A portable mechanical ventilator having a ROOTS® blower is configured to provide a desired gas flow and pressure to a patient circuit. The mechanical ventilator includes a flow meter operative to measure gas flow produced by the ROOTS® blower and an exhalation control module configured to operate an...http://www.google.es/patents/US8118024?utm_source=gb-gplus-sharePatente US8118024 - Mechanical ventilation system utilizing bias valve
Mechanical ventilation system utilizing bias valve
