Far-UVC Hand Disinfection Housing for Safe Pathogen Inactivation
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Solution Overview
Problem
Conventional disinfection methods are ineffective against drug-resistant bacteria and viruses, and UVC wavelengths harmful to humans pose safety risks in occupied spaces.
Innovation Solution
A hand disinfection device using far-UVC lamps emitting 207-222 nm light, with safety features like mirrors, shields, and a control system to ensure safe exposure times, allowing disinfection without harming human skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional disinfection methods are used, then the process is simple and safe, but effectiveness against drug-resistant bacteria and viruses is poor
Solution Approach 1:
The patent changes the wavelength parameter of UVC light from conventional 254 nm to far-UVC 222 nm, which fundamentally alters the interaction with biological materials. This parameter change enables effective disinfection of drug-resistant pathogens while maintaining safety for human skin, resolving the contradiction between effectiveness and simplicity.
2Reliability
If 254 nm UVC light is used for disinfection, then antimicrobial effect is achieved, but harm to human cells occurs
Solution Approach 1:
The patent shifts the UVC wavelength parameter from 254 nm to 222 nm, which changes the absorption characteristics. At 222 nm, the light is strongly absorbed by the outer layers of human skin (stratum corneum and tear layer) before reaching living cells, thereby maintaining antimicrobial effectiveness while eliminating harm to human cells.
Solution Approach 2:
The patent converts the potentially harmful property of strong light absorption in human skin into a protective benefit. The strong absorption at 222 nm by the outer skin layers prevents the light from reaching living cells, transforming what could be a harmful effect into a safety mechanism that protects human tissue while still enabling effective disinfection.
3Object-affected harmful factors
If far-UVC light at 222 nm is used, then safety for human cells is achieved, but device complexity increases due to specialized lamps and control systems
Solution Approach 1:
The patent introduces a transparent guard as an intermediary component between the far-UVC lamp and the user's hand. This guard allows UVC light to pass through while preventing direct contact between the lamp and skin, adding a layer of safety without significantly increasing device complexity.
Solution Approach 2:
The patent incorporates a control system with sensors that detect hand presence and monitor exposure conditions. This feedback mechanism automatically adjusts lamp operation to ensure safe exposure times, managing the complexity through intelligent control rather than additional physical components.
4Reliability
If exposure time is increased to enhance disinfection, then pathogen inactivation improves, but risk of harm to human skin increases
Solution Approach 1:
The patent changes the wavelength parameter to 222 nm, which fundamentally alters the dosing relationship. At this wavelength, the strong absorption by outer skin layers allows for longer effective exposure times to achieve pathogen inactivation while the same extended exposure only increases absorption in the non-living outer layers, not in living skin cells.
Solution Approach 2:
The patent employs sensors and control systems that continuously monitor exposure conditions and provide feedback to adjust lamp operation. This feedback mechanism ensures that exposure times are optimized for pathogen inactivation while automatically preventing excessive exposure that could harm human skin, resolving the contradiction between disinfection effectiveness and safety.
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
Effectively disinfects hands by inactivating pathogens while minimizing harm to human cells, suitable for use in populated areas like hospitals and offices.
Implementation Method 1
when UVC reaches the nucleic acids after penetrating the cell wall, adjacent thymine undergo dimerization, which causes a kink or a bend in the DNA strand preventing DNA replication
Implementation Method 2
Light is strongly absorbed by biological materials. Consequently, light does not have the ability to penetrate even the outermost layers of human skin
Implementation Method 3
far UVC light having a wavelength in the range 207 nm and 222 nm effectively kills drug-resistant bacteria while showing no apparent harm to exposed mammalian skin because light is strongly absorbed by biological materials, which limits the ability of the light to penetrate even the outermost layers of human skin
Data Source
AI summary
A hand disinfection device (HDD) that includes a housing having a least one opening that is sized to permit entry of a human hand into the housing; and two oppositely disposed UV lamps that are spaced far enough to permit the human hand to be located therebetween without making direct contact with the UV lamps each emitting UVC in the wavelength range 207-222 nanometers