HOSPITAL workers often have to wash their hands dozens of times a day — and may need a minute or more to do the process right, by scrubbing with soap and water. But new devices could reduce the task to just four seconds, cleaning even hard-to-reach areas under fingernails.
Instead of scrubbing, the workers would put their hands into a small box that bathes them with plasma — the same sort of luminous gas found in neon signs, fluorescent tubes and TV displays. This plasma, though, is at room temperature and pressure, and is engineered to zap germs, including the drug-resistant supergerm MRSA.
The technology is being developed in several laboratories. Gregor Morfill, who created several prototypes using the technology at the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, says the plasma quickly inactivates not only bacteria but also viruses and fungi.
Dr. Morfill and his colleagues have tested their devices on hands and feet. “It works on athlete’s foot,” he said. “And the nice thing is, you don’t have to take your socks off. They are disinfected, too.” (The cleaning takes a bit longer when socks are added to the job, he said — about 25 seconds. “And it doesn’t yet work through shoes,” he added.)
Plasmas engineered to zap microorganisms aren’t new. During the last decade, they have come into use to sterilize some medical instruments. But using them on human tissue is another matter, said Mark Kushner, director of the Michigan Institute for Plasma Science and Engineering and a professor at the University of Michigan in Ann Arbor. “Many thousands of volts drive the generation of plasma,” he said, “and normally one doesn’t want to touch thousands of volts.” But the design of the new hand sanitizers, he said, protects people from doing so. Reassured by that design, about five years ago he put his naked thumb into a jet of microbe-destroying plasma at the lab of another plasma researcher.
“It was just one of those leaps of faith,” he said. (His thumb survived just fine.)
Research in the field of plasma medicine has grown quickly in the last decade, with at least 50 groups worldwide working on medical uses, Professor Kushner estimated.
He said that there were many documented cases of plasmas being applied for sanitizing skin or other body parts, and “for speeding the rate of blood clotting in wound healing.”
“Plasmas turn out to have beneficial effects,” he said.
Dr. Morfill, who has a plasma research laboratory inside the international space station, took an unusual route to studying medical uses of plasmas. He was researching the natural plasmas of space, including the charged dust in Saturn’s rings, and decided to develop plasmas for health on earth.
He has developed several prototypes of hand-cleaning devices that can be mounted on walls, as well as a portable, battery-operated model the size of a large electric toothbrush. Companies are interested in manufacturing the devices, he said, which may one day be particularly useful in developing countries where medical services can be scarce.
The devices can probably be built for $100 or less, as no expensive parts are used, he said.
The plasma cleaners make their antibacterial cocktails by running electrical current through air, said David B. Graves, a professor of chemical engineering at the University of California, Berkeley, who has worked on low-temperature plasma applications for 25 years.
Professor Graves is doing computer simulations of the chemical reactions that occur in the Morfill plasmas. The electric current ionizes the oxygen, nitrogen and water vapor in the air, he said, eventually creating the nitric oxide, hydrogen peroxide and particles that are so effective against bacteria, viruses and fungi.
Many other cleaning applications of plasma are being researched. In addition to hand sanitizers, Michael G. Kong, a professor of bioelectrics engineering at Loughborough University in Leicestershire, England, has developed a prototype for plasma jets that can be built into air-conditioning systems. As air is transmitted through the system from one hospital room to another, for example, the jets inactivate microorganisms, fungi and viruses in the air.
IN the Netherlands, Gerrit M. W. Kroesen, a professor of plasma physics at the Eindhoven University of Technology, is focusing on the treatment of burn wounds. “We have seen that plasmas help with disinfection,” he said. “They also stimulate regeneration of tissue.”
The first products to reach hospitals, after surface cleaners and instrument disinfectants, will probably be hand sanitizers, said Alexander Fridman, a professor and director of the Drexel Plasma Institute at Drexel University in Philadelphia.
“Hand sanitizers are the low-hanging fruit here,” he said, as their safety can be demonstrated relatively easily.
But other potential applications, including treatment of burns or cancers, are further away. “We are able to do miracles with this technology,” he said, “but we have to make sure the treatments are not toxic.”
E-mail: novelties@nytimes.com.
More Articles in Business » A version of this article appeared in print on February 14, 2010, on page BU5 of the New York edition.
Researchers at various universities are developing technology to better clean and disinfect hands. As US Hospital continue to up the ante in preventing spread of infection, that have focused on washing hands as a primary culprit. Germs and disease easily pass from patient, to hospital worker, to the next patient with all the poking and prodding required. But is more technology really needed, or it is overkill?
Reviewing the situations, the problem does not occur in surgery. Doctors and nurses take sterility incredibly seriously and wash hands to the hilt when going in and out of sterile rooms. Once again, it is not the acute, dramatic area of the hospital where problems occur. It is in the routine, day to day care of patients in their beds. Healthcare workers go from bed to bed, room to room, giving patients pills, examining, touching, responding to quick alerts. This is where the problem occurs.
As Atul Gawande says (paraphrasing): "There is no better technique for washing hands or length of time needed in washing hands. Its very simple: wash your hands 100% of the time when you are supposed to; not 80%, not 90%. But 100% of the time. Then this problem quickly dissappears."
At Mobile Aspects, though for different healthcare issues, we develop technologies that ensure the routine happens, not 80% of the time, not 90% of the time, but 100% of the time. And if the routine does not occur, we provide an alert instantaneously to make people aware of the situation. Steps are minimized, saving people time, and each step is electronically documented and shared with other systems that need the information.
My questions here is: If people are not washing their hands with a simple solution of soap and water, will they put their hands into this machine to sterilize them? Unless it automatically sterilizes your whole body as you walk into and out of a room (ooh! bright idea bulb), I think this will be an expensive fix that doesnt work.
As often in healthcare, we have the technology to save millions and millions of lives in very acute conditions. This is not where problems occur. It is not the people either. It is the system - in this case, we must train people to wash their hands each and every time they enter and leave a room, absolutely, 100% of the time. This will solve 80% of the problem with very litter effort (80/20 rule). Then, expensive technology such as detailed above can be used in situation where it still does not solve the problem.
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