Hydrophilic Sampling Article with Scouring Layer for Microbial Collection
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Solution Overview
Problem
Existing sampling devices often fail to accurately collect microorganisms from surfaces, particularly biofilms, due to inadequate pickup mechanisms and the potential for microbial killing by biocides or abrasives, leading to false negatives in microbial detection.
Innovation Solution
A sampling article comprising a hydrophilic, absorbent inner layer and porous, hydrophilic outer layers with a scouring layer, designed to effectively dislodge and collect microorganisms without killing them, featuring a non-woven structure with specific solids content and pore sizes to ensure sample integrity and easy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If biocides or harsh abrasives are used in sampling devices to kill microorganisms, then microbial detection accuracy is improved, but sample integrity deteriorates due to false negatives
Solution Approach 1:
The patent applies this principle by using mild abrasives that mechanically dislodge biofilms and microorganisms from surfaces without killing them. The abrasive action is converted from a potentially harmful force into a beneficial mechanism for sample collection, achieving both effective pickup and preservation of microbial viability for accurate detection and culture.
Solution Approach 2:
The patent changes the parameters of the sampling device by using materials with specific properties: mild abrasives with controlled hardness, biocide-free composition, and hydrophilic absorbent materials with optimized pore sizes (1-10 micrometers). These parameter changes enable effective microbial collection while maintaining sample integrity and avoiding false negatives.
2Ease of operation
If conventional sampling devices are used to collect microorganisms from surfaces, then sample collection is simplified, but pickup effectiveness deteriorates especially for biofilms
Solution Approach 1:
The sampling device uses a composite structure combining multiple materials with complementary properties: a nonwoven substrate providing structural integrity, hydrophilic absorbent materials for effective microbial pickup, and mild abrasive particles for biofilm dislodgement. This composite approach maintains ease of operation while significantly improving pickup effectiveness for challenging surfaces like biofilms.
Solution Approach 2:
The patent employs porous hydrophilic absorbent materials with controlled pore sizes (1-10 micrometers) that effectively trap and retain microorganisms during the sampling process. The porous structure provides high surface area for microbial adhesion while maintaining ease of device operation and sample release.
3Ease of operation
If porous structures are used to facilitate sample release, then release ease is improved, but structural strength deteriorates
Solution Approach 1:
The patent resolves this contradiction by creating a composite material system where a strong nonwoven substrate provides structural integrity, while integrated porous hydrophilic layers provide easy sample release. The combination allows the device to maintain sufficient strength for handling while enabling effortless sample transfer to culture media through the porous structure.
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 accurate collection and release of microorganisms, reducing false negatives and maintaining sample integrity by avoiding biocides and harsh abrasives, thus ensuring reliable microbial detection and culture.
Implementation Method 1
a hydrophilic, absorbent inner layer... porous, hydrophilic outer layers... designed to effectively dislodge and collect microorganisms
Implementation Method 2
scouring layer, designed to effectively dislodge and collect microorganisms
Data Source
Figure 1~2
Figure 3~4
AI summary
Article for sampling comprising inner layer, one or more outer layers, and optional scouring layer on a portion of the one or more outer layers.