Semi-spiral Microchannels for Blood Particle Isolation
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Solution Overview
Problem
Current methods for isolating blood-borne bacteria, extracellular vesicles (EVs), and viruses are inefficient, costly, and not suitable for small volume processing, particularly in clinical diagnostics and biomanufacturing, due to laborious centrifugation protocols and lack of inline monitoring capabilities.
Innovation Solution
A microfluidic device with semi-spiral-shaped channels and a configuration of inlet and outlet ports that allows for the direct isolation of particles from a sample without centrifugation, enabling efficient separation of particles based on size through Dean migration effects, and facilitating inline monitoring of EV/virus production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional centrifugation methods are used to isolate bacteria, EVs, and viruses from blood, then separation can be achieved, but the process becomes laborious, time-consuming, and不适合 for small volume processing
Solution Approach 1:
The patent replaces the mechanical centrifugation system with a microfluidic system that uses Dean migration effects in curved channels. The microfluidic device uses fluid flow dynamics rather than mechanical rotation to achieve particle separation, eliminating the need for centrifuges and manual操作流程
Solution Approach 2:
The patent transitions from bulk liquid processing to microscale channel flow, utilizing the third dimension (vertical displacement in curved channels) to achieve separation. Particles migrate to different heights within the channel cross-section due to Dean migration, enabling separation that would be difficult in conventional planar systems
2Measurement precision
If ultracentrifugation is used to isolate EVs and viruses, then separation can be achieved, but the process becomes inefficient, inconsistent, and costly
Solution Approach 1:
The patent changes the separation parameter from density-based (centrifugation) to size-based (Dean migration). By adjusting flow rate and channel geometry, the system achieves consistent separation of EVs and viruses based on their size, providing both high purity and efficient processing
Solution Approach 2:
The patent employs curved microchannels that generate Dean vortices through geometric curvature. This curvature-induced secondary flow creates vertical migration of particles based on size, achieving consistent separation without the complexity and cost of ultracentrifugation equipment
3Reliability
If multi-step centrifugation protocols are used for bacteria isolation, then separation can be achieved, but the process becomes laborious and time-consuming
Solution Approach 1:
The patent combines multiple separation steps into a single integrated microfluidic device. The device performs sequential separation of different particle sizes (bacteria, platelets, EVs, viruses) in one continuous flow process, achieving complete separation without multiple manual centrifugation steps
Solution Approach 2:
The patent incorporates preliminary size-based sorting within the microfluidic device itself, with larger particles (bacteria) being separated first in wider channels, followed by smaller particles (EVs, viruses) in narrower downstream channels. This preliminary action in the device design eliminates the need for subsequent manual separation steps
4Measurement precision
If traditional isolation methods are used for plasma extraction, then plasma can be obtained, but incomplete cell removal results in high background noise for biomarker detection
Solution Approach 1:
The patent segments the blood sample into different particle size fractions through the microfluidic device. By creating distinct flow paths and separation zones, the device achieves complete removal of cellular components while preserving plasma, resulting in low background noise suitable for sensitive biomarker 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
The microfluidic device enables rapid, efficient, and cost-effective isolation of low abundance bacteria, EVs, and viruses from small blood volumes, reducing processing time and improving diagnostic accuracy, while also allowing for inline monitoring in biomanufacturing processes.
Implementation Method 1
enabling efficient separation of particles based on size through Dean migration effects
Data Source
AI summary
Herein disclosed is a microfluidic device comprising: semi-spiral-shaped channels in fluid communication with (i) at least two inlet ports and (ii) at least two outlet ports, wherein the at least two inlet ports comprise: a sample inlet port and a sheath inlet port, wherein the sample inlet port is in fluid communication with sample inlet channels, each of the sample inlet channels is connected to one semi-spiral-shaped channel, and wherein the sheath inlet port is in fluid communication with sheath inlet channels, each of the sheath inlet channels is connected to one semi-spiral-shaped channel; wherein the at least two outlet ports comprise a first outlet port and each of the semi-spiral-shaped channels has a first outlet channel connected to the first outlet port, and wherein each first outlet channel is longer than any other outlet channel connected to the same semi-spiral-shaped channel. A method of fractionating particles is also disclosed.