Retroreflective Microsphere Surface Marking for Cleaning Verification
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Solution Overview
Problem
Healthcare settings face challenges in monitoring the cleanliness of environmental surfaces effectively, as existing methods like UV dye marking systems are not easily observable during cleaning and do not provide a robust challenge for physical removal, which is crucial for disinfection.
Innovation Solution
A visual surface marking system using retroreflective microspheres that can be applied to surfaces, allowing for detection with visible light after cleaning, providing a semi-quantitative assessment of cleanliness and compliance with cleaning protocols without the need for specialized lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UV dye marking systems are used, then the marking is invisible during cleaning procedures, but the marking can be detected with black light after cleaning
Solution Approach 1:
The patent uses retroreflective microspheres that appear invisible or nearly invisible under ambient light during cleaning, but reflect light back to the observer when illuminated by a light source, creating a visible marking. This color/visibility change principle allows the marking to be covert during cleaning yet detectable during inspection.
Solution Approach 2:
The retroreflective microspheres act as an intermediary between the cleaning staff and the inspection process. During cleaning, they remain invisible to staff (covert), but when illuminated during inspection, they become visible to assess cleaning effectiveness. This intermediary property resolves the contradiction between visibility during cleaning and detectability after cleaning.
2Reliability
If UV dye marking systems are used, then the marking system can be applied to surfaces, but the marking does not provide a robust challenge for physical removal
Solution Approach 1:
The marking system uses composite retroreflective microspheres embedded in a carrier material. This composite structure provides both the retroreflective property for visibility and the physical robustness for challenging cleaning protocols. The microspheres themselves act as the challenging element that requires thorough physical removal, ensuring reliable assessment of cleaning effectiveness.
3Illumination intensity
If retroreflective microspheres are used instead of UV dye, then the marking system provides superior visibility with visible light, but the system requires a carrier for dispensing the microspheres
Solution Approach 1:
The carrier serves multiple functions: it holds the retroreflective microspheres for controlled application, facilitates easy dispensing onto surfaces, and can be designed to enhance the retroreflective properties of the microspheres. This multi-functionality justifies the added complexity by providing both application convenience and enhanced visibility.
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 system effectively determines the cleanliness of surfaces by measuring retroreflection, offering a more robust challenge for cleaning and providing superior visibility and quantifiability compared to UV-dye-based systems, enhancing the monitoring of environmental hygiene in healthcare settings.
Implementation Method 1
employ retroreflective microspheres, rather than a UV dye, and therefore do not require a specialized light source to determine cleaning results
Data Source
AI summary
Systems and methods for determining the cleanliness of a surface. Surface marking systems of the present disclosure can include a plurality of retroreflective microspheres dispersed in or dispensed on a carrier. Applicators of the present disclosure can include a container comprising the surface marking system, and a dispenser. Methods of the present disclosure can include applying the surface marking system to at least one discrete site on the surface; illuminating the at least one discrete site on the surface with visible light, after a cleaning; and detecting retroreflection emitted from the at least one discrete site on the surface in response to illuminating the at least one discrete site to determine the effectiveness of the cleaning of the surface.