Bioluminescent Assay for Rapid Antibiotic Susceptibility Testing
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Solution Overview
Problem
Current methods for determining bacterial infections and antibiotic susceptibility at the point of care are complex, require specialized training, and are impractical within the time frame of a typical clinical visit, often leading to inappropriate antibiotic prescriptions and increased bacterial resistance.
Innovation Solution
A method using a bioluminescent assay that involves applying specific reagents to a sample to remove non-bacterial ATP, release bacterial ATP, and measure bioluminescent signals to determine infection presence and antibiotic susceptibility within 60 minutes, allowing for effective antibiotic selection at the point of care without complex equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bacterial culture and susceptibility testing methods are used, then accurate determination of bacterial infection and antibiotic susceptibility can be achieved, but the process requires specialized training, expensive equipment, and takes hours to days making it impractical for point of care use
Solution Approach 1:
The patent replaces complex mechanical and biochemical laboratory systems with a simplified bioluminescence-based detection system. Instead of using traditional culture methods requiring incubators, microscopes, and specialized media, the invention uses ATP bioluminescence assay that can be performed with minimal equipment. The luciferase-luciferin-ATP reaction provides a direct, quantifiable signal that eliminates the need for complex imaging and analysis equipment, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent changes the detection parameter from visual inspection of bacterial growth (traditional culture method) to measurement of bioluminescence intensity. By measuring the light output from the luciferase reaction, which is proportional to ATP concentration and thus bacterial load, the system transforms a complex qualitative assessment into a simple quantitative measurement. This parameter change enables accurate bacterial detection and antibiotic susceptibility determination using basic photodetection equipment rather than complex laboratory instrumentation.
2Reliability
If traditional culture-based susceptibility testing is performed, then reliable antibiotic susceptibility results can be obtained, but the testing process requires hours to days which exceeds the time frame of a typical clinical visit
Solution Approach 1:
The patent performs preliminary action by directly measuring ATP from bacterial cells immediately after sample collection, without waiting for bacterial culture growth. The bioluminescence assay detects ATP present in the original sample or after brief incubation with antibiotics, providing susceptibility results within minutes rather than hours or days. This preliminary detection approach eliminates the lengthy culture phase while maintaining reliability by directly assessing bacterial metabolic activity and response to antibiotics.
Solution Approach 2:
The patent skips the traditional extended culture and observation phases by using ATP bioluminescence as a direct proxy for bacterial presence and susceptibility. Instead of allowing bacteria to grow on agar plates for 24-48 hours and then observing colony formation, the invention rushes through the process by measuring ATP levels immediately, providing rapid susceptibility results that fit within the clinical visit timeframe while maintaining reliability through the specificity of the bioluminescence assay.
3Productivity
If ATP bioluminescence assay is used to rapidly detect bacteria, then results can be obtained quickly, but non-bacterial ATP in the sample creates background interference that reduces measurement accuracy
Solution Approach 1:
The patent applies the extraction principle by selectively removing or neutralizing non-bacterial ATP from the sample before performing the bioluminescence assay. The method uses specific treatments such as protease digestion to break down cellular ATP from host cells while preserving bacterial ATP, or uses differential extraction techniques to separate bacterial and host ATP. This extraction step eliminates background interference, allowing the assay to specifically detect bacterial ATP and maintain high measurement precision while preserving the rapid productivity of the method.
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 and accurate detection of bacterial infections and antibiotic susceptibility, reducing inappropriate antibiotic use and bacterial resistance by providing effective treatment options during clinical visits.
Implementation Method 1
measuring a bioluminescent signal from the first test sample based on released ATP
Implementation Method 2
applying a second reagent to the first test sample to release ATP from bacterial cells... wherein the second reagent comprises luciferase, luciferin
Data Source
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AI summary
A method for determining whether bacteria in a sample obtained from a subject at a point of care in a clinical setting is susceptible to an antibiotic, within a time period associated with a point of care. The method includes measuring a bioluminescent indication from a first test sample based on released ATP to determine a characteristic associated with the bioluminescent indication and comparing the characteristic associated with the bioluminescent indication to a first threshold. The method includes determining whether a bacteria is present by comparing the difference between a characteristic associated with a first confirmatory bioluminescent signal and a characteristic associated with a second confirmatory bioluminescent signal to an confirmatory threshold. The method includes determining that bacteria is susceptible to an antibiotic by comparing a difference between a characteristic associated with a second bioluminescent signal and a characteristic associated with the first bioluminescent signal to a second threshold.