An Electro Pneumatic Anaesthesia Ventilator for Controlled Ventilation: Design and Development

J. Kaur, J. Kumar, P. Kapur, and B.S. Sohi (India)

Keywords

Anaesthesis ventilator, airway pressure, piezoresistive pressure sensor, microcontroller, graphical display, tidal volume, respiration rate, inspiratory flow rate, minute volume

Abstract

Anaesthesia ventilators are used when artificial ventilation needs to be maintained for a long time to support human breathing at different stages of treatment and pathologies. These are sophisticated equipment with a large number of controls in maintaining proper and regulated breathing activity. Breathing oxygen from anaesthesia delivery system is stored inside a rubber bellow for delivering to the patients by squeezing the bellow with controlled amount of exerting pressure on the rubber bellow. Presently available ventilators use a electro-pneumatic system to control flow, pressure and volume of supplied and extracted air. In this paper, authors have described design of a versatile, inexpensive and fully engineered prototype of anaesthesia ventilator. It is a pneumatically driven, electronically controlled time cycled system used for performing all functional requirements of respiratory support. In this ventilator, a set volume of gas is delivered to the patient in a predetermined period of time and the same is exhaled by the patient over another interval of time constituting a complete cycle of respiration. The developed device controls all parameters of breath such as tidal volume, respiration rate, I:E ratio and inspiratory flow rate.

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