Fluorescent Hand Soap for Washing Compliance
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Solution Overview
Problem
Existing hand soaps do not effectively indicate the completeness of hand washing, particularly in adhering to the 20-second washing guidelines set by the World Health Organization, and fail to ensure that soap residue is removed only by effective washing.
Innovation Solution
A soap formulation with a light-sensitive material that persists on the skin for at least 20 seconds, allowing activation by UV light or LEDs to indicate residual soap, ensuring thorough washing by adhering to the skin only during effective washing and rinsing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If soap is formulated to persist on hands for at least 20 seconds, then hand washing effectiveness can be monitored, but soap cannot be easily removed by insufficient washing
Solution Approach 1:
The patent incorporates light-sensitive materials (fluorescent dyes, pH indicators, or color-changing particles) into the soap formulation that change appearance based on washing duration and effectiveness. The soap maintains persistence on hands for at least 20 seconds as required by WHO guidelines, while the color change mechanism provides visual feedback to indicate whether adequate washing has occurred, resolving the contradiction between persistence and ease of removal assessment
Solution Approach 2:
The patent implements a feedback mechanism through light-sensitive materials that provide real-time visual information about washing effectiveness. The soap remains on hands during the required 20-second washing period, and the light-sensitive components activate or change state to indicate whether the washing was sufficient, allowing users to adjust their washing behavior based on the visual feedback
2Measurement precision
If light-sensitive material is added to indicate residual soap, then washing completeness can be detected, but soap formulation complexity increases
Solution Approach 1:
The patent uses light-sensitive materials that respond to physical or chemical parameters during washing (such as pH changes, moisture levels, or mechanical agitation) to indicate washing completeness. By selecting materials that respond to naturally occurring parameter changes during hand washing, the formulation achieves precise detection capability without requiring complex additional components or mechanisms
Solution Approach 2:
The light-sensitive materials act as intermediaries between the soap and the user's perception of washing effectiveness. These materials translate the physical state of the soap on hands into visible signals, providing a simple yet effective detection mechanism that does not require complex electronic or mechanical systems
3Ease of operation
If soap viscosity is optimized for automatic dispenser delivery, then automated delivery is enabled, but soap may not remain on hands long enough for effective washing
Solution Approach 1:
The patent formulates the soap with dynamic viscosity characteristics that allow it to flow easily during automatic dispenser delivery (responding to pump or squeeze forces) but then maintain persistence on the hands for at least 20 seconds. The formulation achieves this by selecting surfactants and thickening agents that provide shear-thinning behavior - low viscosity under mechanical stress during dispensing, but higher viscosity and adhesion when applied to skin
Solution Approach 2:
The soap formulation incorporates ingredients that change their physical properties based on environmental conditions. The viscosity and adhesion parameters are optimized to allow easy dispensing in automated systems while maintaining sufficient persistence on hands for the required 20-second washing period, achieving both automated delivery capability and adequate residence time
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
Enables users to determine the effectiveness of hand washing by fluorescence, ensuring thorough removal of bacteria and viruses, and improving hand hygiene compliance with the WHO guidelines.
Implementation Method 1
the light sensitive material in the soap is a material that fluoresces when subjected to Ultra Violet (UV) light particularly UVA light
Data Source
AI summary
A soap for hand washing is provided that contains a material that fluoresces when exposed to light such as ultra violet light, the hands are subjected to the light after washing and any fluorescence can indicate inadequate washing, the soap can be used to determine if World Health Organisation guidelines for washing have been adhered to.