Lateral Flow Swab Kit for Explosive Residue Detection
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Solution Overview
Problem
Current methods for detecting explosives are inefficient in identifying trace quantities in real-time and are not suitable for field use, as they require large and expensive equipment or trained animals, and often result in false positives due to lack of sensitivity and specificity.
Innovation Solution
A portable, disposable inspection tester system using a lateral flow membrane swab unit with two explosives detecting reagents, where the swab is swiped across a suspect surface, and the reagents are activated to produce a colorimetric response indicating the presence of explosives, allowing for rapid and sensitive detection of a broad range of explosive residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vapor detection methods are used, then detection capability is achieved, but the methods suffer from low vapor pressures of most explosives making them ineffective
Solution Approach 1:
The patent introduces a chemical reagent as an intermediary that reacts with explosive residues on surfaces. Instead of detecting explosives directly through their low vapor pressure, the reagent mediates the detection process by producing a visible color change when it reacts with trace explosive particles, thereby overcoming the limitation of low vapor pressure
Solution Approach 2:
The patent replaces physical/vapor-based detection mechanisms with a chemical reaction-based system. Instead of relying on the mechanical/physical property of vapor pressure, the system uses chemical reactions between reagents and explosive residues to produce detectable color changes, substituting one detection paradigm for another more effective one
2Measurement precision
If bulk detection methods are used, then detection of explosives is achieved, but large and expensive instrumentation is required
Solution Approach 1:
The patent extracts the detection function from large, complex bulk detection instruments and concentrates it into a small, portable test card. By taking out only the essential detection chemistry and placing it on a compact card format, the system eliminates the need for large instrumentation while maintaining detection capability
Solution Approach 2:
The patent employs disposable test cards that are inexpensive and single-use. Each card contains pre-loaded reagents that react with explosives and are then discarded, eliminating the need for expensive, maintainable instrumentation while providing reliable detection results
3Measurement precision
If tagging methods are used, then detection of explosives is achieved, but reliability is reduced because tagging is not mandatory
Solution Approach 1:
The patent performs preliminary action by pre-loading the test card with detection reagents before use. The reagents are prepared and positioned on the card in advance, ready to react immediately upon contact with explosive residues, eliminating the need for tagging explosives beforehand
4Measurement precision
If trace quantity detection is achieved, then sensitivity is improved, but false positives increase due to lack of specificity
Solution Approach 1:
The patent applies local quality by using multiple reagents with different specificities on the same test card. Each reagent targets specific classes of explosives (e.g., nitroaromatics, nitramines, nitrate esters), allowing the system to maintain high sensitivity while reducing false positives through differentiated reaction patterns
Solution Approach 2:
The patent uses color changes as the detection mechanism, where different reagents produce distinct color responses when reacting with different explosive types. This visual differentiation allows operators to identify not only the presence of explosives but also their specific class, thereby reducing false positives while maintaining 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
The system provides fast, sensitive, and cost-effective detection of explosives with low false positives, capable of detecting residues as low as 0.1 to 100 nanograms, suitable for field use by non-technical personnel, and can identify common military and industrial explosives.
Implementation Method 1
the reagents are activated to produce a colorimetric response indicating the presence of explosives
Data Source
AI summary
An explosion tester system comprising a body, a lateral flow membrane swab unit adapted to be removeably connected to the body, a first explosives detecting reagent, a first reagent holder and dispenser operatively connected to the body, the first reagent holder and dispenser containing the first explosives detecting reagent and positioned to deliver the first explosives detecting reagent to the lateral flow membrane swab unit when the lateral flow membrane swab unit is connected to the body, a second explosives detecting reagent, and a second reagent holder and dispenser operatively connected to the body, the second reagent holder and dispenser containing the second explosives detecting reagent and positioned to deliver the second explosives detecting reagent to the lateral flow membrane swab unit when the lateral flow membrane swab unit is connected to the body.