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Optical sensors watch over patients in hospitals

Devices record heart and respiration rates and detect whether a person is in the bed

31.08.2022 - Sensors will be embedded in hospital mattresses.

Tiny smart bed sensors embedded in hospital mattresses could put an end to painful and potentially life-threatening pressure sores, thanks to new technology developed by the University of South Australia. The scientists have designed minute optical fiber sensors, which can be attached to the upper surface of a mattress to monitor movement and record heart and respira­tory rates. The unobtrusive sensors can detect when a hospital patient turns over, leaves a bed, or just remains motionless, picking up their breathing.

Nurses can therefore be remotely alerted if a patient has not moved within a couple of hours, prompting them to adjust the patient’s position. Lead UniSA researcher Stephen Warren-Smith says the technology could “signi­ficantly relieve” the burden on hospital staff having to constantly monitor patients for pressure sores. “Each year, millions of older people in hospitals and nursing homes experience pressure injuries, or ulcers, which take a long time to heal and can be fatal,” Warren-Smith says. “At the very least these injuries can cause severe pain, disrupt sleep, affect their mood as well as their rehabilitation, mobility and quality of life.” 

Unlike the sensors that many people wear on their wrists to monitor physical activity and physio­logical signs, the optical fiber sensors are embedded in the same space as a person, but not on them physically. Hospitals currently use weight-based sensors or cameras installed in the room to monitor patients, but both have limitations, Warren-Smith says. “Existing weight-based hospital sensors cannot predict when a patient leaves the bed until their feet touch the floor, leaving little time for nursing staff to respond in the event of a fall. Also, there are privacy issues with camera-based techno­logy.”

The optical fiber sensors are sensitive enough to record heart and respiration rates and can detect whether a person is in the bed, even if they remain stationary for long periods. “Respira­tion rates are often the first sign that a patient is deteriora­ting. This normally requires devices to be attached to the patient, either on the chest, as a mask on the face, or ventilator. These can be restrictive and sometimes inappropriate in an aged care setting. “Moni­toring vital signs conti­nuously, unobtrusively and cheaply via the mattress-embedded sensors is a far better solution for both patient and nurse,” Warren-Smith says. (Source: UniSA)

Reference: S. C. Warren-Smith et al.: Multimode optical fiber specklegram smart bed sensor array, J. Biomed. Opt. 27, 067002 (2022); DOI: 10.1117/1.JBO.27.6.067002

Link: Future Industries Institute, University of South Australia, Adelaide, Australia

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