Paper Test Kit with Powder Reagents for Safe Detection
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Solution Overview
Problem
Existing chemical and biological agents test kits face challenges in mass production due to hazardous materials, complex packaging, excessive reagent consumption, multi-step operations, and limited shelf life, making them costly and difficult to manufacture and use safely.
Innovation Solution
A portable presumptive test kit using paper with color change reagents and a pre-wetted swab with non-hazardous solvents, allowing for low-cost mass production and single-step operation, while eliminating hazardous reagents and sophisticated equipment requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hazardous liquid reagents are used in test kits, then detection capability is improved, but manufacturing safety and shipping restrictions worsen
Solution Approach 1:
The patent changes the physical state of reagents from liquid to powder form. This parameter change eliminates the hazards associated with liquid reagents (spills, splashes, aerosols) while maintaining detection capability. The powdered reagents are contained in ampoules that are broken during use to release the powder onto the test substrate.
Solution Approach 2:
The patent employs disposable ampoules containing powdered reagents that are broken during a single use. This approach eliminates the need for complex packaging and handling of hazardous liquids, as each ampoule is designed for one-time use only, improving manufacturing safety and reducing shipping restrictions.
2Ease of operation
If liquid dropper bottles and pressurized aerosol spray cans are used, then reagent delivery is improved, but device complexity and manufacturing cost worsen
Solution Approach 1:
The patent extracts the reagent from complex delivery systems (dropper bottles, pressurized aerosol cans) and places it directly into simple glass ampoules. The ampoules are broken during use to release the powdered reagent, eliminating the need for complex pumps, valves, and pressurization systems while maintaining effective reagent delivery.
Solution Approach 2:
The patent replaces complex mechanical delivery systems (pumps, valves, pressurization mechanisms) with a simple mechanical action of breaking an ampoule. This substitution dramatically reduces device complexity and manufacturing cost while maintaining ease of operation through the straightforward break-and-apply process.
3Ease of operation
If bibulous carriers are impregnated with reagent solutions, then reagent application is improved, but manufacturing cost and solvent removal complexity worsen
Solution Approach 1:
The patent changes the reagent form from dissolved solution to dry powder. This eliminates the need for solvent removal processes (evaporation, drying) that complicate manufacturing and increase costs. The powdered reagent is simply transferred from the ampoule to the test substrate where it dissolves in the sample liquid during use.
Solution Approach 2:
The patent extracts the reagent from the complex impregnation process and delivers it as a separate powdered component in an ampoule. This separation simplifies manufacturing by eliminating solvent handling and drying steps, while the reagent is applied to the substrate through a simple break-and-pour action during use.
4Strength
If injection die molded housings are used, then kit structure is improved, but manufacturing cost worsens
Solution Approach 1:
The patent employs simple, disposable paper-based substrates instead of expensive injection-molded plastic housings. The paper substrate provides sufficient structural support for the test function and can be manufactured at very low cost. The simplicity of the paper substrate also facilitates mass production and reduces tooling costs.
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 solution enables the production of millions of units per annum with a 2-3 year shelf life, reducing false detection rates and ensuring safe, efficient identification of chemical and biological agents with enhanced residue collection and simplified handling.
Implementation Method 1
paper with color change reagents applied to the surface as one or more test zones
Implementation Method 2
a pre-wetted swab with non-hazardous co-solvents to facilitate enhanced suspect residue collection
Data Source
AI summary
A highly portable, paper and swab-based detection kit is provided for identifying chemical and biological agents. A method of mass manufacture providing low cost kits with long term commercial shelf life and a method of use is also provided.