Automated ventilator

A ventilator comprising:

• a housing;
• a reservoir within the housing, the reservoir comprising:
• an internal chamber;
• an air inlet port configured to place the internal chamber in fluid communication with atmospheric air outside the reservoir;
• and
• an oxygen inlet port configured to place the internal chamber in fluid communication with a source of oxygen;
• a primary blower comprising:
• an air inlet in fluid communication with the internal chamber of the reservoir, and
• an air outlet configured to be placed in fluid communication with an inspiration tube that is located external of the ventilator housing;
• a secondary blower comprising a PEEP blower and having an air inlet and an air outlet;
• an exhalation tube for receiving exhaled gas;
• an exhalation port configured for being placed in fluid communication with the exhalation tube receiving exhaled gas;
• an exhalation conduit connected to the exhalation port;
• an exhalation valve that is configured to control flow through the exhalation port and/or through the exhalation conduit, the exhalation valve being closed during an inspiration phase and open during an exhalation phase, and comprising:
• a chamber;
• an exhalation flow passage comprising:
• an inlet coupled to and in fluid communication with the exhalation conduit to receive exhalation gas coming from exhalation port;
• and
• an outlet configured to discharge exhalation gas;
• an opening providing fluid communication between the inlet and the outlet;
• and
• a selecting element operating between the chamber and the opening of the exhalation flow passage, the selecting element being selectively movable between a closed position and an open position, flow through the opening of the exhalation flow passage being prevented in the closed position and allowed in the open position;
• and
• a switch valve comprising:
• a first inlet connected to the primary blower;
• a second inlet connected to the secondary blower;
• and
• an outlet connected to the chamber,
• wherein the internal chamber of the reservoir presents a volume for gas mixing extending at least between the air inlet port, the oxygen inlet port and the primary blower air inlet, said volume being configured for allowing mixing of air entering in the reservoir via the air inlet port with oxygen entering in the reservoir via the oxygen inlet port before any gas reaches the primary blower air inlet, and
• wherein the switch valve is configured to be switched at least between a first condition, where the switch valve connects its first inlet to its outlet to put the air outlet of the primary blower in fluid communication with the chamber and a second condition, where the switch valve connects its second inlet to its outlet to put the air outlet of the secondary blower in fluid communication with the chamber.