Urine Testing Kit PVA Film Cover for Moisture and Interference Control
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Solution Overview
Problem
Existing urine testing kits face challenges such as humidity exposure, reagent reaction non-uniformity, and interference between test items, which affect accuracy and lead to unsanitary conditions when used urine strips are stored for long periods.
Innovation Solution
A urine testing kit with a reagent paper seated in a seating groove on a substrate part, covered by a hydrophilic and biodegradable cover part with pore holes that facilitate urine inflow and minimize humidity effects, ensuring uniform reagent reaction and easy disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a desiccant is used to protect test strips from humidity, then moisture-proof efficiency is improved, but the device complexity increases and the desiccant requires additional packaging space
Solution Approach 1:
The patent uses a flexible PVA film cover part that acts as a moisture barrier while allowing fluid penetration. This thin film structure protects the reagent paper from humidity without requiring bulky desiccants or complex packaging, directly resolving the contradiction between moisture protection and device simplicity.
Solution Approach 2:
The PVA film exhibits different properties in different locations: it is hydrophobic to external humidity (protecting the reagent) but becomes hydrophilic when contact with urine (allowing fluid inflow through pore holes). This local quality differentiation eliminates the need for separate desiccant components while maintaining both protection and functionality.
2Duration of action of stationary object
If urine test strips are stored for long time after use, then storage convenience is improved, but unsanitary problems such as bad odor and contamination occur
Solution Approach 1:
The patent employs a disposable PVA film cover that is discarded immediately after use. This eliminates long-term storage requirements and associated sanitation issues, as the used cover with potential contaminants is thrown away rather than stored. The low cost of the PVA film makes this single-use approach economically viable.
Solution Approach 2:
The system is designed for immediate discarding of the PVA film cover after urine testing. By discarding the cover right after use rather than storing it, the patent prevents contamination and bad odor problems while maintaining storage convenience through a simple dispose-and-replace process.
3Object-affected harmful factors
If the cover part is made hydrophobic to prevent humidity ingress, then moisture protection is improved, but fluid inflow capability deteriorates
Solution Approach 1:
The PVA film transitions from a hydrophobic state (when dry and protecting against humidity) to a hydrophilic state (when contact with urine, allowing fluid inflow). This dynamic property change enables the same material to perform both moisture protection and fluid delivery functions, resolving the contradiction between these opposing requirements.
Solution Approach 2:
The cover part exhibits different wettability properties in different conditions: hydrophobic to external humidity but hydrophilic to urine. This local quality differentiation allows the single-layer PVA film to simultaneously prevent humidity ingress while facilitating urine inflow through the pore holes, eliminating the need for separate hydrophobic and hydrophilic layers.
4Area of stationary object
If multiple test strips are placed close together, then device compactness is improved, but interference between test items occurs
Solution Approach 1:
The PVA film cover creates separate enclosed spaces for each test strip, with individual pore holes leading to each seating groove. This segmentation prevents cross-contamination and interference between adjacent test items while maintaining compact device area, as each test strip is isolated in its own micro-environment under the flexible cover.
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 kit minimizes humidity effects, enhances reagent reaction uniformity, prevents interference between test items, and allows for immediate sewage disposal after use, thereby improving testing accuracy and hygiene.
Implementation Method 1
a pore hole may be formed in the cover part through which the urine sprayed on an upper surface of the cover part is injected into the seating groove
Implementation Method 2
a material of the cover part may be a hydrophilic and biodegradable material including PVA film
Data Source
AI summary
The present invention relates to a urine testing kit. The objective of the present invention is to provide a urine testing kit in which the effects of humidity, non-uniformity of reagent reactions, and interference between items are minimized, and fluid can easily flow into the kit, thus increasing the reaction efficiency with urine.