Angled Microchannel Segments for 3D Hydrodynamic Focusing
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Solution Overview
Problem
Two-layer chip systems face challenges in achieving reliable three-dimensional hydrodynamic focus at low fluid transport speeds, leading to movement blur issues, especially in flow cytometry applications, where existing solutions rely on two-dimensional focusing methods that require multiple direction changes or complex rotation setups.
Innovation Solution
The arrangement and procedure involve strategically angled micro-channel segments in a two-layer chip system, utilizing Computational Fluid Dynamics to calculate fluid rotation angles, allowing for a single system to achieve three-dimensional hydrodynamic focus through fluid rotation, enabling efficient fluid focusing without the need for multiple direction changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two-dimensional hydrodynamic focusing is used in two-layer chip systems, then the system structure remains simple, but three-dimensional focusing capability is not achieved
Solution Approach 1:
The patent introduces a rotational dimension to the traditional two-dimensional hydrodynamic focusing by arranging channel segments at specific angles (e.g., 45 degrees) relative to each other in the vertical direction. This angular arrangement creates a rotation component that transforms the focusing from 2D to 3D, enabling the fluid lamella to be oriented perpendicular to the chip plane while maintaining the simplicity of the two-layer structure.
2Adaptability or versatility
If multiple channel direction changes are implemented to achieve fluid rotation, then three-dimensional focusing is achieved, but the device complexity increases
Solution Approach 1:
The patent divides the channel into multiple discrete segments (first, second, third, fourth channel segments) arranged at specific angles to each other. Each segment contributes a specific angular deflection to the fluid flow, and by combining these segmented angular changes, the system achieves the desired 3D focusing effect while keeping each individual segment simple and manageable.
3Measurement precision
If low fluid transport velocities are used to avoid motion blur, then image clarity improves, but the time required for analysis increases
Solution Approach 1:
The patent creates a localized region of extended residence time within the detection cuvette by orienting the fluid lamella perpendicular to the chip plane. This three-dimensional focusing concentrates the sample in a specific spatial region, allowing sufficient time for high-quality imaging at low velocities while the overall system throughput is maintained through efficient sample presentation to the detection zone.
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
This approach allows for reliable three-dimensional fluid focusing in a single two-layer chip system, reducing motion blur and enabling optimal conditions for fluorescence imaging and flow cytometry by maintaining laminar flow and low Reynolds numbers, even with high-viscosity fluids, thus improving image clarity and reducing operational complexity.
Implementation Method 1
three-dimensional hydrodynamic focusing at preferably low transport velocities to avoid motion blur
Implementation Method 2
maintaining laminar flow and low Reynolds numbers
Data Source
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AI summary
The invention relates to an arrangement and method for fluid rotation in the case of fluid transportation speeds with low Reynolds numbers, in particular for use in a two-layer chip system, and in the case of Reynolds numbers Re < 10 for three-dimensional hydrodynamic focussing, in particular for image-based throughflow cytometry. The object of the invention of specifying an arrangement and method for fluid rotation which permit the implementation of three-dimensional hydrodynamic focussing on just one two-layer chip system is achieved in that two or more channel segments are connected offset with respect to one other at their ends and arranged at an angle with respect to one another, as a result of which the through-flowing medium respectively experiences changes in direction which together bring about rotation of the medium about the axis in the direction of flow.