Microfluidic Device Mixed-Flow Separation Without Membranes
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Solution Overview
Problem
Existing microfluidic devices for biomedical applications are often complex to produce and use, or they have low reliability, making them inefficient for separating and enriching particles in biological fluids.
Innovation Solution
A microfluidic device with a mixed-flow micro-separation system that uses a combination of microfluidic channels and auxiliary fluids to create turbulence and separation by adjusting the flow dynamics, allowing for efficient separation and enrichment of target particles without the need for additional components like membranes or sieves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional microfluidic devices use membranes or sieves for particle separation, then separation efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts and removes the membranes or sieves from the microfluidic device structure. Instead of using physical filtration barriers, the device achieves separation through flow dynamics control, eliminating complex components while maintaining separation efficiency through hydrodynamic focusing and differential migration in the microchannel.
Solution Approach 2:
The invention replaces the mechanical filtration system (membranes/sieves) with a fluid dynamics-based separation mechanism. By controlling flow rates, pressure gradients, and channel geometry, the device achieves particle separation through hydrodynamic effects rather than physical barriers, reducing mechanical complexity.
2Measurement precision
If microfluidic devices use additional components like membranes or sieves, then particle separation capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The invention extracts the membranes or sieves from the device architecture, simplifying the manufacturing process. The separation function is achieved through integrated flow control mechanisms and channel design, eliminating the need for separate filtration components that would complicate assembly and production.
Solution Approach 2:
The invention merges the separation function directly into the microchannel structure and flow control system. By integrating separation capabilities into the basic fluidic pathway design rather than adding separate components, the device becomes easier to manufacture using standard microfabrication techniques.
3Measurement precision
If microfluidic devices use complex separation mechanisms, then separation precision is improved, but reliability decreases
Solution Approach 1:
The invention extracts vulnerable components like membranes and sieves that can clog, tear, or degrade. By removing these failure-prone elements and relying on robust flow dynamics control, the device achieves high separation precision while improving reliability through a simpler, more durable design.
Solution Approach 2:
The invention implements self-service through flow-driven separation where the fluid dynamics automatically perform the separation function without requiring additional active components or complex mechanisms. This passive, self-regulating approach enhances reliability by eliminating points of failure while maintaining precision.
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 enables efficient separation and enrichment of target particles with reduced mechanical stress and damage to cells, allowing for effective analysis of biological fluids with minimal equipment complexity and improved reliability.
Implementation Method 1
uses a combination of microfluidic channels and auxiliary fluids to create turbulence and separation by adjusting the flow dynamics
Implementation Method 2
separating and enriching particles in biological fluids through mixed-flow micro-separation
Data Source
AI summary
A biomedical microfluidic device for separating a sub-population of particles from a first fluid, particularly a biological fluid, has means for separation and/or filtration of the fluid, which include a first microfluidic path defined in a first body of the device, a first inlet for introduction of a first fluid in the first path and at least a first outlet for discharge from the first path of a sample of fluid enriched in the sub-population of particles.