使用多光學感測器之無線戒指型脈搏血氧儀設計

Abstract

脈搏血氧儀是一個用於量測血氧濃度的儀器。目前，指尖式脈搏血氧儀是市場上的主流類型。但是，指尖式脈搏血氧儀受限於穿戴位置而不便於長期監測，尤其是受測者在運動的情況下愈明顯。因此，發展戒指型脈搏血氧儀可以有效地解決此問題。然而，在發展戒指型脈搏血氧儀的過程中，手指的複雜組織結構對於戒指型脈搏血氧儀之設計是一大問題。目前，尚未有明確的光源與檢測器放置的資訊用於量測血氧濃度。因此，在本篇研究中，我們使用光學人體組織模擬來調查最佳光源以及檢測器的放置位置。此外我們藉由模擬結果設計了一個無線穿戴式戒指型多感測器之脈搏血氧儀，並且與模擬結果做驗證。最後，無線穿戴式戒指型多感測器之脈搏血氧儀亦與市售指尖式脈搏血氧儀做相關性比較並評估其性能。

Pulse oximeter is a popular instrument to monitor the arterial oxygen saturation (SPO2). Although fingertip-type pulse oximeter is the marketing mainstream at present, it is still inconvenient for long-term monitoring, in particular, under motion. Therefore, the development of wearable pulse oximeter, such as ring-type pulse oximeter, can effectively solve the above issue. However, the tissue structure of finger base is complex, and there is lack of detail information for the effect of the light source and detector placement on measuring SPO2. In this study, the practicability of ring-type pulse oximeter with multi-detectors was investigated by optical human tissue simulation. The optimal design of ring-type pulse oximeter, that can provide the best efficiency of measuring SPO2, was discussed. The efficiency of ring-type pulse oximeter with single detector and multi-detectors 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.