DISEÑO E IMPLEMENTACIÓN DE UN OXÍMETRO DE PULSO BLUETOOTH DE BAJA ENERGÍA (DESIGN AND IMPLEMENTATION OF A BLUETOOTH LOW ENERGY PULSE OXIMETER)
Resumen
Recientemente, oxímetros de pulso comerciales se han utilizado masivamente para monitorear frecuencia cardiaca (FC) y saturación periférica de oxígeno (SpO2) en personas infectadas con COVID-19. El monitoreo de estos signos vitales es relevante para detectar oportunamente casos de hipoxemia. Sin embargo, investigaciones recientes mostraron que las mediciones realizadas con este tipo de oxímetros son inexactas. Además, estos carecen de módulos de comunicación para habilitar novedosos sistemas de monitoreo remoto. En este trabajo se presenta un sistema embebido biomédico (SE-BM) diseñado para medir y transmitir hacia dispositivos Bluetooth LE, señales de fotopletismografía (PPG), FC y SpO2. La evaluación del prototipo se realizó examinando la morfología de las señales PPG digitalizadas. Además, se determinó el error y concordancia entre mediciones de FC y SpO2 proporcionadas por el SE-BM y por un oxímetro de pulso FDA. Los resultados obtenidos confirman que el sistema embebido propuesto entrega mediciones confiables en los casos evaluados.
Palabras Clave: Fotopletimografía, MAX30101, oxímetro inalámbrico, PIC18F.
Abstract
Recently, commercial pulse oximeters have been widely used to monitor heart rate (HR) and peripheral oxygen saturation (SpO2) in people infected with COVID-19. The monitoring of these vital signs is relevant to timely detect cases of hypoxemia. However, recent works has shown that measurements performed with this kind of oximeters are inaccurate. Furthermore, these do not have communication modules to enable novel remote monitoring systems. This paper presents a biomedical embedded system (SE-BM) designed to measure and transmit to Bluetooth LE devices, photoplethysmography (PPG), HR and SpO2 signals. Prototype evaluation was performed by examining the morphology of digitized PPG signals. In addition, the error and agreement between HR and SpO2 measurements provided by SE-BM and by an FDA pulse oximeter were determined. The results obtained confirm that the proposed embedded system delivers reliable measurements in evaluated cases.
Keywords: MAX30101, photopleismography, PIC18F, wireless oximeter.
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