Dräger Medical Fabius Tiro Technical & Service Manual page 39

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Function Description Fabius Tiro
The safety valve of the patient system makes sure that no pressures greater
than 75 cmH2O build up in the system.
During ventilation, the pressure limit (Pmax) can be adjusted on the control
box.
Volume/Pressure Control Mode: Inspiration
During inspiration, the PEEP/Pmax valve remains closed. The control pres-
sure present at the PEEP/Pmax valve varies with the set pressure limit
(Pmax).
The pressure generated by the ventilator's piston closes the fresh-gas decou-
pling valve. The gas mixture (expiratory gas and fresh gas) flows through the
inspiratory valve, the O2 sensor, the inspiratory hose, and through the Y-
piece into the lung. The pressure sensor measures the airway pressure. The
ventilation pressure cannot exceed the pressure limit (Pmax) set on the con-
trol box because the PEEP/Pmax valve opens. The fresh gas then fills the
breathing bag.
Any excess fresh gas flows through the open APL bypass valve, and through
the non-return valve into the anesthetic gas scavenging system.
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Dräger Medical AG & Co. KGaA 6020.002 Revision B Released