Design and Application of a Flexible Blood Oxygen Sensing Array for Wearable Devices

The performance of portable or wearable oximeters is affected by improper movement or wear, which causes an error in the blood oxygen concentration calculation. The error comes from external incident stray light or light leakage caused by the improper fit of the sensor to the skin. This study aimed...

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Bibliographic Details
Published in:Micromachines (Basel) 2022-10, Vol.13 (10), p.1742
Main Authors: Kuo, Wen-Cheng, Wu, Tzu-Chien, Wang, Jun-Sheng
Format: Article
Language:English
Subjects:
Blood
blood oxygen
Heart
Hemoglobin
Light emitting diodes
Light transmission
Luminous intensity
Microelectromechanical systems
Oximetry
Oxygen
Oxygen saturation
parylene
Physiology
Portable equipment
Pulse modulation
Pulse oximetry
sensing array
Sensor arrays
Sensors
Skin
Substrates
Veins & arteries
Wearable computers
wearable device
Wearable technology
Wrist
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Description
Summary:The performance of portable or wearable oximeters is affected by improper movement or wear, which causes an error in the blood oxygen concentration calculation. The error comes from external incident stray light or light leakage caused by the improper fit of the sensor to the skin. This study aimed to develop a flexible blood oxygen sensing system with a 3 × 3 array that uses a reflective-type blood oxygen sensing chip to sequentially measure the blood oxygen levels at nine locations through a time division pulse modulation method. Each sensing chip has light transmission and receiving parts. A flip chip package was used to integrate the sensing chip, and a flexible parylene substrate that could fit the curvature of the wrist and locate the array of photo diodes around the radial artery of the wrist was used. By scanning the sensor array in dynamic behavior, the correct light intensity can be extracted to obtain the blood oxygen concentration and prevent errors due to improper fit or sensor movement during exercise.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi13101742