Microwave PPE Decontamination Vessel Using Low-Peroxide Heat
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Solution Overview
Problem
The COVID-19 pandemic has created a dangerous gap in the supply of disposable facemasks and personal protection equipment (PPE), leading to cross-contamination hazards and mask breakthroughs, as existing decontamination methods are time-consuming, use hazardous chemicals, or risk equipment damage.
Innovation Solution
A low-cost thermo-chemical decontamination process using a containment vessel that combines low-concentration hydrogen peroxide solution with heat, sealed in a microwave oven, to decontaminate PPE effectively and safely, avoiding toxic concentrations and equipment damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional decontamination methods are used, then pathogen inactivation is achieved, but the process is time-consuming and may damage equipment
Solution Approach 1:
The patent changes the physical-chemical parameters of the decontamination process by using low-concentration hydrogen peroxide (3-6%) instead of traditional high-temperature steam or chemical sterilants. The microwave heating method also changes the energy delivery parameters, enabling rapid heating to the optimal temperature range (65-80°C) that inactivates pathogens while preserving PPE integrity within 3-5 minutes.
Solution Approach 2:
The invention combines hydrogen peroxide chemical disinfection with microwave thermal heating to create a composite decontamination approach. This synergistic combination allows the chemical agent to work more effectively at lower temperatures while the microwave energy provides rapid, uniform heating, achieving pathogen inactivation faster than either method alone would permit.
2Reliability
If high concentration hydrogen peroxide is used for decontamination, then pathogen inactivation is improved, but toxic hazards increase
Solution Approach 1:
The patent fundamentally changes the concentration parameter of hydrogen peroxide from traditional high concentrations (35% or higher) to low concentrations (3-6%), which are comparable to common household solutions. This parameter change maintains decontamination effectiveness when combined with microwave heating while dramatically reducing toxicity and safety hazards for healthcare workers.
Solution Approach 2:
The invention converts the typically harmful effect of high hydrogen peroxide concentration (toxicity) into a benefit by using low concentration combined with controlled microwave heating. The microwave energy compensates for the lower chemical concentration, enabling effective pathogen inactivation without the toxic hazards associated with concentrated peroxide solutions.
3Reliability
If high temperature heating is used for decontamination, then pathogen inactivation is improved, but PPE integrity is compromised
Solution Approach 1:
The patent changes the temperature parameter from traditional high-temperature sterilization methods (121°C or higher for autoclaving) to a lower temperature range (65-80°C). This parameter change is sufficient for pathogen inactivation when combined with microwave heating and hydrogen peroxide, while preserving the structural integrity of heat-sensitive PPE materials like elastomers and plastics.
Solution Approach 2:
Hydrogen peroxide acts as an intermediary that enhances pathogen inactivation at lower temperatures. The chemical disinfection mechanism of hydrogen peroxide works synergistically with the thermal effect of microwave heating, enabling effective decontamination at 65-80°C rather than requiring high temperatures that would damage PPE materials.
4Reliability
If traditional decontamination equipment is used, then decontamination effectiveness is achieved, but device complexity and cost increase
Solution Approach 1:
The invention makes the microwave oven multi-functional by enabling it to serve both its traditional heating purpose and as a decontamination device. By placing a simple containment vessel with PPE and hydrogen peroxide inside the microwave, the existing appliance performs sterilization functions without requiring dedicated complex decontamination equipment, thereby reducing device complexity and cost.
Solution Approach 2:
The patent uses a simple, inexpensive containment vessel (such as a glass jar or plastic container) that can be easily manufactured or obtained. This simple vessel replaces complex dedicated decontamination chambers, making the overall system low-cost and accessible to healthcare facilities of all sizes without requiring investment in expensive specialized equipment.
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 process achieves rapid and effective decontamination of PPE at lower temperatures, preserving equipment integrity while ensuring pathogen inactivation, using commercially available materials and equipment.
Implementation Method 1
heating the containment vessel to allow air in the containment vessel to be substantially replaced with vapor
Implementation Method 2
decontaminating the one or more pieces of personal protection equipment by heating the one or more pieces of personal protection equipment in the sealed containment vessel using a microwave oven
Implementation Method 3
opening the pressure-relief valve of the containment vessel to release a pressure within the interior space after the one or more pieces of personal protective equipment have been decontaminated
Data Source
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AI summary
A system for decontaminating personal protection equipment (120) includes a microwave oven (500) and a decontamination apparatus configured to be placed in and heated by the microwave oven. The decontamination apparatus includes a containment vessel (100) having an interior space (106) configured to be sealed. The decontamination apparatus also includes one or more stands (118, 902) within the interior space, where the one or more stands are configured to receive and hold one or more pieces of personal protection equipment to be heated by the microwave oven and decontaminated within the interior space. The decontamination apparatus further includes a pressure-relief valve (110) configured to be opened to release a pressure within the interior space.