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Fig. 2 | BMC Biomedical Engineering

Fig. 2

From: Efficacy and safety testing of a COVID-19 era emergency ventilator in a healthy rabbit lung model

Fig. 2

Schematic of the three-way, two-position pneumatically driven ventilator valve from the outlet side of an infant BVM used with the FALCON. a The FALCON was connected to the inspiratory side of the valve with a barometric pressure sensor to capture inspiratory pressure waveforms, and a PEEP valve was connected to the expiratory side with a second pressure sensor to capture expiratory pressure waveforms. The common line was used to connect the ventilator circuit to the rabbit, and a flow sensor was placed between the valve and rabbit to capture flow waveforms. b During inspiration, the FALCON’s air pump generated a positive pressure (PFALCON) which was greater than the airway pressure in the rabbit (Prabbit), causing the valve to open between the inspiratory side and the common and air to flow into the rabbit lungs. c During expiration, the turbine in the air pump rapidly slowed down, and PFALCON rapidly dropped below the Prabbit, at which point the valve shut towards the inspiratory limb and opened to the expiratory outlet, allowing outflow of air from the rabbit lungs into atmosphere. d When Prabbit reached the pressure set on the PEEP valve (PPEEP), the PEEP valve closed, and air ceased to flow out of the rabbit lungs

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