Business & Tech

Swallowed capsule could spot trouble, send alert

The capsule could eventually be used in people to find signs of ulcers or disease.
Lillie Paquette/MIT via Associated Press
The capsule could eventually be used in people to find signs of ulcers or disease.

Scientists have developed a swallowed capsule packed with tiny electronics and millions of genetically engineered living cells that might someday be used to spot health problems from inside the gut.

The capsule was tested in pigs and correctly detected signs of bleeding, researchers at the Massachusetts Institute of Technology reported Thursday in the journal Science. At more than an inch long, it will have to be made smaller for testing in people. But the results suggest the capsule could eventually be used in people to find signs of ulcers, inflammatory bowel disease, or even colon cancer, the researchers said.

It’s the latest advance in a growing field of sensors that can be swallowed or worn to monitor our health. Pills equipped with cameras, thermometers, and acidity gauges already look for disease and track digestion. Last year, a psychiatric medication that alerts doctors when it’s taken won US approval. Stick-on skin monitors for recovering stroke patients are in the works.

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The MIT device is the first to use engineered cells as sensors in swallowed capsules, said Kourosh Kalantar-zadeh, who is developing a gas-sensing, all-electronic pill at the Royal Melbourne Institute of Technology in Australia.

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‘‘The work is yet another step toward showing the great promises of smart, ingestible capsules,’’ said Kalantar-zadeh.

The researchers tested the capsules using a harmless strain of E. coli bacteria. The cells were modified with DNA from other bacteria to make them detect blood and then light up. Electronics then take over, relaying signals to a smartphone.

Shrinking the capsule to a normal pill size could be achieved by combining its three electronic chips, said coauthor Phillip Nadeu. Data encryption will be needed to protect patient privacy. And it’s meant to be used once, so they’ll need to make it flushable, coauthor Mark Mimee said.

All that, plus human testing, means a commercial product is years off.

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As labs discover DNA with new sensing powers, the capsule could be customized to diagnose multiple conditions. Coauthor Tim Lu speculated that future patients could swallow a capsule ‘‘once a week or once a month’’ to screen for early signs of cancer instead of getting a colonoscopy.