Ethylene Oxide Scrubbing Sheet for Passive Medical Device Off-Gassing
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Solution Overview
Problem
Existing methods to mitigate ethylene oxide (EtO) off-gassing during transportation and storage of medical devices are inefficient, costly, and pose health risks due to the build-up of EtO concentrations, which are difficult to manage with existing ventilation and scrubber technologies.
Innovation Solution
A passive EtO scrubbing device using a solid strong acid, such as p-toluenesulfonic acid on a flexible, inert support, that irreversibly reacts with EtO to remove it from the air without external power, designed to fit between or around medical device pallets or other sources of fugitive emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional ventilation or scrubber technologies are used to remove EtO during transportation, then EtO concentration can be reduced, but the system becomes complex, heavy, and requires external power sources
Solution Approach 1:
The patent extracts the harmful EtO gas from the transportation environment by placing passive scrubbing sheets directly among the medical device packages. These sheets contain solid acid materials that chemically react with and remove EtO molecules from the air, eliminating the need for complex active ventilation or scrubber systems
Solution Approach 2:
The patent employs disposable scrubbing sheets containing solid acid materials that are inexpensive and can be easily replaced. These sheets are designed for single-use during transportation, eliminating the need for maintenance, power sources, or complex infrastructure while effectively reducing EtO concentrations
2Object-affected harmful factors
If active ventilation systems are installed in shipping containers, then EtO can be removed from the air, but the system requires external power and increases device complexity
Solution Approach 1:
The patent implements self-service chemistry by using solid acid materials that automatically react with EtO gas without requiring external power, control systems, or active ventilation. The chemical reaction occurs spontaneously as EtO off-gasses from the medical devices, making the system completely passive and energy-independent
Solution Approach 2:
The patent removes the need for active power-consuming ventilation systems by extracting the harmful EtO through passive chemical absorption using solid acid materials placed directly in the shipping container among the packages
3Object-affected harmful factors
If longer aeration time is allowed before shipping, then EtO off-gassing is reduced, but supply chain efficiency decreases and shipping delays occur
Solution Approach 1:
The patent applies preliminary action by placing the solid acid scrubbing sheets in the shipping container before the medical devices begin significant off-gassing during transit. This proactive approach captures EtO as it is released, eliminating the need for prolonged pre-shipment aeration periods and enabling faster supply chain turnover
4Reliability
If sealed containers are used for transportation, then protection during transit is improved, but EtO builds up inside creating occupational exposure hazards
Solution Approach 1:
The patent converts the harmful sealed container environment that traps EtO into a beneficial system by introducing solid acid scrubbing sheets that chemically react with and remove EtO. The sealed container that would normally create a hazard instead becomes an effective delivery system when combined with the passive chemical scrubbing technology
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 device effectively and safely removes EtO, meeting requirements of being lightweight, low-cost, and easy to handle, while ensuring no hazardous spills or leaks, thus reducing occupational exposure and environmental emissions.
Implementation Method 1
A passive EtO scrubbing device using a solid strong acid, such as p-toluenesulfonic acid on a flexible, inert support, that irreversibly reacts with EtO to remove it from the air
Data Source
AI summary
An ethylene oxide (EtO) scrubbing sheet for the removing fugitive EtO emissions from, for example, sterilized medical devices and leaks from chemical plants. The scrubbing sheet comprises an acid impregnated layer, a second layer impregnated with an acid neutralizer, combined inside a gas porous protective membrane. The EtO enters the sheet by diffusion and is removed by irreversible chemical reaction.