AN ELECTRO PNEUMATIC ANAESTHESIA VENTILATOR FOR CONTROLLED VENTILATION: DESIGN AND DEVELOPMENT

摘要

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.