Abstract
The pulse oximeter is a popular instrument to monitor the arterial oxygen saturation (SPO2). Although a fingertip-type pulse oximeter is the mainstream one on the market at present, it is still inconvenient for long-term monitoring, in particular, with respect to motion. Therefore, the development of a wearable pulse oximeter, such as a finger base-type pulse oximeter, can effectively solve the above issue. However, the tissue structure of the finger base is complex, and there is lack of detailed information on the effect of the light source and detector placement on measuring SPO2. In this study, the practicability of a ring-type pulse oximeter with a multi-detector was investigated by optical human tissue simulation. The optimal design of a ring-type pulse oximeter that can provide the best efficiency of measuring SPO2 was discussed. The efficiency of ring-type pulse oximeters with a single detector and a multi-detector was also discussed. Finally, a wearable and wireless ring-type pulse oximeter was also implemented to validate the simulation results and was compared with the commercial fingertip-type pulse oximeter.
Highlights
The pulse oximeter is a popular instrument for monitoring the arterial oxygen saturation (SPO2)
The light source was placed at 0°, 15°, 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150°, 165° and 180°, respectively, and here, 0° denotes the top of the finger base in this study
When the light source was placed at 150° and the detector was placed at 90°, the AC part of the PPG signal is obviously larger than other detector locations, and the ratio R value was reasonable
Summary
The pulse oximeter is a popular instrument for monitoring the arterial oxygen saturation (SPO2). By using the absorption variation of red light and near-infrared light, corresponding to the variation of the relative oxy-hemoglobin (HbO2) and deoxyhemoglobin (HbR) concentration in artery blood, the estimation of SPO2 can be calibrated by the pulse oximeter. The most popular pulse oximeter is the fingertip-type pulse oximeter [1,2]. The fingertip-type pulse oximeter is inconvenient for long-term monitoring, in particular, with respect to motion. The development of wearable pulse oximeter, such as a finger-base-type pulse oximeter, can effectively improve the above issue. Several studies have attempted to develop a finger-base-type pulse oximeter.
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