Acoustic Focusing Capillaries for High-Throughput Cytometry
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Solution Overview
Problem
Traditional flow cytometry is limited by fast transit times, which reduce sensitivity and resolution due to high photon flux, while slow flow systems face clogging issues and low sensitivity in sheathless instruments, and planar focusing does not align particles suitably for cytometers.
Innovation Solution
Acoustic focusing capillaries with piezoelectric vibration sources and grooves are used to stabilize particle streams, allowing simultaneous hydrodynamic and acoustic focusing, enabling quasi-planar alignment and reduced sheath fluid consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional flow cytometry uses high volumetric flow rates for hydrodynamic focusing, then particle throughput is improved, but particle transit time through the interrogation point decreases, reducing sensitivity and resolution
Solution Approach 1:
The patent replaces the mechanical hydrodynamic focusing system with an acoustic focusing system using surface acoustic waves (SAW). The SAW device creates acoustic radiation pressure that focuses particles at the interrogation point without requiring high volumetric flow rates, thereby maintaining both high throughput and long transit times for improved sensitivity and resolution
Solution Approach 2:
The invention changes the flow rate parameter from high (100-1000 times sheath to sample) to low (comparable or lower sheath to sample ratios), while using acoustic radiation pressure to maintain particle focusing. This parameter change allows extended particle residence time at the interrogation point, improving measurement precision without sacrificing productivity
2Measurement precision
If slow flow rates are used to increase particle transit time and sensitivity, then measurement precision is improved, but particle throughput decreases and clogging issues arise
Solution Approach 1:
The patent substitutes acoustic radiation pressure for hydrodynamic pressure to achieve particle focusing. This allows slow flow rates (improving sensitivity) without requiring high sheath fluid volumes, thereby maintaining high particle throughput and preventing clogging in the microfluidic channels
3Measurement precision
If high laser power is used to increase photon flux for better signal, then measurement precision is improved, but photobleaching and background scatter increase
Solution Approach 1:
The invention changes the particle transit time parameter by reducing flow rate and using acoustic focusing to maintain particle concentration at the interrogation point. This extends the interaction time between particles and laser, providing sufficient signal strength at lower laser power levels, thereby reducing photobleaching and background scatter
Solution Approach 2:
The acoustic radiation pressure acts as an intermediary that concentrates particles at the interrogation point, increasing the local particle density and signal generation efficiency without requiring increased laser power, thus avoiding the harmful effects of high photon flux
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 sensitivity and resolution by stabilizing particle focus, reducing clogging, and improving sample throughput without sacrificing particle alignment, suitable for imaging and cytometry applications.
Implementation Method 1
subjecting the fluid to acoustic radiation pressure
Implementation Method 2
at least one vibration source possessing a groove... The vibration source preferably comprises a piezoelectric material
Data Source
AI summary
The present invention is a method and apparatus for acoustic focusing hardware and implementations.