Av2+ Ventilator - Dräger Narkomed 2B Operator's Instruction Manual

Section 2
General Description

AV2+ Ventilator

The AV2+ anesthesia ventilator is a volume preset, time cycled, pressure
limited ventilator with electronic timing, pneumatic circuitry and
independent controls for frequency, inspiratory to expiratory (I:E) ratio,
inspiratory flow rate, tidal volume, and inspiratory pressure limiting.
Pneumatic power (bellows drive gas) to the ventilator is supplied
through the hospital pipeline supply or through reserve cylinders on the
anesthesia machine. The pressure of the supply gas must be between 40
and 60 psi. The ventilator will not function properly if this pressure
drops below 32 psi. Electrical power is supplied by the Narkomed 2B's
AC power source, or, in event of AC power failure, by the backup
battery. A fully charged battery can power the ventilator for
approximately 30 minutes.
The anesthesia ventilator is designed for use with a North American
Dräger absorber system, which incorporates a manual/automatic selector
valve. This valve allows you to select either the breathing bag and
adjustable pressure limiter (APL) valve for manual ventilation, or the
ventilator bellows for automatic ventilation.
During automatic ventilation, the manual/automatic selector valve
isolates the absorber's APL valve from the breathing system. To
compensate for the continuous introduction of fresh gas into the
breathing system, the ventilator incorporates a relief valve mounted
behind the bellows chamber.
When the bellows is completely filled, any excess gas in the system is
released to the scavenging system through the ventilator relief valve. As
in any ascending bellows, the force needed to overcome gravity acting on
the bellows causes a positive end-expiratory pressure (PEEP) within the
breathing system. For the Narkomed 2B, the PEEP is approximately
2 cmH O.
2
The pressure limit control allows you to set the peak inspiratory
pressure produced by the ventilator in order to help prevent barotrauma.
The pressure limit control can also improve ventilation for patients with
reduced lung compliance (neonatal/pediatric patients and patients with
adult respiratory distress syndrome), because it limits the peak
inspiratory pressure during the inspiratory phase of ventilation.
The AV2+ ventilator is shown in the following drawing.
2-19