Non-contact respiratory monitoring system using a ceiling-attached microwave antenna

Uenoyama, Maki; Matsui, Takemi; Yamada, Kouske; Suzuki, Satoshi; Takase, Bonpei; Suzuki, Shinya; Kawakami, Mitsuyuki

doi:10.1007/s11517-006-0091-8

Cited by 84 publications

(45 citation statements)

References 11 publications

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“…We have previously reported a non-contact method that uses a ceiling-attached microwave radar to monitor the respiratory rates of subjects in bed through thick bedding [9] and attached it to the back of a chair to monitor changes of autonomic activation [10]. Microwave radar has the following characteristics: 1) it can detect movement of a remote object without having to make contact; and 2) microwaves can be transmitted through most solid substances except metal or water.…”

Section: Introductionmentioning

confidence: 99%

An approach to a non-contact vital sign monitoring using dual-frequency microwave radars for elderly care

Suzuki¹,

Matsui²,

Kagawa³

et al. 2013

JBiSE

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This study aimed to produce a prototype system for non-contact vital sign monitoring of the elderly using microwave radar with the intention of reducing the burdens on monitored individuals and nursing caregivers. In addition, we tested the ability of the proposed prototype system to measure the respiratory and heart rates of the elderly in a nursing home and discussed the systems effectiveness and problems by examining results of real-time monitoring. The prototype system consisted of two 24-GHz microwave radar antennas and an analysis system. The antennas were positioned below a mattress to monitor motion on the body surface for measuring cardiac and respiratory rates from the dorsal side of the subjects (23.3 ± 1.2 years) who would be lying on the mattress. The heart rates determined by the prototype system correlated significantly with those measured by electrocardiography (r = 0.92). Similarly, the respiratory rates determined by the prototype correlated with those obtained from respiration curves (r = 0.94). Next, we investigated the effectiveness of the prototype system with 7 elderly patients (93.3 ± 10.56 years) at a nursing home. The proposed system appears to be a promising tool for monitoring the vital signs of the elderly in a way that alleviates the need to attach electrodes overnight to confirm patient safety.

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Section: Introductionmentioning

confidence: 99%

An approach to a non-contact vital sign monitoring using dual-frequency microwave radars for elderly care

Suzuki¹,

Matsui²,

Kagawa³

et al. 2013

JBiSE

Self Cite

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“…vital sign monitoring devices, such as electrocardiogram (ECG), pulse oximetry and capnography, because the conventional devices need direct sensors plantation on the subject body as well as they consume comparatively much longer implementation time to start the measurements [1][2][3][4][5][6][7][8]. However, the results accuracy and reliability of RVSM system need to be dealt appropriately for its real-life applications [2].…”

Section: Introductionmentioning

confidence: 99%

“…However, the results accuracy and reliability of RVSM system need to be dealt appropriately for its real-life applications [2]. RVSM finds a vast number of applications in regular and special health care, emergency services, security and defence sectors [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wide Patch Antenna Array Design at 60 GHz Band for Remote Vital Sign Monitoring with Doppler Radar Principle

Rabbani

Ghafouri‐Shiraz

2016

J Infrared Milli Terahz Waves

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In this paper, ultra-wide patch antenna arrays have been presented at 60 GHz band (57.24-65.88 GHz) with improved gain and beam-width capabilities for remote detection of respiration and heart beat rate of a person with Doppler radar principle. The antennas measured and simulation results showed close agreement. The breathing rate (BR) and heart rate (HR) of a 31-year-old man have been accurately detected from various distances ranging from 5 to 200 cm with both single-antenna and dual-antenna operations. In the case of single-antenna operation, the signal is transmitted and received with the same antenna, whereas in dualantenna operation, two identical antennas are employed, one for signal transmission and the other for reception. It has been found that in case of the single-antenna operation, the accuracy of the remote vital sign monitoring (RVSM) is good for short distance; however, in the case of the dual-antenna operations, the RVSM can be accurately carried out at relatively much longer distance. On the other hand, it has also been seen that the visual results are more obvious with higher gain antennas when the radar beam is confined just on the subject's body area.

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“…There have been several attempts to devise contactless methods. Electromagnetic waves can sense chest movement by Doppler effect [7][8][9][10] or by analyzing the signal backscattered by breathing movements [11] and ultrasound waves telemeters permits detection of small body displacements during respiration [12,13]. These solutions give good results but remain indirect because they do not analyze the true air flow and therefore cannot easily detect obstructive sleep apnea (OSA).…”

Section: Introductionmentioning

confidence: 99%

An ultrasonic contactless sensor for breathing monitoring

Arlotto

Grimaldi

Naeck³

et al. 2015

Sleep Medicine

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Abstract:The monitoring of human breathing activity during a long period has multiple fundamental applications in medicine. In breathing sleep disorders such as apnea, the diagnosis is based on events during which the person stops breathing for several periods during sleep. In polysomnography, the standard for sleep disordered breathing analysis, chest movement and airflow are used to monitor the respiratory activity. However, this method has serious drawbacks. Indeed, as the subject should sleep overnight in a laboratory and because of sensors being in direct contact with him, artifacts modifying sleep quality are often observed. This work investigates an analysis of the viability of an ultrasonic device to quantify the breathing activity, without contact and without any perception by the subject. Based on a low power ultrasonic active source and transducer, the device measures the frequency shift produced by the velocity difference between the exhaled air flow and the ambient environment, i.e., the Doppler effect. After acquisition and digitization, a specific signal processing is applied to separate the effects of breath from those due to subject movements from the Doppler signal. The distance between the source and the sensor, about 50 cm, and the use of ultrasound frequency well above audible frequencies, 40 kHz, allow monitoring the breathing activity without any perception by the subject, and therefore without any modification of the sleep quality which is very important for sleep disorders diagnostic applications. This work is patented (patent pending 2013-7-31 number FR.13/57569).

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Non-contact respiratory monitoring system using a ceiling-attached microwave antenna

Cited by 84 publications

References 11 publications

An approach to a non-contact vital sign monitoring using dual-frequency microwave radars for elderly care

An approach to a non-contact vital sign monitoring using dual-frequency microwave radars for elderly care

Ultra-Wide Patch Antenna Array Design at 60 GHz Band for Remote Vital Sign Monitoring with Doppler Radar Principle

An ultrasonic contactless sensor for breathing monitoring

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