Wireless LC Sensor for Rapid Antimicrobial Susceptibility Testing
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Solution Overview
Problem
Current methods for detecting antibiotic susceptibility in bacterial infections are slow, often taking 1-2 days, and require complex equipment and extensive data processing, which hinders rapid diagnosis and treatment, especially in critical cases like sepsis, where timely antibiotic administration is crucial.
Innovation Solution
A wireless magnetically coupled LC sensor system that monitors bacterial growth and antibiotic susceptibility by measuring the resonance frequency and permittivity of bacterial cultures, allowing for rapid phenotypic AST without the need for targeted sample enrichment or complex sample preparation, enabling rapid diagnosis and treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional phenotypic methods (dilution methods, agar disk diffusion testing, gradient diffusion methods) are used for antimicrobial susceptibility testing, then reliable results are obtained, but the testing time is extended to 1-2 days
Solution Approach 1:
The patent replaces traditional mechanical/chemical AST methods with a magnetic sensing system. A magnetically coupled sensor detects changes in magnetic properties caused by bacterial growth and antibiotic effects, enabling rapid AST results within hours rather than days, while maintaining measurement reliability through quantitative magnetic signal analysis
Solution Approach 2:
The patent monitors dynamic changes in magnetic parameters (impedance, resonant frequency) of bacterial cultures exposed to antibiotics. By tracking these parameter changes over time, the system determines antibiotic susceptibility rapidly, resolving the contradiction between speed and reliability by using real-time parameter monitoring instead of endpoint readings
2Loss of time
If genotypic AST methods (qPCR, whole-genome sequencing, MALDI-TOF) are used to detect AMR biomarkers, then results are produced in hours with high sensitivity, but detailed knowledge of AMR gene sequences and data analysis in advance is required
Solution Approach 1:
The patent replaces complex genomic analysis systems with a simple magnetic sensor system. Instead of requiring qPCR, sequencing, or MALDI-TOF equipment with extensive bioinformatics processing, the system uses magnetic coupling sensors to directly detect bacterial responses to antibiotics, dramatically simplifying the device while maintaining rapid reporting capability
Solution Approach 2:
The magnetic sensor system requires no prior knowledge of specific AMR genes or sequences. The sensor automatically detects and quantifies bacterial susceptibility phenotypes through magnetic property changes, eliminating the need for pre-programmed genetic databases or complex data analysis pipelines required by genotypic methods
3Loss of time
If optical imaging, pH sensors, bioluminescent assays, or magnetic sensors with antibody coating are used for rapid detection, then detection speed is improved, but extensive image/data processing, complex sample preparation, and/or large equipment are required
Solution Approach 1:
The patent replaces optical imaging systems requiring extensive image processing, pH sensors requiring complex calibration and processing, and bioluminescent assays requiring specialized equipment with a simple magnetically coupled sensor system. The sensor provides direct electrical readout of bacterial responses without requiring image capture, processing, or complex sample preparation
Solution Approach 2:
The magnetic sensor system is universally applicable to various bacterial types and antibiotic classes without requiring specific sample preparation protocols or equipment adjustments. The same sensor platform can detect susceptibility to different antibiotics across various bacterial species, eliminating the need for method-specific preparation procedures required by other rapid detection technologies
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 rapid detection of antibiotic susceptibility within 30 minutes, reducing sepsis mortality and supporting antibiotic stewardship programs by providing a fast, cost-effective, and simple-to-operate solution for clinical settings.
Implementation Method 1
The magnetic coupling between sensor coil and the detection coil transmits AC electricity to the sensor circuit where the resonant frequency of the inductor (L) and capacitor (C) could be interpreted by analyzing the resonant frequency of the system on a frequency spectrum
Implementation Method 2
the resonant frequency of the inductor (L) and capacitor (C) could be interpreted by analyzing the resonant frequency of the system on a frequency spectrum. The resonant frequency changes in response to the surrounding environment, allowing the detection of substances that change the surface property of the sensor
Implementation Method 3
A bacterial culture may be diluted and aliquoted into a well plate having a sensor according to the present invention. A receiver coil connected to an impedance analyzer on the bottom of the well plate wirelessly communicates with the sensor and scans a spectrum of electrical wavelength to find the resonance frequency between the sensor and the receiver coil
Data Source
AI summary
An electrochemical biosensor based on magnetically coupled LC sensors for the rapid detection of microbial growth and sensitivity to microbials. The engineered LC sensors can be placed in 96 well plates and communicate the reading remotely with a receiver coil for signal analysis. The sensors were validated by testing the growth of Escherichia. coli, Staphylococcus. aureus, and Pseudomonas aeruginosa in the presence and absence of different antibiotics. Drug-resistant strains were used as controls. Bacterial growth was detected within 30 mins of culture inoculation, allowing rapid determination of antibiotic susceptibility at the phenotypic level. The pattern shown in the LC sensor AST is consistent with results collected with traditional optical density (OD) 600 nm measurement, additional validation was also performed with lysogeny broth (LB) dosed with fetal bovine serum (FBS). With the compatibility with 96-well plates, this rapid AST may be used for low-cost, point-of-care applications.