[303721] Artigo – CBM – Congresso Brasileiro de Metrologia

Resumo: Intensive care equipment in premature neonates need specific pulmonary ventilation settings, due to their unique lung compliance and resistance, so as to avoid hyperventilation with large tidal volumes (VT) that can lead to lung injury. Thus, highfrequency ventilation has emerged as a strategy for newborns and preterm infants since it uses a volume below dead space at extremely high frequencies (between 5 and 15 Hz; 300-900 cycles/min), making it possible to obtain higher mean pressures in the airway with minimal volumetric variation in the alveolus. Lung ventilators need to be tested to assess their functioning and essential performance, and in Brazil the ISO IEC 80601-212:2020 standard describes the required performance tests with parameter tables for compliance, resistance, tidal volume, respiratory rate and pressure that simulate the ventilation characteristics of a newborn baby. The analysis of the frequency response of the sensors that make up the pulmonary ventilation system is important in the design and development phase of the medical equipment industry, and for this purpose a device that generates a sinusoidal signal for the frequency range of interest in ventilation therapy for premature neonates was developed. This system has a load that simulates the resistance and compliance parameters described in the regulatory standard. The device was characterized in terms of its linearity and frequency response, in order to enable evaluation of the ventilator transducers in respiratory rates, compliance parameters and pulmonary resistances that simulate a premature neonate.