Implementación de un prototipo electrónico para el monitoreo de temperatura, frecuencia cardiaca y oxigenación en la sangre en pacientes del centro odontológico "Fass Dental" de la ciudad de Ambato.

Abstract

The aim of this graduate research project was to implement a prototype for monitoring temperature, heart rate and oxygen saturation, for patients in a dental center. To meet this objective, a device with specific electronic requirements was designed. Non-invasive biomedical sensors with wearable technology were researched and the infrared temperature sensor MLX90614 was chosen for its high precision non-contact measurements and the MAX30100 sensor that integrates a heart rate sensor and pulse oximeter. The signals from the sensors are sent to an ATmega328 microcontroller through I2C communication where the data is processed and projected on a 96” OLED Screen, as well as being simultaneously sent to an Android-compatible mobile application through a Bluetooth personal area wireless network. In order to establish communication between hardware and software, algorithms were designed in the programming language C++ and JavaScript in Blockly. In addition, the device can work through a fixed or portable power supply. Tests determined that the prototype is capable of measuring variables simultaneously, resulting in a reliability of ~ 98%, with an absolute error for body temperature of 0.45 ℃, heart rate of 1.13 bpm and oxygen saturation 1.4%. Compared with other commercial devices with similar characteristics, but with different monitoring variables, the prototype is up to 50% cheaper, and when compared to other prototypes it is 30% cheaper. It was concluded that the system is capable of receiving vital sign parameters on a screen and on a mobile device, with data updating every second. Correct use of the prototype is recommended, with a higher capacity battery to guarantee long-term monitoring.