VARIABLE FLOW AND PRESSURE VENTILATION SYSTEM

摘要

A ventilation system supplies a gas mixture that is humidified and heated through a proportional valve (22) which is a fail closed and normally closed servo control valve positioned proximate a patient. The proportional valve (22) is operated by a controller that regulates the pressure and the mode (e.g., high frequency, normal respiration, combinations) gas is delivered to the patient through a nozzle (30) connected to the endotracheal tube (42). The nozzle (30) has an exhaust connected to it and a pressure sensor (44) through a pressure sensing port. The exhaust is a capped corrugated tube that is heated and perforated to allow air to escape, to muffle gas and respiration noises, and to trap moisture.