System and process for supplying respiratory gas under pressure or volumetrically

A system for supplying respiratory gas to a patient according to respiratory cycles, the system comprising:

• a housing,
• a turbine inside the housing,
• a patient inspiration flow outlet on the side of the housing and in flow communication with the turbine,
• an exhalation valve interface on the side housing,
• a proximal pressure interface on the side of the housing,
• an exhalation flow inlet on the side of the housing and defining a portion of an exhalation flow path,
• a first flow sensor inside the housing in flow communication with the patient inspiration flow outlet capable of generating a first flow signal,
• a first pressure sensor inside the housing in pressure communication with the proximal pressure interface capable of generating a first pressure signal,
• a second flow sensor inside the housing in flow communication with the exhalation flow inlet capable of generating a second flow signal indicating a flow rate through the exhalation flow path,
• a second pressure sensor inside the housing in pressure communication with the exhalation valve interface capable of generating a second pressure signal,
• wherein the exhalation valve interface and the second pressure sensor are located along an exhalation valve control path separate from the exhalation flow path,
• a central processing unit in electrical communication with the first and second pressure and flow sensors to receive pressure and flow signals therefrom, and
• a turbine speed controller board in electrical communication with the central processing unit and the turbine, wherein the central processing unit and the speed controller board coact to control the rotational speed of the turbine based on at least two pressure and/or a flow signals from the first and second pressure and flow sensors.