Oral and forehead thermometers may not accurately capture a person\u2019s core body temperature, and the few ingestible temperature sensors on the market are so big they are hard to swallow and risk obstructing the GI tract. But MIT engineers created one that can send continuous temperature updates at a size of just six by four millimeters.<\/p>\n
To create it, the researchers built a circuit that can fit on a one-square-\u00admillimeter silicon chip and designed an oscillator based on leakage current\u2014the small current that flows through a circuit when it\u2019s off. Its frequency varies depending on the temperature of the chip\u2019s surroundings.<\/p>\n
The circuit detects temperature within 0.01 \u00b0C and can be powered with a 1.55-volt coin cell battery. A strategy known as backscattering further cuts energy consumption, allowing most of the power requirements to be outsourced to an antenna outside the body. It emits an ultra-high-frequency radio wave, which is modulated by an antenna within the sensor and sent back to the external one. By interpreting the changes in the radio wave, the external antenna can calculate the temperature value.<\/p>\n
The result is \u201cthe smallest ingestible capsule that we have seen for temperature-\u00adsensing paradigms,\u201d says Saransh Sharma, a former MIT postdoc now at the University of Cambridge, who is lead author of a paper on the work. <\/p>\n
The researchers envision using it to monitor infection, observe patients during and after anesthesia, track fevers in children, help mark ovulation, and more. It could also be used to monitor athletes, soldiers, or anyone else exposed to extreme temperatures. <\/p>\n
\u201cA sensor like this gives us the ability to monitor infections and identify them early,\u201d says Giovanni Traverso, an associate professor of mechanical engineering and one of the paper\u2019s senior authors, along with MIT provost Anantha Chandrakasan. \u201cThat\u2019s very relevant, particularly for at-risk populations like people who are immunosuppressed.\u201d Ultimately, he hopes, it could replace other types of thermometers for everyone.<\/p>\n","protected":false},"excerpt":{"rendered":"
Oral and forehead thermometers may not accurately capture a person\u2019s core body temperature, and the few ingestible temperature sensors on the market are so big they are hard to swallow and risk obstructing the GI tract. But MIT engineers created one that can send continuous temperature updates at a size […]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[67],"class_list":["post-8104","post","type-post","status-publish","format-standard","hentry","category-mit-feed","tag-mit-tech"],"_links":{"self":[{"href":"https:\/\/hoo.central12.com\/portal\/wp-json\/wp\/v2\/posts\/8104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hoo.central12.com\/portal\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hoo.central12.com\/portal\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/hoo.central12.com\/portal\/wp-json\/wp\/v2\/comments?post=8104"}],"version-history":[{"count":0,"href":"https:\/\/hoo.central12.com\/portal\/wp-json\/wp\/v2\/posts\/8104\/revisions"}],"wp:attachment":[{"href":"https:\/\/hoo.central12.com\/portal\/wp-json\/wp\/v2\/media?parent=8104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hoo.central12.com\/portal\/wp-json\/wp\/v2\/categories?post=8104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hoo.central12.com\/portal\/wp-json\/wp\/v2\/tags?post=8104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}