Influence on Calculated Blood Pressure of Measurement Posture for the Development of Wearable Vital Sign Sensors

We studied a wearable blood pressure sensor using a fiber Bragg grating (FBG) sensor, which is a highly accurate strain sensor. This sensor is installed at the pulsation point of the human body to measure the pulse wave signal. A calibration curve is built that calculates the blood pressure by multivariate analysis using the pulse wave signal and a reference blood pressure measurement. However, if the measurement height of the FBG sensor is different from the reference measurement height, an error is included in the reference blood pressure. We verified the accuracy of the blood pressure calculation with respect to the measurement height difference and the posture of the subject. As the difference between the measurement height of the FBG sensor and the reference blood pressure measurement increased, the accuracy of the blood pressure calculation decreased. When the measurement height was identical and only posture was changed, good accuracy was achieved. In addition, when calibration curves were built using data measured in multiple postures, the blood pressure of each posture could be calculated from a single calibration curve. This will allow miniaturization of the necessary electronics of the sensor system, which is important for a wearable sensor.

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Non-invasive blood pressure measurement by pulse wave analysis using FBG sensor

2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings ◽

10.1109/i2mtc.2015.7151320 ◽

2015 ◽

Cited By ~ 12

Author(s):

Yui Katsuragawa ◽

Hiroaki Ishizawa

Keyword(s):

Blood Pressure ◽

Pressure Measurement ◽

Pulse Wave ◽

Blood Pressure Measurement ◽

Pulse Wave Analysis ◽

Wave Analysis ◽

Invasive Blood Pressure ◽

Non Invasive ◽

Fbg Sensor ◽

Invasive Blood Pressure Measurement

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Measurement of Pulse Wave Signals and Blood Pressure by a Plastic Optical Fiber FBG Sensor

Sensors ◽

10.3390/s19235088 ◽

2019 ◽

Vol 19 (23) ◽

pp. 5088 ◽

Cited By ~ 10

Author(s):

Yuki Haseda ◽

Julien Bonefacino ◽

Hwa-Yaw Tam ◽

Shun Chino ◽

Shouhei Koyama ◽

...

Keyword(s):

Blood Pressure ◽

Optical Fiber ◽

Calibration Curve ◽

Pulse Wave ◽

Blood Pressure Measurement ◽

Plastic Optical Fiber ◽

Fbg Sensor ◽

Wide Range ◽

Silica Optical Fiber ◽

Fbg Sensors

Fiber Bragg grating (FBG) sensors fabricated in silica optical fiber (Silica-FBG) have been used to measure the strain of human arteries as pulse wave signals. A variety of vital signs including blood pressure can be derived from these signals. However, silica optical fiber presents a safety risk because it is easily fractured. In this research, an FBG sensor fabricated in plastic optical fiber (POF-FBG) was employed to resolve this problem. Pulse wave signals were measured by POF-FBG and silica-FBG sensors for four subjects. After signal processing, a calibration curve was constructed by partial least squares regression, then blood pressure was calculated from the calibration curve. As a result, the POF-FBG sensor could measure the pulse wave signals with an signal to noise (SN) ratio at least eight times higher than the silica-FBG sensor. Further, the measured signals were substantially similar to those of an acceleration plethysmograph (APG). Blood pressure is measured with low error, but the POF-FBG APG correlation is distributed from 0.54 to 0.72, which is not as high as desired. Based on these results, pulse wave signals should be measured under a wide range of reference blood pressures to confirm the reliability of blood pressure measurement uses POF-FBG sensors.

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