Piezoelectric Sensor Antimicrobial Susceptibility Testing
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Solution Overview
Problem
Current antimicrobial susceptibility testing methods require incubation and are time-consuming, lacking flexibility and accuracy, especially for rapidly growing bacteria and fungal organisms, and do not allow for rapid detection of microbial presence without growth.
Innovation Solution
A method using piezoelectric sensors to detect resonance peaks from live microbes, determining the width or standard deviation of these peaks to assess antimicrobial susceptibility and minimal inhibitory concentration (MIC) without the need for incubation, employing software for interpretive categories and database access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional antimicrobial susceptibility testing methods (broth dilution, disk diffusion, gradient diffusion) are used, then the testing can be performed with simple equipment and materials, but the testing time is long (overnight incubation required) and accuracy is insufficient for rapidly growing bacteria
Solution Approach 1:
The patent replaces the mechanical/biological incubation system with a piezoelectric sensor-based detection system. Instead of relying on microbial growth over time, the system uses piezoelectric sensors to directly detect microbial presence and stress responses, eliminating the need for incubation and enabling rapid testing within minutes while maintaining high accuracy.
Solution Approach 2:
The patent utilizes the piezoelectric effect, where mechanical stress from microbial cells on the sensor surface generates electrical signals. This phase transition from mechanical stress to electrical detection allows real-time monitoring of microbial presence and antimicrobial susceptibility without requiring temporal evolution through incubation.
2Adaptability or versatility
If conventional AST methods are used, then the test can be performed with pre-prepared panels and standardized procedures, but the method lacks flexibility for custom drug selections and cannot detect microbial presence without growth
Solution Approach 1:
The patent employs an array of multiple piezoelectric sensors, with each sensor capable of detecting different antimicrobial agents. This segmentation allows simultaneous testing of multiple drugs and concentrations across different sensors, providing flexibility in drug selection while maintaining rapid testing capability through parallel processing.
Solution Approach 2:
The piezoelectric sensors directly detect microbial presence and stress responses without requiring microbial growth or external reagents. The sensors themselves generate the detection signals through piezoelectric stress generation, eliminating the need for incubation and enabling immediate testing with flexible drug selection.
3Productivity
If piezoelectric sensors are used to detect resonance peaks from live microbes, then testing time is reduced significantly, but the device complexity increases
Solution Approach 1:
The piezoelectric sensor array serves multiple functions: detecting microbial presence, measuring microbial stress responses, determining antimicrobial susceptibility, and identifying minimum inhibitory concentrations. This multi-functionality consolidates what would otherwise require multiple separate testing systems into a single integrated platform, managing complexity through functional consolidation.
Solution Approach 2:
The patent uses an array of identical piezoelectric sensor units, each capable of performing the same detection function. This replication allows parallel testing of multiple samples and drugs while maintaining simplicity in each individual sensor unit, managing overall system complexity through modular duplication rather than complex integration.
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
Enables rapid, reliable detection of antimicrobial susceptibility and MIC determination, reducing testing time and improving accuracy by measuring minute stresses from live microbes, suitable for various microorganisms including bacteria and fungi.
Implementation Method 1
Rapid antimicrobial susceptibility testing using piezoelectric sensor
Implementation Method 2
detecting a resonance peak of a sensor with live microbes on a surface portion of the sensor
Data Source
AI summary
A system for and method of antimicrobial susceptibility testing includes detecting a resonance peak of a sensor provided with live microbes on a surface thereof; applying a substance to the live microbes; detecting a resonance peak of said sensor after application of said substance; determining a width of a top of each of said resonance peaks before and after application of the substance from one of: (1) a phase angle versus frequency plot where the phase angle is the phase angle of the electrical impedance of said sensor. (2) a real part of a plot of an electrical impedance versus frequency of said sensor. (3) a plot of a magnitude of electrical impedance versus frequency of said sensor, and (4) a phase angle versus frequency plot where the phase angle is the phase angle between an output voltage and an input voltage of said sensor, and comparing the determined widths of tops of said resonance peaks or standard deviations of the frequency of said resonance peaks to determine antimicrobial susceptibility including the minimum inhibitory concentration (MIC).