著者

本井 幸介 中村 心也 田中 直登 山越 憲一

出版者

Japanese Society for Medical and Biological Engineering = 日本生体医工学会

雑誌

生体医工学 = Transactions of Japanese Society for Medical and Biological Engineering : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.51, no.4, pp.268-275, 2013-08

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Recently, the freak accidents in home have been increased and they are caused by the asphyxiation, drowning, falling, fire, and toxicosis. Especially in bathroom, the accident frequently arise and thus the healthcare monitoring and the accident detection system can be useful for attainment of safe and untroubled daily life. While some monitoring systems for moving state using infrared ray and ultrasonic wave were already developed, these methods distinguish only whether or not a bather is moving. Also, detailed motion analysis using CCD camera has the problem of privacy for the practical use. From these viewpoints, we designed the monitoring system for the electrocardiogram and respiration signal using bathtub-installed electrodes, showing its usefulness for the healthcare and the drowning alarm during taking a bath. However, the range over which this method is possible is limited in the bathtub and thus the detection in washing place are impossible. To solve this drawback, we developed a new system capable of detecting the accident in the washing place together with the pulse and respiration rate using a bath mat type multipoint pressure sensor located in washing place of bathroom. From the results of the accuracy evaluation in 20 healthy subjects, it is demonstrated that the present system can accurately detect the accident [60/60, 100%] and show the good correlation between the pulse [r=0.99] and respiration [r=0.95] obtained from the system and those obtained from the conventional methods using the sensors attached to the body surface.

著者

田中 志信 本井 幸介 野川 雅道 山越 健弘 山越 憲一

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.44, no.3, pp.467-474, 2006 (Released:2008-05-01)

参考文献数

18

被引用文献数

1

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The daily monitoring of health conditions at home is a very important subject not only as an effective scheme for the early diagnosis and treatment of cardiovascular and other diseases, but also for the prevention and control of such diseases. From this point of view, we have been developing a fully automated “non-conscious” monitoring system for home healthcare. In this paper, we describe the structural details of a newly developed blood pressure (BP) measurement system built into a toilet seat and some results obtained using the system. The principle used for BP measurement was the volume-oscillometric method. A reflectance-type photoplethysmographic sensor was installed in an appropriate position on the toilet seat, and it was automatically lifted and lowered using a newly designed helicoid-type actuator. Systolic (SBP) and mean BP (MBP) were obtained using the arterial volume pulsation signal obtained by the sensor. In order to evaluate the accuracy of the BP measurements, simultaneous measurements were carried out using two types of commercially available BP monitors (upper arm and wrist). Simultaneous measurement using an “invasive technique” via catheterization to the right brachial artery was also conducted. From the results obtained (bias[s.d.] for SBP; Upper arm: -1.20 [7.90] mmHg, Wrist: 0.44 [7.28] mmHg, Invasive: -0.41 [4.91] mmHg, bias [s.d.] for MBP; Upper arm: 4.40 [6.91] mmHg, Wrist: 5.07 [8.04] mmHg, Invasive: 3.68 [5.69] mmHg), reasonable accuracy of the present system was clearly demonstrated. This system, which requires no cumbersome procedures for BP measurement such as cuff setting, proper positioning of measuring site and so on, appears to be a useful means for long-term home healthcare monitoring.

著者

本井 幸介 中村 心也 田中 直登 山越 憲一

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.51, no.4, pp.268-275, 2013-08-10 (Released:2013-12-11)

参考文献数

25

---

Recently, the freak accidents in home have been increased and they are caused by the asphyxiation, drowning, falling, fire, and toxicosis. Especially in bathroom, the accident frequently arise and thus the healthcare monitoring and the accident detection system can be useful for attainment of safe and untroubled daily life. While some monitoring systems for moving state using infrared ray and ultrasonic wave were already developed, these methods distinguish only whether or not a bather is moving. Also, detailed motion analysis using CCD camera has the problem of privacy for the practical use. From these viewpoints, we designed the monitoring system for the electrocardiogram and respiration signal using bathtub-installed electrodes, showing its usefulness for the healthcare and the drowning alarm during taking a bath. However, the range over which this method is possible is limited in the bathtub and thus the detection in washing place are impossible. To solve this drawback, we developed a new system capable of detecting the accident in the washing place together with the pulse and respiration rate using a bath mat type multipoint pressure sensor located in washing place of bathroom. From the results of the accuracy evaluation in 20 healthy subjects, it is demonstrated that the present system can accurately detect the accident [60/60, 100%]and show the good correlation between the pulse [r=0.99] and respiration [r=0.95]obtained from the system and those obtained from the conventional methods using the sensors attached to the body surface.

著者

田中 志信 本井 幸介 野川 雅道 山越 健弘 山越 憲一

出版者

日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 = Transactions of the Japanese Society for Medical and Biological Engineering : BME (ISSN:1347443X)

巻号頁・発行日

vol.44, no.3, pp.467-474, 2006-09-10

被引用文献数

3

---

The daily monitoring of health conditions at home is a very important subject not only as an effective scheme for the early diagnosis and treatment of cardiovascular and other diseases, but also for the prevention and control of such diseases. From this point of view, we have been developing a fully automated "non-conscious" monitoring system for home healthcare. In this paper, we describe the structural details of a newly developed blood pressure (BP) measurement system built into a toilet seat and some results obtained using the system. The principle used for BP measurement was the volume-oscillometric method. A reflectance-type photop-lethysmographic sensor was installed in an appropriate position on the toilet seat, and it was automatically lifted and lowered using a newly designed helicoid-type actuator. Systolic (SBP) and mean BP (MBP) were obtained using the arterial volume pulsation signal obtained by the sensor. In order to evaluate the accuracy of the BP measurements, simultaneous measurements were carried out using two types of commercially available BP monitors (upper arm and wrist). Simultaneous measurement using an "invasive technique" via catheterization to the right brachial artery was also conducted. From the results obtained (bias [s.d.] for SBP; Upper arm: -1.20 [7.90] mmHg, Wrist: 0.44 [7.28] mmHg, Invasive: -0.41 [4.91] mmHg, bias [s.d.] for MBP; Upper arm: 4.40 [6.91] mmHg, Wrist: 5.07 [8.04] mmHg, Invasive: 3.68 [5.69] mmHg), reasonable accuracy of the present system was clearly demonstrated. This system, which requires no cumbersome procedures for BP measurement such as cuff setting, proper positioning of measuring site and so on, appears to be a useful means for long-term home healthcare monitoring.