Acoustic Particle Manipulation for High-Speed Flow Cytometry
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Solution Overview
Problem
Current flow cytometry technologies face limitations in sorting large particles due to stochastic particle arrival, mechanical constraints, and turbulence, resulting in low sorting rates and inefficiencies, particularly with particles larger than 1×10−4 meters in diameter.
Innovation Solution
The method employs axial and radial acoustic standing wave fields to focus and space particles uniformly within a cylindrical flow channel, ensuring predictable particle arrival and synchronization of droplet formation, allowing for high-speed sorting of large particles without mechanical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If larger flow channels and exit orifices are used to accommodate large particles, then particle clogging is prevented, but linear velocity of the flow stream decreases due to increased turbulence
Solution Approach 1:
The patent replaces mechanical particle positioning methods with acoustic field-based manipulation. Acoustic standing waves are used to focus and space particles along the flow axis, eliminating the need for mechanical adjustments to flow channel dimensions and avoiding turbulence-induced velocity losses while maintaining high sorting rates for large particles
Solution Approach 2:
The patent changes the physical state and distribution parameters of particles using acoustic fields. By applying acoustic standing waves, particles are transformed from a random distribution to a focused, uniformly spaced arrangement along the flow axis, enabling high-speed sorting without requiring changes to flow channel geometry that would reduce linear velocity
2Productivity
If higher pressure is applied to increase drop formation rate, then sorting speed increases, but mechanical limitations and cell effects restrict the maximum pressure that can be applied
Solution Approach 1:
The patent substitutes mechanical pressure-driven particle positioning with acoustic field-based manipulation. Acoustic standing waves focus and space particles along the flow axis without requiring high pressures, eliminating the trade-off between sorting speed and mechanical stress on cells while maintaining high drop formation rates
3Ease of operation
If stochastic particle arrival is accepted, then the system is simpler to operate, but empty droplets, multi-particle droplets, and particles at break-off points increase, leading to aborted sorting events
Solution Approach 1:
The patent uses acoustic vibration fields to manipulate particle positions. Acoustic standing waves create pressure nodes and antinodes that focus particles to specific locations along the flow axis, ensuring predictable single-particle arrival at droplet formation points and eliminating empty droplets, multi-particle droplets, and particles at break-off points
Solution Approach 2:
The patent employs periodic acoustic standing waves to create regular spacing of particles along the flow axis. This periodic action ensures that particles are uniformly distributed and arrive at predictable intervals, synchronizing particle arrival with droplet formation to prevent aborted sorting events while maintaining operational simplicity
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 significantly increases the sorting rate of large particles by ensuring precise positioning and spacing, reducing aborted sorting events and turbulence, while maintaining lower pressure requirements, thus enhancing the overall efficiency and throughput of particle sorting.
Implementation Method 1
a radial acoustic standing wave field to form inside the flow channel in the solution. These radial acoustic standing waves focus the particles suspended in the solution to the center axis of the cylindrical flow channel
Implementation Method 2
radial acoustic standing waves focus the particles suspended in the solution to the center axis
Implementation Method 3
a transducer is used to create an axial acoustic standing wave field in the flow channel parallel to the axis of the flow channel. This drives the particles, which are already being focused to the center axis of the flow channel, to nodes or anti-nodes of the axial standing wave at half-wavelength intervals
Implementation Method 4
axial acoustic standing wave field... drives the particles... to nodes or anti-nodes of the axial standing wave
Data Source
AI summary
One or more of the embodiments of the present invention provide for a method of non-contact particle manipulation and control of particle spacing along an axis which includes axial and radial acoustic standing wave fields. Particles are suspended in an aqueous solution, and this solution then flows into the cylindrical flow channel. While the solution flows through the flow channel, the outer structure of the flow channel is vibrated at a resonant frequency, causing a radial acoustic standing wave field to form inside the flow channel in the solution. These radial acoustic standing waves focus the particles suspended in the solution to the center axis of the cylindrical flow channel.At the same time, a transducer is used to create an axial acoustic standing wave field in the flow channel parallel to the axis of the flow channel. This drives the particles, which are already being focused to the center axis of the flow channel, to nodes or anti-nodes of the axial standing wave at half-wavelength intervals, depending on whether the particles are more or less dense and more or less compressible than the surrounding fluid.