Researchers Make Plasma Steriliser Using a £40 Microwave Oven

February 23, 2010 – 9:00 am

From the Wire: Researchers at Glyndwr University have developed technology for producing a portable device for sterilising medical equipment using a £40 microwave oven. The everyday kitchen device has been used to deliver a low cost, chemical-free solution to killing harmful bacteria on medical tools used in surgeries. The research has been led by Dr Andy Wright, Senior Research Scientist at Glyndwr University.

Traditionally, steam at high temperatures has been used to sterilise medical instruments before being used on patients. However, with bacteria becoming more resistant to such treatments, aggressive chemicals have increasingly been used in recent years. Now, researchers at the University’s Advanced Materials Unit have discovered that by attaching a vacuum vessel to a microwave oven, plasma discharges can be generated in the form of atomic oxygen and ozone – both aggressive gases effective in killing bacteria. The system relies on the intense electric fields generated inside a microwave running at low power.

According to Dr Wright, tests have shown the technology to be as effective as existing steam-based methods of sterilisation, if not more – but at a fraction of the cost. The device is capable of sterilising equipment in five minutes or less with air.

“The oven we chose is the simplest type commercially available and with the modifications we made the cost of the system comes to under £2000,” Dr Wright says. “The most reliable sterilisation systems currently cost around £70,000, making this very cost-effective. The technology now exists for hospitals, surgeries and dentists to move away from steam-based sterilisation methods and take up a plasma-based approach that has been shown to be 100% effective against the most difficult pathogens,” he adds. “Items such as small surgical instruments can be quickly sterilised prior to use. However, one of the main advantages is its small size and low weight. Instruments do not have to be sent away for treatment and the cost of using disposable items can be reduced.”

More information on the research is available from Glyndwr University.

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  1. One Response to “Researchers Make Plasma Steriliser Using a £40 Microwave Oven”

  2. Hello Dr. Wright,

    Further to the article on the low cost steriliser, I have a number of contacts within the European sterilisation sector that could help you to bring the product to market and to help with the technicalities associated with validating it. My tel number is 07956 532963.

    In the past I was the UK international S&M Manager for Isotron PLC, Europe’s largest contract sterilisation company

    By Rob Hook on Jan 4, 2011

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