Flow Cytometry TB Detection Method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for diagnosing tuberculosis, especially in resource-poor settings and among HIV-infected individuals, face challenges such as low sensitivity, long turnaround times, and the need for biosafety infrastructure, making rapid and accurate identification of Mycobacterium tuberculosis difficult.
Innovation Solution
A method using flow cytometry to identify and quantify Mycobacterium tuberculosis in sputum samples by analyzing angular fluorescence and side scatter properties, which can be performed quickly and without requiring specialized equipment or skilled personnel, and can be used to generate calibration and verification materials for quality control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If smear microscopy is used for TB diagnosis, then the method is cheap and easy to perform, but the sensitivity is poor (35 to 80%) especially in HIV-infected individuals
Solution Approach 1:
The patent replaces the mechanical/optical microscopy system with a flow cytometry system that uses fluorescence detection. Instead of visually examining stained smears under a microscope, the system uses fluorescently labeled antibodies that bind to Mycobacterium tuberculosis antigens, and flow cytometry detects these fluorescent signals automatically, providing higher sensitivity while maintaining operational simplicity.
Solution Approach 2:
The patent employs fluorescent labeling where antibodies conjugated with fluorescent dyes (such as FITC, PE, or other fluorophores) bind to specific antigens on Mycobacterium tuberculosis. When exposed to specific wavelengths of light, these antibodies emit fluorescent signals that can be detected by flow cytometry, enabling highly sensitive detection of the bacteria in sputum samples.
2Measurement precision
If culture method is used for TB diagnosis, then the sensitivity is high and drug resistance can be identified, but the turnaround time is long (2 to 6 weeks) and requires biosafety infrastructure
Solution Approach 1:
The patent performs preliminary detection using flow cytometry with fluorescently labeled antibodies that can identify Mycobacterium tuberculosis within hours rather than weeks. This preliminary action provides rapid results for clinical decision-making, while culture methods can still be used subsequently for confirmation and drug susceptibility testing if needed.
Solution Approach 2:
The patent substitutes the slow cultural growth process with a direct immunodetection method using flow cytometry. Instead of waiting for bacteria to grow on culture media over weeks, the system directly detects bacterial antigens in the sample using fluorescent antibodies, dramatically reducing turnaround time while maintaining high sensitivity.
3Measurement precision
If culture method is used for TB diagnosis, then the sensitivity is high, but it requires biosafety infrastructure (BSL 2 to 3) which cannot be implemented easily in decentralized resource poor settings
Solution Approach 1:
The patent uses disposable fluorescently labeled antibodies and single-use flow cytometry protocols that do not require maintaining complex biosafety infrastructure. The reagents are pre-prepared and stable, and the testing can be performed in simpler laboratory settings without BSL-2 or BSL-3 facilities, making it suitable for decentralized resource-poor settings while maintaining high sensitivity.
4Productivity
If rapid diagnosis is implemented, then transmission rate can be minimized, but current methods either have low sensitivity or require complex infrastructure
Solution Approach 1:
The patent replaces slow diagnostic methods with flow cytometry-based immunodetection that provides rapid results within hours. The system uses fluorescently labeled antibodies that bind specifically to Mycobacterium tuberculosis antigens, and flow cytometry detects these signals quickly and sensitively, enabling rapid diagnosis that can minimize transmission while maintaining high sensitivity.
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 allows for rapid identification of tuberculosis within 24 hours, reduces the need for biosafety infrastructure, and provides a cost-effective solution for decentralized diagnosis, improving sensitivity and reducing the risk of transmission.
Implementation Method 1
identifying the presence or absence of events within a region of increased angular fluorescence and increased angular side (SS) or forward scatter (FS)
Implementation Method 2
identifying the presence or absence of events within a region of increased angular fluorescence and increased angular side (SS) or forward scatter (FS)
Data Source
AI summary
This invention describes a method for identifying bacteria. In particular, this invention relates to a method for identifying and quantifying mycobacteria from a sputum sample taken from a subject using flow cytometry. Further described is the use of flow cytometry to identify and quantify Mycobacterium tuberculosis from sputum-derived samples. Once identified and quantified, the samples are spotted onto filter cards for use in verification of an existing method of diagnosis, calibration of an existing method of diagnosis and/or the establishment of an external quality control system for use in conjunction with these methods of diagnosis. In one embodiment the method is used to diagnose tuberculosis (TB).