Design and simulation of a mechanical respirator

Abstract

The aim of this project is to design and simulate a mechanical ventilator, which is used to maintain, or improve the functional capabilities of persons with disabilities in breathing period. This project presents a mathematical model of Pressure Controlled Ventilator (PCV) signal. This mathematical model represents the respiratory activities and some important controlled parameter during mechanical ventilation are considered. The mathematical model is expressed and modelled using periodic functions with inequalities to control the beginning of inspiration and expiration durations. The created mathematical model of PCV signal is combined with an existing multi compartmental model of respiratory system that is modified and developed in the internal parameters - compliances (C) to test the created mathematical model. Moreover, in order to verify the mathematical model, a simulation using MATLAB and its SIMULINK library is done. The obtained simulation results as pressure, flow and volume agree well with the real and experimental curves, which confirms the accuracy of our model.