Acoustic Waveguide for Boundary-Free Particle Transport
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Solution Overview
Problem
Existing acoustic tweezers face limitations in particle manipulation due to the need for physical boundaries within the fluid chamber, which can damage sensitive particles and increase system complexity, while also restricting flow rates and path definitions.
Innovation Solution
The use of external waveguide control structures that direct acoustic energy to create confined and complex particle paths without physical boundaries within the fluid layer, allowing for the manipulation of particles with positive and negative acoustic contrasts along predefined paths using a minimal number of acoustic sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If physical boundaries are placed inside the chamber to guide particles along preferred trajectories, then particle transport control is improved, but system complexity increases and particles may be damaged during transport
Solution Approach 1:
The patent replaces physical mechanical boundaries with an acoustic field-based system. Acoustic waves are used to create virtual walls and guide structures that manipulate particle trajectories without physical contact. The acoustic radiation pressure fields serve as substitutes for physical channels, allowing particles to be transported along predefined paths while eliminating the need for complex internal physical structures.
Solution Approach 2:
The patent introduces an acoustic field as an intermediary between the particle manipulation goal and the physical chamber structure. The acoustic waves act as a mediator that transfers control to particles, enabling precise trajectory guidance through acoustic pressure gradients without requiring direct physical guidance structures within the chamber.
2Ease of operation
If physical boundaries are placed inside the chamber to create narrow channels, then particle trajectory guidance is improved, but flow rate decreases due to high flow resistance
Solution Approach 1:
The patent substitutes physical narrow channels with acoustic field confinement. Instead of using physical walls to create narrow passages that restrict flow, acoustic radiation pressure fields are used to confine particles to desired trajectories. This allows the bulk fluid to flow freely at high rates while particles are guided along specific paths through acoustic forces, eliminating the flow resistance problem inherent in physical microchannels.
3Ease of operation
If physical boundaries are placed inside the chamber, then particle path definition is improved, but clogging risk increases due to particles sticking to boundaries
Solution Approach 1:
The patent replaces physical contact-based path definition with contactless acoustic field guidance. Particles are confined and guided along predefined trajectories through acoustic radiation pressure fields rather than physical walls. This eliminates particle adhesion to boundaries, preventing clogging while maintaining precise path definition. The acoustic field creates virtual confinement that does not require physical contact between particles and chamber structures.
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 enables efficient and selective particle trapping and transport along arbitrary paths, enhancing flow rates and reducing clogging risks, while maintaining particle integrity and simplifying system complexity.
Implementation Method 1
acoustic forces to trap and transport particles along a predefined path
Data Source
AI summary
The present disclosure describes systems and methods for versatile acoustic tweezer trapping and transport configurations. Examples can use ultrasound for contact-free, biocompatible, and precise manipulation of particles from millimeter to sub-micrometer scale along a narrow and complex path. Examples include spatially complex particle trapping and manipulation inside a boundary-free chamber using a single pair of sources and a shadow waveguide. The shadow waveguide structure can be disposed just outside a microfluidic chamber to guide and control the acoustic wave fields inside the chamber. The shadow waveguide can create a tightly confined, spatially complex acoustic field inside the chamber without an interior structure that could interfere with net flow or transport.