Microfluid Focusing Device with Junction Sheaths
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Solution Overview
Problem
Current fluid flow focusing technologies face challenges in ease of fabrication and limited flow rate capabilities, particularly in sheath-based 3D hydrodynamic focusing systems, which are complex and restricted by curvature and inertial effects.
Innovation Solution
A multi-dimensional micro fluid focusing device with a microchannel design featuring distinct regions and sheaths at junctions, allowing for independent or common inlets, formed from materials like Polydimethylsiloxane (PDMS), enables easy fabrication and adjustable flow rates, facilitating multi-dimensional focusing of fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If 3D hydrodynamic focusing using a microfluidic device with curved channel section is employed, then out-of-plane focusing sheath is provided, but fabrication complexity increases and flow rate is limited due to curvature and inertial effects
Solution Approach 1:
The microchannel is divided into distinct regions (first region, middle region, second region) with junctions at specific locations. Sheaths are positioned at these junctions to provide focusing action at different stages, simplifying the overall channel geometry while maintaining focusing precision
Solution Approach 2:
The invention transitions from curved channel sections to straight channel segments with vertical junctions, utilizing multi-dimensional positioning of sheaths at junctions to achieve out-of-plane focusing without relying on curved geometries that limit flow rate
2Manufacturing precision
If curved microfluidic channel section is used for 3D hydrodynamic focusing, then out-of-plane focusing is achieved, but flow rate is limited due to curvature and inertial effects
Solution Approach 1:
The invention replaces curved channel sections with straight channels and utilizes vertical junctions to achieve focusing. The sheaths are positioned at junctions to provide the necessary focusing action without requiring curved geometries, thereby enabling higher flow rates while maintaining focusing precision
Solution Approach 2:
The system uses hydrodynamic principles with sheath flows at junctions to achieve focusing. By utilizing the hydraulic action of sheaths positioned at specific junctions in straight channels, the system achieves out-of-plane focusing without the flow rate limitations imposed by curved channels
3Productivity
If sheath-based 3D hydrodynamic focusing is used, then flow rate is not limited, but fabrication complexity increases
Solution Approach 1:
The microchannel is segmented into distinct regions with junctions at specific locations. Sheaths are positioned at these junctions to provide focusing action, simplifying the fabrication process while maintaining the ability to handle various flow rates
Solution Approach 2:
The channel geometry is designed with specific local features at junctions where sheaths are positioned. These localized structural modifications enable focusing functionality without requiring complex overall channel designs, thereby reducing fabrication complexity while maintaining flow rate capability
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 simplifies fabrication, enhances flow rate handling, and achieves robust fluid focusing with adjustable sheath positions and depths, enabling effective analysis of focused fluids across various applications.
Implementation Method 1
The curved channel section provides hydrodynamic focusing of the sample flow in an out-of-plane direction
Implementation Method 2
A first sheath positioned proximal to the first junction and a second sheath positioned at the second junction
Data Source
AI summary
A multi-dimensional micro fluid focussing device. The device includes an apparatus for multi-dimensional micro fluid focussing. The device also includes an analyser for analysing the focused fluid. The apparatus includes a microchannel having an inlet defining a first region, a middle region and an outlet defining a second region. A first junction is formed at the intersection of the first region and the middle region. A second junction is formed at the intersection of the middle region and the second region. A first sheath positioned proximal to the first junction and a second sheath positioned at the second junction. The junctions formed, along with the positioning of the sheaths enable the multi-dimensional focusing of the fluid. The analyser includes a holder for removably retaining the apparatus. A microscope is positioned across the holder. A recording unit is coupled to the microscope.