Microfluidic Mixer With Peristaltic Actuation
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Solution Overview
Problem
Microfluidic devices face challenges in efficiently mixing fluids due to laminar flow, requiring large mixing lengths or complex structures, and existing active mixing techniques often necessitate specialized actuators and are costly for mass manufacturing.
Innovation Solution
A microfluidic mixer comprising a substrate and a flexible layer with perturbation formations, where mechanical actuators compress and decompress the flexible layer to create a peristaltic movement, enhancing mixing efficiency within a compact mixing chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If passive mixing structures are used in microfluidic channels, then mixing is achieved through diffusion, but the mixing length becomes rather large requiring large footprint on the device
Solution Approach 1:
The patent applies dynamic actuation to the mixing structures, transforming static passive mixers into dynamic systems that can actively perturb fluid flow. The actuated mixing structures create time-varying flow patterns that enhance mixing efficiency while maintaining a compact footprint, resolving the contradiction between mixing effectiveness and device size.
Solution Approach 2:
The patent employs periodic actuation of the mixing structures, where the mixing elements are cyclically activated and deactivated. This periodic action creates repeated perturbations in the laminar flow, enhancing diffusion and advection mixing processes within a short distance, thereby achieving efficient mixing without requiring large mixing lengths.
2Productivity
If more complicated structures and 3D structures are proposed to shorten mixing length, then mixing efficiency improves, but manufacturing difficulty increases
Solution Approach 1:
The patent divides the mixing function into separate components: a base substrate with fluidic channels and separate actuated mixing structures. This segmentation allows each component to be manufactured using simpler, more conventional processes, while the assembled system achieves advanced mixing performance through the coordinated interaction of these modular elements.
Solution Approach 2:
The patent utilizes parameter changes in the actuation process (such as frequency, amplitude, and timing of actuation) to optimize mixing efficiency without requiring complex structural modifications. By tuning these operational parameters, the system achieves effective mixing with relatively simple manufacturing requirements.
3Productivity
If active mixing techniques are used to enhance mixing performance, then mixing efficiency improves, but special actuators are needed increasing device complexity and cost
Solution Approach 1:
The patent designs the actuated mixing structures to serve multiple functions: they act as both mixing elements and flow control components. This multi-functionality reduces the need for separate specialized actuators and components, simplifying the overall device architecture while maintaining effective active mixing performance.
Solution Approach 2:
The mixing structures in the patent are designed to be self-actuating or self-regulating to some extent, where the fluid flow itself or simple external actuation triggers the mixing action. This self-service characteristic reduces the complexity of control systems and specialized actuators required, making the device more practical for real-world applications.
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 solution enables fast and efficient fluid mixing with a reduced footprint, easy manufacturing through injection molding, and minimal dead volume, while avoiding the need for complex structures or expensive actuators.
Implementation Method 1
a flexible layer having formations defining a fluid channel which, when the flexible layer is positioned over the substrate so as to cover at least the channel fluid ports, provides a fluid communication path between the channel fluid ports but which, when a force is applied to press the flexible layer towards the substrate, deforms so as to inhibit fluid communication between the channel fluid ports
Implementation Method 2
mechanical actuators compress and decompress the flexible layer to create a peristaltic movement, enhancing mixing efficiency within a compact mixing chamber
Data Source
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AI summary
The invention relates to and provides a microfluidic mixer, formed by two parts, a first part being a substrate 30 having formations defining fluid channels on an outer surface that is directed towards a second part, which is a flexible layer 20, wherein the flexile layer has formations defining fluid channel which, when the flexible layer is positioned over the substrate so as to cover the fluid channels of the substrate to provide a fluid communication path, wherein a section of said communication path comprises at least a first and a second fluid channel 1, 2 for providing a first and a second fluid, wherein first and second fluid channel merge before an inlet 9 of a mixing chamber 10 into a merged fluid channel 5, wherein the mixing chamber comprises perturbation formations 12, and an outlet 11 of the mixing chamber is connected to an outlet fluid channel 13, wherein the flexible layer comprises points for compression at the inlet and outlet of the mixing chamber for closing the merged fluid channel and the outlet fluid channel connected to inlet and outlet of the mixing chamber, characterised in that the perturbation formations of the mixing chamber are vertically arranged walls, pillars, or tubes with respect to an inner surface.