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Research Papers

Unconstrained Measurement of Respiration Motions of Chest and Abdomen Using a Tactile Sensor Sheet in Supine Position on Bed

[+] Author and Article Information
Shijie Guo

School of Mechanical Engineering,
Hebei University of Technology,
8, Dingzigu Yihaolu, Hongqiao-qu,
Tianjin 300132, China
e-mail: guoshijie@hebut.edu.cn

Kazuya Matsuo

School of Engineering,
Kyushu Institute of Technology,
1-1, Sensui-cho, Tobata-ku,
Kitakyushu-shi, Fukuoka-ken 804-8550, Japan
e-mail: matsuo@cntl.kyutech.ac.jp

Jinyue Liu

School of Mechanical Engineering,
Hebei University of Technology,
8, Dingzigu Yihaolu, Hongqiao-qu,
Tianjin 300132, China
e-mail: ljy@hebut.edu.cn

Toshiharu Mukai

Faculty of Science and Technology,
Meijo University,
1-501 Shiogamaguchi, Tempaku-ku,
Nagoya 468-8502, Japan
e-mail: mukai@meijo-u.ac.jp

Manuscript received February 2, 2016; final manuscript received July 30, 2016; published online September 12, 2016. Assoc. Editor: Michael Eggen.

J. Med. Devices 10(4), 041008 (Sep 12, 2016) (7 pages) Paper No: MED-16-1017; doi: 10.1115/1.4034465 History: Received February 02, 2016; Revised July 30, 2016

The management of health through daily monitoring of respiration is of major importance for early diagnosis to prevent respiratory and circulatory diseases. Such daily health monitoring is possible only if the monitoring system is physically and psychologically noninvasive. However, current unconstrained measurement methods cannot distinguish chest and abdominal movements in diagnosing sleep apnea. In this study, a flexible and stretchable tactile sensor sheet was developed to measure the static body pressure of a subject who lies on it and measure the pressure fluctuations induced by respiration or respiratory efforts. The results were compared with the measurements by band sensors that are widely used for measuring chest and abdominal movements in clinic. It was demonstrated that the sensor sheet can distinguish chest and abdominal movements in a supine position. The reasons why the pressure fluctuations measured by the sensor sheet are antiphase with the outputs of band sensors are discussed using a simple dynamic model.

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Figures

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Fig. 1

Concept view of measuring chest and abdominal movements with band sensors

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Fig. 2

Schematic structure of the sensor sheet

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Fig. 3

Equivalent circuit of a sensor cell

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Fig. 4

The approach for detecting resistance and capacitance of a sensor cell

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Fig. 5

Relationship between pressure and capacitance

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Fig. 6

Static pressure distributions when a subject lies on the sensor sheet in supine and lateral positions

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Fig. 7

Setup of sensors and the measured static pressure distribution: (a) setup of the tactile sensor sheet and band sensors and (b) static pressure distribution measured by the tactile sensor sheet

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Fig. 8

Comparison between the outputs of band sensors and the pressure fluctuations measured by the tactile sensor sheet: (a) output of the band sensor and the pressure fluctuation at chest and (b) output of the band sensor and the pressure fluctuation at abdomen

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Fig. 9

Average pressure fluctuation at LINE M

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Fig. 10

Conceptual diagram of the muscles and bones involved in respiration and the movements of rib cage and abdomen when a subject lying in a supine position inhales air

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Fig. 11

Dynamic model of expansion of chest or abdomen and the reaction force from mattress during inspiration

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Fig. 12

Pressure fluctuations at chest and abdomen and output of chest band sensor in deep and slow respiration: (a) pressure fluctuation and output of band sensor at chest and (b) pressure fluctuation at abdomen

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