Skip to Content

Solar Disinfecting Device for the Developing World

A team at Rice says it can sterilize medical instruments using the sun. The technology could help bring safe surgical procedures to parts of the developing world that lack them.
May 18, 2011

The ever-industrious engineering students at Rice have made another promising device with medical applications. They’ve modified a solar power apparatus, tweaking it so that it can reach temperatures sufficient to sterilize surgical instruments. The technology could potentially bring effective sterilizing techniques to parts of the developing world that have traditionally lacked them.

The Rice students’ sun-powered autoclave is a modification, essentially, on a much older device, the Capteur Soleil, invented by the Frenchman Jean Boubour. The Capteur Soleil looks something like a metallic swingset, with curved panels to capture solar power. The Rice students then added a specially insulated box containing the autoclave.

Here’s how the system works. The sunlight’s energy is channeled and used to generate steam. A less inventive design might have simply sent that steam right into the autoclave to sterilize instruments. Instead, the team decided to use the steam to heat a conductive hotplate. The circular hotplate was designed in such a manner as to equally distribute the hot steam as it enters. A YouTube video explaining the project shows the hotplate (it’s around the 0:50 mark), which looks something like crop circles, or a circular labyrinth. As the steam gets ferried through the loops in the labyrinth, it gives “a nice, even heat transfer to the bottom of the autoclave,” says William Dunk, one of the students behind the project, in the video.

The hot plate essentially renders the whole apparatus a stovetop. The autoclave, which a press release describes wonderfully colloquially as “like a tricked-out pressure cooker,” is in a plywood frame and features silicon-based Thermablok insulation, which is derived from no less than NASA research on how to insulate the space shuttle.

Maintaining an autoclave at 121 degrees Celsius for a half-hour is the benchmark set by the Centers for Disease Control and Prevention for an environment that renders instruments sterile, “and we’ve found we’re able to do that pretty easily,” one of the students, Sam Major, recently said. They ran a test using some biological spores from a test kit. After running them through the autoclave, all the spores were dead.

The Rice team isn’t the only group interested in using solar power to sterilize instruments. The World Health Organization has posted information (PDF) on a research group called Solarclave that developed a similar apparatus in partnership with universities and NGOs. As for the Rice team’s device, it’s really “the latest iteration of a much larger project,” in the words of the team’s faculty adviser, Doug Schuler.

Keep Reading

Most Popular

This startup wants to copy you into an embryo for organ harvesting

With plans to create realistic synthetic embryos, grown in jars, Renewal Bio is on a journey to the horizon of science and ethics.

VR is as good as psychedelics at helping people reach transcendence

On key metrics, a VR experience elicited a response indistinguishable from subjects who took medium doses of LSD or magic mushrooms.

This nanoparticle could be the key to a universal covid vaccine

Ending the covid pandemic might well require a vaccine that protects against any new strains. Researchers may have found a strategy that will work.

Stay connected

Illustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at customer-service@technologyreview.com with a list of newsletters you’d like to receive.