Thin Test Strip Structure to Reduce Deformation and Discomfort
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Solution Overview
Problem
Conventional colloidal gold test strips used in sanitary products cause a strong foreign body sensation due to their rigid plastic bottom layer, leading to deformation and inaccurate test results.
Innovation Solution
A thin test strip design featuring a waterproof top and bottom layer with an I-shaped composite layer, including a sample collection pad, colloidal gold conjugate pad, and color developing membrane, where the top and bottom layers are made of PET waterproof membranes, reducing thickness to 0.03-0.06 mm, and optimizing pad dimensions for improved accuracy and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid plastic bottom layer is used in conventional test strips, then structural stability is improved, but foreign body sensation and deformation are worsened
Solution Approach 1:
The patent removes the rigid plastic bottom layer from the test strip structure entirely. The test strip consists of a sample pad, colloidal gold conjugate pad, nitrocellulose membrane, and absorbent pad laminated together without any plastic substrate, thereby eliminating the foreign body sensation while maintaining structural integrity through the layered membrane structure itself.
Solution Approach 2:
The patent replaces the rigid plastic structure with thin, flexible membrane layers. The nitrocellulose membrane and other porous membranes provide the necessary structural support while being thin and flexible, allowing the test strip to conform to the sanitary product surface without causing discomfort or deformation.
2Object-affected harmful factors
If the plastic bottom layer is removed to reduce foreign body sensation, then foreign body sensation is improved, but test accuracy deteriorates due to deformation
Solution Approach 1:
The patent divides the test strip into distinct functional segments (sample pad, colloidal gold conjugate pad, nitrocellulose membrane, absorbent pad) that are laminated together. Each layer performs a specific function and the segmented structure prevents deformation by distributing mechanical stress across multiple thin layers rather than relying on a single rigid substrate.
Solution Approach 2:
The patent creates a composite structure by laminating multiple functional membranes and pads together. The combination of different materials (cellulose, nitrocellulose, colloidal gold, absorbent materials) provides both structural stability and the necessary functional properties for accurate testing, eliminating the need for plastic support while maintaining test accuracy.
3Object-affected harmful factors
If test strips are made thin and flexible, then foreign body sensation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functional layers into a single integrated test strip structure. The sample pad, colloidal gold conjugate pad, nitrocellulose membrane, and absorbent pad are laminated together in one manufacturing process, eliminating the need for separate plastic substrate production and assembly steps, thereby simplifying manufacturing despite the thin flexible design.
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 minimizes foreign body sensation while ensuring accurate test results by preventing deformation and enhancing sample transfer, improving processing efficiency and reducing costs by allowing the test strips to be integrated into rolls.
Implementation Method 1
a sample pad, a colloidal gold conjugate pad, a nitrocellulose (NC) membrane, and an absorbent pad are sequentially lap-jointed
Data Source
AI summary
The present disclosure relates to the technical field of tests, and in particular, to a thin test strip, a test strip roll, and an application of the thin test strip. The thin test strip includes: a waterproof top layer, a composite layer, and a waterproof bottom layer in sequence from top to bottom, where the composite layer includes a sample collection pad, a colloidal gold conjugate pad, a color developing membrane, and a sample absorption pad, the waterproof top layer does not cover the sample collection pad and completely covers the colloidal gold conjugate pad, the color developing membrane, and the sample absorption pad, and the composite layer is I-shaped. The waterproof top layer and the waterproof bottom layer are made from polyethylene terephthalate (PET) waterproof transparent membranes.