Tubular Array for Fluidic Focusing with Optical Access
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Solution Overview
Problem
Current methods for three-dimensional flow focusing in applications like flow cytometry require complex optical setups, precision fabrication, and electrical networks, making them cumbersome and costly, while also limiting optical access.
Innovation Solution
A simplified apparatus using an array of silica glass capillary tubes with sheath and sample inlet ports, a flow focusing section, and an optical access section, which creates a three-dimensional sheathed flow without the need for complex fabrication, allowing independent control of sheath and sample flows and enabling straightforward optical access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional 3D flow focusing methods (optical gradient focusing, groove/chevron focusing, acoustic driven focusing) are used, then flow focusing performance is improved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The device segments the flow focusing function into multiple independent capillary tubes arranged in a specific pattern, where each tube contributes to the overall 3D focusing effect. This segmentation allows achieving complex flow patterns through simple individual components, reducing fabrication difficulty while maintaining focusing performance
Solution Approach 2:
The invention uses nested capillary tubes where inner capillaries are positioned within outer capillaries, creating multiple concentric flow streams. This nesting structure enables 3D flow focusing through hydrodynamic interactions between nested streams, achieving precise particle positioning without complex external control systems
2Manufacturing precision
If traditional 3D flow focusing methods are used, then flow focusing performance is improved, but fabrication complexity increases
Solution Approach 1:
The device is fabricated by assembling multiple standard capillary tubes rather than creating a single complex monolithic structure. This segmentation allows use of commercially available capillaries with precise dimensions, eliminating the need for precision groove fabrication or complex optical component assembly while achieving 3D focusing through the arranged tube configuration
Solution Approach 2:
The invention achieves flow focusing by changing flow rate parameters of different capillary streams rather than relying on fixed geometric features. By independently controlling flow rates in nested capillaries, the system dynamically adjusts focusing performance, simplifying fabrication while maintaining manufacturing precision
3Measurement precision
If complex optical setups are used for flow focusing, then detection precision is improved, but optical access becomes limited
Solution Approach 1:
The nested capillary structure itself serves as the focusing mechanism, eliminating the need for separate complex optical focusing systems. The hydrodynamic focusing occurs automatically through the capillary arrangement, allowing straightforward optical access for detection without requiring complex beam profiles or optical alignment
4Manufacturing precision
If precision electrode or PZT networks are used for flow focusing, then flow focusing performance is improved, but device complexity and cost increase
Solution Approach 1:
The invention replaces electrical or acoustic focusing mechanisms with a purely mechanical/hydrodynamic system using nested capillary tubes. This substitution eliminates the need for precision electrodes, PZT networks, or complex optical beams, achieving 3D flow focusing through simple fluid dynamic interactions while reducing device complexity and cost
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 apparatus achieves stable and efficient three-dimensional flow focusing with improved optical access, reducing detection errors and costs, and is suitable for both 3D and 2D focusing applications, with the ability to handle fast flows and compact design.
Implementation Method 1
Laminar flow, including sheath flow, is a technique useful in a variety of applications
Implementation Method 2
fluidic (e.g., hydrodynamic) forces compress the core flow stream into a narrow region
Implementation Method 3
Sheath flow involves surrounding a central flow stream (the core) with a surrounding stream (the sheath)
Implementation Method 4
the apparatus is operable to create a three-dimensional sheathed flow around a fluid introduced into the sample inlet port
Data Source
AI summary
An apparatus for creating sheathed flow includes an inlet section comprising an array of tubes including at least one sheath inlet port and a sample inlet port, a flow focusing section downstream from the inlet section, an optical access section downstream from the flow focusing region and comprising opposing flat surfaces, and an outlet section downstream from the optical access section, wherein the apparatus is operable to create a sheathed flow around a fluid introduced into the sample inlet port and to maintain the sheathed flow through the optical access section. Applications of the apparatus and method include bead/particle counting, flow cytometry, waveguiding, and fluid control.