The MicroVent 1 is a dual mode ventilator. It will operate to deliver standard intermittent positive pressure ventilation (IPPV) or it will operate to deliver high frequency oscillatory ventilation (HFOV). The entire breathing system has a volume of less than 1cc.  There are just four parameters to control, Oxygen flow, Frequency (breaths per minute), Amplitude (tidal volume) and Mean Airway Pressure (Mean P_aw). In operation a small flow of fresh gas, in the range of 50-100ml/min, is set.  This gas can be oxygen as provided by the built-in flow meter or any mixture of gases you provide from an external source.  This gas may flow through an anesthetic vaporizer if you desire using gas anesthetics, then on to the breathing system where it passes the patient connection, flows through an open needle valve and on to your scavenging system as required.  The animal may breathe spontaneously from this stream of gas as it passes the patient connection at all times.  The needle valve is used to adjust Mean P_aw as seen on the pressure manometer.  As the valve is closed, gas flow is restricted causing pressure in the breathing system and thus in the animal’s lungs to increase. This Mean P_aw will maintain the expanded lungs permitting continuous gas exchange with a minimum of atelactatic alveoli.
 

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