Show me the SO2: real-time LED oximetry display on multimodal wearable devices

Yusuf A. Bhagat; Krishnaveni Das; Thong Bui

doi:10.1117/12.2588173

12 April 2021 Show me the SO2: real-time LED oximetry display on multimodal wearable devices

Yusuf A. Bhagat, Krishnaveni Das, Thong Bui

Proceedings Volume 11757, Smart Biomedical and Physiological Sensor Technology XVIII; 1175703 (2021) https://doi.org/10.1117/12.2588173
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

The current landscape of clinical vital signs monitoring solutions including those designed for wound monitoring emphasizing blood oxygen saturation (SO₂) or oximetry remain limited in their scope owing to the lack of miniaturization, portability, disposability and visualization of real-time data readouts. To address such limitations, we present two wearable proof-of-concept oximeters with multi-digit, 7-segment light emitting diode (LED) displays, a ring and a patch, showcasing transmissive and reflective oximetry solutions, respectively, along with other distinctly integrated modalities such as non-coplanar electrocardiography (ECG), temperature sensing, activity and fall detection. Two miniature Bluetooth-enabled oximetry devices are showcased. The technology encompasses solutions such as blood oxygen saturation (SO₂) mapping based on reflective oximetry (4 x 4 array of LEDs and photodiodes), non-coplanar ECG using inkjet dispensed, 8 μm-thick Silver-Silver Chloride electrodes, central and peripheral temperature sensors, an accelerometer and an organic LED (OLED) display layer on a rigid flex hybrid printed circuit board (PCB) for reporting quantitative metrics from either the reflective oximeter or ECG on a wearable patch. A wearable smart ring includes transmission oximetry sensors (LEDs and photodiodes), integrated on a single flexible PCB. Here, additional sensors comprise temperature and an accelerometer. Both devices, the ring and patch comprise LED display layers for showcasing real-time quantitative parameters such as SO₂ or heart rate (HR) and HR variability.

Conference Presentation

Citation Download Citation

Yusuf A. Bhagat, Krishnaveni Das, and Thong Bui "Show me the SO2: real-time LED oximetry display on multimodal wearable devices", Proc. SPIE 11757, Smart Biomedical and Physiological Sensor Technology XVIII, 1175703 (12 April 2021); https://doi.org/10.1117/12.2588173

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