Lateral Flow Pump Housing Cup for Backflow Prevention
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Solution Overview
Problem
Lateral flow immunoassays face challenges in ensuring consistent and efficient fluid flow through the test strip, leading to variable results due to backflow and uneven pressure distribution, which affects the detection accuracy of analytes.
Innovation Solution
A lateral flow pump housing design that incorporates a cup or cover attached to the pump housing, applying a controlled pressure of at least 1000 Newtons per square meter to compress the absorbent pad, facilitating consistent fluid flow through the wicking pad and preventing backflow, thereby enhancing the lateral flow of solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no pressure is applied to the pump, then the device complexity is reduced, but the fluid flow consistency deteriorates due to backflow and uneven pressure distribution
Solution Approach 1:
The cup structure is nested within the pump housing cavity, creating a compact integrated design. The cup fits inside the base cavity and is attached to the side wall, eliminating the need for separate external pressure application mechanisms while maintaining the required compression force on the absorbent pad.
Solution Approach 2:
The cup acts as an intermediary component that translates the structural presence of the pump housing into controlled pressure on the absorbent pad. By attaching the cup to the side wall and positioning it within the cavity, the design mediates between the housing structure and the pump components to achieve uniform pressure distribution.
2Reliability
If a cup is added to apply pressure to the pump, then the fluid flow consistency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The cup is designed to engage with specific localized features on the pump housing side wall, concentrating the pressure application at the precise location needed for optimal absorbent pad compression. This localized engagement approach reduces the need for high precision across the entire housing structure.
Solution Approach 2:
The pump housing is segmented into functional zones: the base with cavity for housing components, the side wall with attachment features for the cup, and the cup itself as a separate pressure application element. This segmentation allows each component to be manufactured and assembled independently, reducing cumulative precision requirements.
3Object-affected harmful factors
If the cup exerts high pressure on the pump, then the backflow prevention is improved, but the absorbent pad compression may become excessive
Solution Approach 1:
The cup is designed to apply pressure that may initially appear excessive, but this ensures adequate backflow prevention under all operating conditions. The pressure application is partial in the sense that it targets only the absorbent pad region, allowing other pump components to maintain their natural compression characteristics.
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 design ensures consistent and efficient fluid flow, improving the accuracy of analyte detection by maintaining a controlled pressure and preventing backflow, resulting in reliable lateral flow immunoassay results.
Implementation Method 1
a sample is added to a sample application pad and then flows by capillary action to a conjugate release pad
Implementation Method 2
An absorbent pad (or 'pump') at the end of the test strip draws or wicks liquid through the test strip
Data Source
AI summary
Lateral flow device pump housings and methods of making such housings are provided.