Organic–Inorganic Hybrid Approach to Pulse Oximetry Sensors with Reliability and Low Power Consumption,ACS Photonics

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Organic–Inorganic Hybrid Approach to Pulse Oximetry Sensors with Reliability and Low Power Consumption
ACS Photonics ( IF 6.5 ) Pub Date : 2021-11-16 , DOI: 10.1021/acsphotonics.1c01161
Hyeonwoo Lee ₁ , Woochan Lee ₁ , Hyunwoo Lee ₁ , Sungyeon Kim ₁ , Marco Vinicio Alban ₁ , Jinouk Song ₁ , Taehyun Kim ₁ , Seunghee Lee ₁ , Seunghyup Yoo ₁

Affiliation

The pulse oximeter (PO) is an essential healthcare sensor that monitors the heart rate and blood oxygen level. With the emergence of wearable form factors, its use is rapidly expanding from applications in clinical environments to fitness, daily activities, and point-of-care applications. However, the relatively high power consumption of commercial POs has been an obstacle to applying them to wearables, which generally have a limited on-board power source. In this work, we propose a hybrid reflection-type (R-type) PO that adopts inorganic light-emitting diodes (LEDs) and a wrap-around organic photodiode (OPD), which are conveniently integrated via lamination. The overall structure is carefully optimized to minimize direct coupling of light from the LEDs to OPDs and to maximize the meaningful signal through an optical simulation. In particular, we provide a method for optical simulation resolving the deepest layer visited by a photon that returns back to a specific point on the skin so that one can better estimate the relative portion of photons that penetrate deeply enough to contribute to the signal in R-type configuration. The resultant hybrid POs, in which red and near-infrared LEDs are alternately turned on, are shown to be operable with the average LED driving power as low as ca. 35 μW (at 25% duty), demonstrating their immense potential for wearable POs with practical viability.

中文翻译：

具有可靠性和低功耗的脉搏血氧饱和度传感器的有机-无机混合方法

脉搏血氧仪 (PO) 是必不可少的医疗保健传感器，可监测心率和血氧水平。随着可穿戴设备外形的出现，其用途正从临床环境中的应用迅速扩展到健身、日常活动和即时护理应用。然而，商用 PO 相对较高的功耗一直是将其应用于可穿戴设备的障碍，可穿戴设备通常具有有限的车载电源。在这项工作中，我们提出了一种混合反射型（R 型）PO，它采用无机发光二极管 (LED) 和环绕式有机光电二极管 (OPD)，它们通过层压方便地集成在一起。整体结构经过精心优化，以最大限度地减少光从 LED 到 OPD 的直接耦合，并通过光学模拟最大限度地提高有意义的信号。特别是，我们提供了一种光学模拟方法来解析返回到皮肤上特定点的光子访问的最深层，以便人们可以更好地估计穿透足够深的光子的相对部分，以对 R 型配置中的信号做出贡献. 由此产生的混合 PO，其中红色和近红外 LED 交替开启，显示可在平均 LED 驱动功率低至约 35 μW（占空比为 25%），展示了它们在具有实际可行性的可穿戴 PO 方面的巨大潜力。其中红色和近红外 LED 交替打开，显示可在平均 LED 驱动功率低至约 1 的情况下运行。35 μW（占空比为 25%），展示了它们在具有实际可行性的可穿戴 PO 方面的巨大潜力。其中红色和近红外 LED 交替打开，显示可在平均 LED 驱动功率低至约 1 的情况下运行。35 μW（占空比为 25%），展示了它们在具有实际可行性的可穿戴 PO 方面的巨大潜力。

更新日期：2021-12-15

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