Abstract: A passive valve for use as a fixed leak valve. The valve includes a body having an internal chamber, first and second body ports in fluid communication with the chamber with the first port configured for fluid communication with a patient connection and the second body port configured for fluid communication with a ventilator, a body passageway in fluid communication with the chamber and with ambient air exterior of the body, and a check valve seal positioned to seal the body passageway to permit the flow of gas within the chamber through the body passageway to the exterior of the body and to prevent the flow of ambient air exterior of the body through the body passageway into the chamber. In alternative embodiments, the valve is incorporated into the patient connection or constructed as a separate part connectable to the patient connection.

Abstract: A system and method for vehicle design and manufacture. The method includes designing a vehicle, building a pilot vehicle of the designed vehicle, installing a telematics units in the pilot vehicle, configuring the telematics unit to monitor systems of the pilot vehicle during vehicle operation, operating the pilot vehicle in a captured test fleet, obtaining data from the telematics unit during the operating in a captured test fleet, altering vehicle design data in response to the obtained data and, building a production vehicle with the design influenced by the altered vehicle design data.