi-dimensional double spiral microfluidic device.