Microfluidic Groove Acoustic Wave Sorting
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Solution Overview
Problem
Current surface acoustic wave (SAW) sorters primarily utilize the component of the acoustic wave oriented in the plane of the device, neglecting the significantly greater normal component for sorting purposes, which limits their efficiency in manipulating species within microfluidic systems.
Innovation Solution
A microfluidic apparatus and method that incorporates a groove in a surface of the channel and an acoustic wave generator positioned adjacent to it, allowing the application of acoustic waves with both axial and lateral components to deflect species orthogonally, effectively utilizing the normal component of the acoustic wave for sorting by refracting the waves within the fluid, thereby directing species to different outlets based on their interaction with the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only the in-plane component of acoustic waves is utilized for sorting, then the device structure remains simple, but sorting efficiency is limited
Solution Approach 1:
The patent introduces a groove structure that extends in the normal direction (z-direction) perpendicular to the device plane, enabling utilization of the normally-dominated acoustic wave component. This dimensional extension allows acoustic waves to interact with species through both the groove walls and the species-deflecting surface, effectively harnessing the normal component that was previously wasted, thereby resolving the contradiction between sorting efficiency and device complexity
Solution Approach 2:
The groove structure creates localized regions with different acoustic field characteristics. The groove walls and the species-deflecting surface create localized acoustic pressure gradients that selectively manipulate species within the groove region, allowing efficient sorting using the normal acoustic component without requiring complex device-wide modifications
2Productivity
If the normal component of acoustic waves is utilized for sorting, then sorting efficiency improves, but the device structure becomes more complex
Solution Approach 1:
The sorting channel is segmented into a groove region and a species-deflecting surface region, each serving specific functions. The groove provides acoustic trapping and manipulation, while the species-deflecting surface directs sorted species to outlet channels. This segmentation enables efficient utilization of the normal acoustic component for high-speed sorting without requiring complex integrated structures
Solution Approach 2:
The groove acts as an intermediary structure that mediates between the acoustic wave field and the species to be sorted. It converts the normal acoustic wave component into localized acoustic radiation pressure that efficiently manipulates species, enabling high sorting rates while maintaining relatively simple device architecture through the groove's geometric configuration
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
Enhances sorting efficiency and purity by harnessing the normal component of the acoustic wave, achieving high sorting rates and purities comparable to fluorescence-activated cell sorters, with the ability to redirect cells into a retention outlet with high success rates and maintain cell viability.
Implementation Method 1
Surface acoustic waves (SAWs) provide a method for driving flows and directing particle motion, e.g., in microfluidic systems
Implementation Method 2
The acoustic waves generated by a SAW transducer can efficiently actuate broad classes of species including particles, beads, cells, gels, and droplets in continuous flow
Implementation Method 3
refracting the waves within the fluid, thereby directing species to different outlets based on their interaction with the groove
Data Source
AI summary
The present invention generally relates to the manipulation of species using acoustic waves such as surface acoustic waves. In some aspects, a channel such as a microfluidic channel may be provided having two or more outlets, and acoustic waves applied to species within the channel to determine which outlet the species is directed to. For instance, surface acoustic waves may be applied to a species such as a cell or a particle to deflect it from the channel into a groove or other portion that directs it to a different outlet. In some cases, surprisingly, this deflection of species may be in a different direction than the incident acoustic waves on the channel. Other embodiments of the present invention are generally directed to kits including such systems, techniques for producing such systems, or the like.