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Medtress - Smart medical bed for contact-free continuous patient monitoring using a novel radar and capacitive ECG sensor system

NOV
10
2020
10. NOV 2020

Lecture electronica Conferences > electronica Medical Electronics Conference > Session 3: MOBILE HEALTH MONITORING

11:00-11:30 h | Virtual

Unrecognized patient deterioration can lead to prolonged hospitalization, disability or mortality. Approximately 10% of hospital admissions are associated with such an adverse event. [1] Heart rate (HR), heart rate variability (HRV), electrocardiogram (ECG), pulse transit time (PTT) and respiratory rate (RR) are important predictors for adverse events and can indicate warning signs 6 to 8 hours prior to the event. [2] Therefore, we propose a contact-free continuous patient monitoring system using a 24 GHz radar and capacitive ECG sensor to identify signs of patient deterioration, initiate early interventions and help to promote patient safety. The Medtress system can be unobtrusively integrated into the mattress and is able to record vital signs through bedsheets and clothing. The 24 GHz continuous wave radar sensor measures respiration, heartbeat and motion signals of the patient by evaluating the phase-shift of the reflection wave through arctangent demodulation. Signal processing is used to separate the respiration signal from the heartbeat signal with a digital low-pass filter. The capacitive ECG utilizes conductive silver-coated fabric as electrodes which are soft, washable and maximize patient comfort. For the ECG signal amplification, a high impedance inverting amplifier structure with an integrated high-pass filter is implemented. To minimize the impact of noise interferences, which can completely superimpose the desired ECG signal, an analog signal filtering is applied. This contact-free continuous monitoring system offers a novel solution to provide 24/7 patient vigilance for HR, HRV, ECG, PTT and RR. We expect that the proposed Medtress system can effectively support caregivers in patient health management and that contact-free continuous patient monitoring will become a key feature of smart medical beds in the future. [1] Rafter N, Hickey A, Condell S, et al. Adverse events in healthcare: learning from mistakes. QJM. 2015;108(4):273-277. doi:10.1093/qjmed/hcu145 [2] Al-Qahtani S, Al-Dorzi HM. Rapid response systems in acute hospital care. Ann Thorac Med. 2010;5(1):1-4. doi:10.4103/1817-1737.58952

Subjects: Medical Electronics

Speaker: Stefan Pehr (TU München)

Type: Lecture

Speech: English

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Unrecognized patient deterioration can lead to prolonged hospitalization, disability or mortality. Approximately 10% of hospital admissions are associated with such an adverse event. [1] Heart rate (HR), heart rate variability (HRV), electrocardiogram (ECG), pulse transit time (PTT) and respiratory rate (RR) are important predictors for adverse events and can indicate warning signs 6 to 8 hours prior to the event. [2] Therefore, we propose a contact-free continuous patient monitoring system using a 24 GHz radar and capacitive ECG sensor to identify signs of patient deterioration, initiate early interventions and help to promote patient safety. The Medtress system can be unobtrusively integrated into the mattress and is able to record vital signs through bedsheets and clothing. The 24 GHz continuous wave radar sensor measures respiration, heartbeat and motion signals of the patient by evaluating the phase-shift of the reflection wave through arctangent demodulation. Signal processing is used to separate the respiration signal from the heartbeat signal with a digital low-pass filter. The capacitive ECG utilizes conductive silver-coated fabric as electrodes which are soft, washable and maximize patient comfort. For the ECG signal amplification, a high impedance inverting amplifier structure with an integrated high-pass filter is implemented. To minimize the impact of noise interferences, which can completely superimpose the desired ECG signal, an analog signal filtering is applied. This contact-free continuous monitoring system offers a novel solution to provide 24/7 patient vigilance for HR, HRV, ECG, PTT and RR. We expect that the proposed Medtress system can effectively support caregivers in patient health management and that contact-free continuous patient monitoring will become a key feature of smart medical beds in the future. [1] Rafter N, Hickey A, Condell S, et al. Adverse events in healthcare: learning from mistakes. QJM. 2015;108(4):273-277. doi:10.1093/qjmed/hcu145 [2] Al-Qahtani S, Al-Dorzi HM. Rapid response systems in acute hospital care. Ann Thorac Med. 2010;5(1):1-4. doi:10.4103/1817-1737.58952

Speaker,
TU München

Stefan Pehr

Stefan Pehr

TU München

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Speaker,
TU München

Stefan Pehr
Stefan Pehr

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