Lateral Flow Cassette Gating Mechanism
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Solution Overview
Problem
Existing self-administered lateral flow immunoassay tests require multiple steps for sample preparation, are prone to human error, and may not ensure accurate results due to the need for external reagent mixing and manual handling of samples.
Innovation Solution
A cassette device with a built-in reservoir for reagents that mixes with the sample without the need for external containers, featuring a gating mechanism to control fluid flow onto a test strip, simplifying the process and reducing human error, while ensuring accurate and user-friendly testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate container and manual mixing method are used for reagent solution, then the device complexity is reduced, but the reliability of test results deteriorates due to human error and improper mixing
Solution Approach 1:
The patent merges the reagent storage reservoir, mixing chamber, and test strip application area into a single integrated cassette device. The reservoir is positioned within the housing to directly receive sample material, eliminating the need for separate external containers and manual mixing steps. This integration ensures consistent reagent-sample mixing while maintaining a compact, user-friendly device structure.
Solution Approach 2:
The cassette device is designed to automatically mix the reagent solution with the sample material without requiring user intervention. The reservoir structure and internal geometry enable passive mixing through capillary action or gravity-driven flow, eliminating human error associated with manual mixing while keeping the device simple to operate.
2Ease of operation
If multiple steps for sample preparation are required, then the ease of operation deteriorates, but the manufacturing precision and control over the testing process improve
Solution Approach 1:
The reagent solution is pre-loaded into the reservoir during manufacturing, and the cassette is pre-assembled with the test strip in the correct position. When the user introduces the sample material into the reservoir, the pre-configured structure immediately begins the mixing and testing process, eliminating multiple preparation steps and reducing the time required for sample preparation.
Solution Approach 2:
The patent combines sample introduction, reagent mixing, and test application into a single continuous operation within the integrated cassette. The user performs one action of introducing the sample into the reservoir, and the device automatically completes mixing and directs the reagent-sample mixture onto the test strip, significantly reducing the number of steps and time required compared to traditional multi-step procedures.
3Loss of substance
If external containers are used for sample and reagent, then the device complexity is reduced, but the loss of substance increases due to transfer and handling
Solution Approach 1:
The patent integrates the reagent reservoir directly within the cassette housing, positioned to receive sample material and immediately mix with the reagent solution. This eliminates the need to transfer samples between external containers, preventing loss of substance during handling while maintaining a manageable device size through efficient spatial arrangement.
Solution Approach 2:
The design extracts the mixing function from external containers and incorporates it directly into the cassette structure. The reservoir is configured to perform mixing in-situ, removing the need for separate external mixing vessels and minimizing the number of transfer operations, thereby reducing substance loss while keeping the overall device compact and integrated.
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 solution simplifies sample preparation, enhances test validity, improves result quality, and increases user safety by integrating reagent mixing and fluid control within the cassette device, reducing the number of steps and potential for error.
Implementation Method 1
The gating device can include a sealing portion that selectively seals an opening defined in a base of the receptacle
Implementation Method 2
lateral flow immunoassay (LFIA) paper-based tests
Data Source
AI summary
The subject matter disclosed herein includes a cassette device for lateral flow immunoassay testing, including a housing; a receptacle located on a top portion of the housing; and a gating device. The housing defines an interior space to accommodate a test strip. The receptacle is arranged to hold a fluid above the test strip. The gating device includes a sealing portion that selectively seals an opening defined in a base of the receptacle. The gating device is configured to be actuated between (i) a first position in which the sealing portion engages the opening in the base of the receptacle to form a seal and (ii) a second position in which the sealing portion disengages the opening in the base of the receptacle to break the seal.