Design and development of microcontroller based human airway pressure measurement system with real time graphical display for anaesthesia ventilator

Abstract

A microcontroller based hardware design and system software associated with the graphical visualization of the airway pressure data acquisition system has been designed and developed, and successfully incorporated in indigenous prototype of anaesthesia ventilator. An inexpensive airway pressure monitoring system based around 80C31 microcontroller with RAM, EPROM, AD574 ADC, peripheral interface devices and graphical LCD etc., is a module of the indigenously developed instrument. What has been envisaged here is to get a real time pressure waveform on LCD. Air pressure changes over a respiratory cycle. This makes anaesthetist to have a feeling of how air pressure in the tract changes with time. An accurate and sensitive piezoresistive type of air pressure sensor has been used outside the mouth and inside the piping.