{"id":17390,"date":"2020-02-16T09:35:42","date_gmt":"2020-02-16T09:35:42","guid":{"rendered":"https:\/\/www.revoscience.com\/en\/?p=17390"},"modified":"2020-06-09T12:11:11","modified_gmt":"2020-06-09T12:11:11","slug":"low-cost-smart-diaper-can-notify-caregiver-when-its-wet","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/low-cost-smart-diaper-can-notify-caregiver-when-its-wet\/","title":{"rendered":"Low-cost \u201csmart\u201d diaper can notify caregiver when it\u2019s wet"},"content":{"rendered":"\n
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For some infants, a wet diaper is cause for an instant, vociferous demand to be changed, while other babies may be unfazed and happy to haul around the damp cargo for lengthy periods without complaint. But if worn too long, a wet diaper can cause painful rashes, and miserable babies \u2014 and parents.<\/p>\n\n\n\n

Now MIT researchers have developed a \u201csmart\u201d diaper embedded with a moisture sensor that can alert a caregiver when a diaper is wet. When the sensor detects dampness in the diaper, it sends a signal to a nearby receiver, which in turn can send a notification to a smartphone or computer.<\/p>\n\n\n\n

The sensor consists of a passive radio frequency identification (RFID) tag, that is placed below a layer of super absorbent polymer, a type of hydrogel that is typically used in diapers to soak up moisture. When the hydrogel is wet, the material expands and becomes slightly conductive \u2014 enough to trigger the RFID tag to send a radio signal to an RFID reader up to 1 meter away.<\/p>\n\n\n\n

The researchers say the design is the first demonstration of hydrogel as a functional antenna element for moisture sensing in diapers using RFID. They estimate that the sensor costs less than 2 cents to manufacture, making it a low-cost, disposable alternative to other smart diaper technology.<\/p>\n\n\n\n

Over time, smart diapers may help record and identify certain health problems, such as signs of constipation or incontinence. The new sensor may be especially useful for nurses working in neonatal units and caring for multiple babies at a time.<\/p>\n\n\n\n

Pankhuri Sen, a research assistant in MIT\u2019s AutoID Laboratory, envisions that the sensor could also be integrated into adult diapers, for patients who might be unaware or too embarrassed to report themselves that a change is needed.<\/p>\n\n\n\n

\u201cDiapers are used not just for babies, but for aging populations, or patients who are bedridden and unable to take care of themselves,\u201d Sen says. \u201cIt would be convenient in these cases for a caregiver to be notified that a patient, particularly in a multibed hospital, needs changing.\u201d<\/p>\n\n\n\n

\u201cThis could prevent rashes and some infections like urinary tract infections, in both aging and infant populations,\u201d adds collaborator Sai Nithin R. Kantareddy, a graduate student in MIT\u2019s Department of Mechanical Engineering.<\/p>\n\n\n\n

Sen, Kantareddy, and their colleagues at MIT, including Rahul Bhattacharryya and Sanjay Sarma, along with Joshua Siegel at Michigan State University, have published their results today in the journal\u00a0IEEE Sensors<\/a><\/em>. Sarma is MIT\u2019s vice president for open learning and the Fred Fort Flowers and Daniel Fort Flowers Professor of Mechanical Engineering.<\/p>\n\n\n\n

Sticker sense<\/strong><\/p>\n\n\n\n

Many off-the-shelf diapers incorporate wetness indicators in the form of strips, printed along the outside of a diaper, that change color when wet \u2014 a design that usually requires removing multiple layers of clothing to be able to see the actual diaper.<\/p>\n\n\n\n

Companies looking into smart diaper technology are considering wetness sensors that are wireless or Bluetooth-enabled, with devices that attach to a diaper\u2019s exterior, along with bulky batteries to power long-range connections to the internet. These sensors are designed to be reusable, requiring a caregiver to remove and clean the sensor before attaching it to each new diaper. Current sensors being explored for smart diapers, Sen estimates, retail for over $40.<\/p>\n\n\n\n

RFID tags in contrast are low-cost and disposable, and can be printed in rolls of individual stickers, similar to barcode tags. MIT\u2019s AutoID Laboratory, founded by Sarma, has been at the forefront of RFID tag development, with the goal of using them to connect our physical world with the internet.<\/p>\n\n\n\n

A typical RFID tag has two elements: an antenna for backscattering radio frequency signals, and an RFID chip that stores the tag\u2019s information, such as the specific product that the tag is affixed to. RFID tags don\u2019t require batteries; they receive energy in the form of radio waves emitted by an RFID reader. When an RFID tag picks up this energy, its antenna activates the RFID chip, which tweaks the radio waves and sends a signal back to the reader, with its information encoded within the waves. This is how, for instance, products labeled with RFID tags can be identified and tracked.<\/p>\n\n\n\n

Sarma\u2019s group has been enabling RFID tags to work not just as wireless trackers, but also\u00a0as sensors<\/a>. Most recently, as part of MIT\u2019s Industrial Liason Program, the team started up a collaboration with Softys, a diaper manufacturer based in South America, to see how RFID tags could be configured as low-cost, disposable wetness detectors in diapers. The researchers visited one of the company\u2019s factories to get a sense of the machinery and assembly involved in diaper manufacturing, then came back to MIT to design a RFID sensor that might reasonably be integrated within the diaper manufacturing process.<\/p>\n\n\n\n

Tag, you\u2019re it<\/strong><\/p>\n\n\n\n

The design they came up with can be incorporated in the bottom layer of a typical diaper. The sensor itself resembles a bow tie, the middle of which consists of a typical RFID chip connecting the bow tie\u2019s two triangles, each made from the hydrogel super absorbent polymer, or SAP.<\/p>\n\n\n\n

Normally, SAP is an insulating material, meaning that it doesn\u2019t conduct current. But when the hydrogel becomes wet, the researchers found that the material properties change and the hydrogel becomes conductive. The conductivity is very weak, but it\u2019s enough to react to any radio signals in the environment, such as those emitted by an RFID reader. This interaction generates a small current that turns on the sensor\u2019s chip, which then acts as a typical RFID tag, tweaking and sending the radio signal back to the reader with information \u2014 in this case, that the diaper is wet.<\/p>\n\n\n\n

The researchers found that by adding a small amount of copper to the sensor, they could boost the sensor\u2019s conductivity and therefore the range at which the tag can communicate to a reader, reaching more than 1 meter away.<\/p>\n\n\n\n

To test the sensor\u2019s performance, they placed a tag within the bottom layers of newborn-sized diapers and wrapped each diaper around a life-sized baby doll, which they filled with saltwater whose conductive properties were similar to human bodily fluids. They placed the dolls at various distances from an RFID reader, at various orientations, such as lying flat versus sitting upright. They found that the particular sensor they designed to fit into newborn-sized diapers was able to activate and communicate to a reader up to 1 meter away when the diaper was fully wet.<\/p>\n\n\n\n

Sen envisions that an RFID reader connected to the internet could be placed in a baby\u2019s room to detect wet diapers, at which point it could send a notification to a caregiver\u2019s phone or computer that a change is needed. For geriatric patients who might also benefit from smart diapers, she says small RFID readers may even be attached to assistive devices, such as canes and wheelchairs to pick up a tag\u2019s signals.<\/p>\n\n\n\n

This research was supported in part by Softys under the MIT Industry Liaison Program.<\/p>\n
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For some infants, a wet diaper is cause for an instant, vociferous demand to be changed, while other babies may be unfazed and happy to haul around the damp cargo for lengthy periods without complaint. <\/p>\n","protected":false},"author":2,"featured_media":17391,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-17390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1-200x200.jpg",200,200,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1-300x200.jpg",300,200,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",600,400,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",600,400,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1-550x360.jpg",550,360,true],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1-95x65.jpg",95,65,true],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",639,426,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",96,64,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2020\/02\/MIT-Diaper-RFID_1.jpg",150,100,false]},"author_info":{"info":["RevoScience"]},"category_info":"Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/17390","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=17390"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/17390\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/17391"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=17390"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=17390"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=17390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}