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. 2018 Feb 23;9(2):90.
doi: 10.3390/mi9020090.

Wearable Pulse Wave Monitoring System Based on MEMS Sensors

Yu Sun  1 , Ying Dong  2 , Ruyi Gao  3 , Yao Chu  4 , Min Zhang  5 , Xiang Qian  6 , Xiaohao Wang  7   8
Affiliations

Wearable Pulse Wave Monitoring System Based on MEMS Sensors

Yu Sun et al. Micromachines (Basel). .

Abstract

Pulse wave monitoring is critical for the evaluation of human health. In this paper, a wearable multi-sensor pulse wave monitoring system is proposed and demonstrated. The monitoring system consists of a measuring unit and an analog circuit processing unit. The main part of the measuring unit is a flexible printed circuit board (PCB) with a thickness of 0.15 mm, which includes three micro-electromechanical system (MEMS) pressure sensors softly packaged by polydimethylsiloxane (PDMS), a blood oxygen detector and a MEMS three-axis accelerometer. The MEMS pressure sensors，the blood oxygen detector and the accelerometer are fixed on the expected locations of the flexible PCB. The analog circuit processing unit includes a power supply module, a filter and an amplifier. The pulse waves of two volunteers are detected by the monitoring system in this study. The output signals of the analog circuit processing module are processed and analyzed. In the preliminary test, the time delay of the three pressure pulse waves has been detected and the calculated pulse wave velocities (PWVs) are 12.50 and 11.36 m/s, respectively. The K value, related to the area of the pulse wave, can be obtained. Both the PWV and K value meet the health parameter standards.

Keywords: MEMS sensor; pulse wave; signal processing; wearable device.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The panorama of the system.
Figure 2
Figure 2
Waveform and characteristic points of the pulse wave.
Figure 3
Figure 3
Measurement of the pulse wave delay time.
Figure 4
Figure 4
The block diagram of the monitoring system.
Figure 5
Figure 5
The blood oxygen detector and the packaged MEMS pressure sensor.
Figure 6
Figure 6
Mold for packaging MEMS pressure sensors.
Figure 7
Figure 7
The flexible PCB.
Figure 8
Figure 8
Physical picture of the hardware circuit.
Figure 9
Figure 9
The wearable pulse wave monitoring system.
Figure 10
Figure 10
Waveforms of a multi-sensor pulse wave monitoring system.
Figure 11
Figure 11
The processed pulse waves.
Figure 12
Figure 12
The chart of K values.
See this image and copyright information in PMC

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