System for Multi-Parametric Physiological Measurements

U sklopu ovog rada opisana su načela rada i izvedbe sustava za višeparametarsko mjerenje fizioloških veličina. Sustav je zasnovan na EKG pojačalu s mogućnošću mjerenja disanja, realiziran integriranim krugom ADS1292R. Sustav sadržava: pulsni oksimetar realiziran pomoću integriranog kruga MAX30100, sklop za prikupljanje podataka s dva programabilna pojačala MAX9939 i analogno-digitalnim (A/D) pretvornikom MAX1300, biomehaničku vagu realiziranu pomoću integriranog kruga AFE4300 koji mjeri masu tijela pomoću tenzometarskog mosta, mjerenje temperature realizirano je pomoću integriranog kruga MAX31855 i odgovarajućeg termopara. Omogućeno je mjerenje impedancije čovjekova tijela postavljanjem četiri elektrode na ekstremitete: lijeva ruka i noga, desna ruka i noga. Svi navedeni sklopovi povezani su na mikrokontroler TM4C123GH6PZT. Sustav komunicira s računalom pomoću USB sabirnice čije su podatkovne i naponske linije galvanski odvojene te pružaju zaštitu do 5 kV što je u skladu s važećim normama za medicinske uređaje.In this paper, the principles of operation and performance of the system for multiparametric measurement of physiological attributes are described. The system is based on an electrocardiogram amplifier built around ADS1292R integrated circuit. The system includes: pulse oximeter built around MAX30100 circuit, data acquisition circuitry with two programmable gain amplifiers MAX9939 and an analog-to-digital (A / D) converter MAX1300. A biomechanical scale is built around the integrated circuit AFE4300 that measures body mass with strain gauge transducers. Temperature measurement is performed with the integrated circuit MAX31855 and the corresponding thermocouple. It is possible to measure impedance of the human body by placing four electrodes at the extremities: left arm and leg, right arm and leg. All integrated circuits are connected to the TM4C123GH6PZT microcontroller. The system communicates with the computer via USB bus with data and voltage lines galvanically isolated and providing high voltage protection up to 5 kV, which thus complies with the current medical safety standards