2-20
Narkomed GS Operator’s Instruction Manual
Draeger Medical, Inc.
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 GS'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 Draeger Medical
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 GS, the PEEP is approximately 2 cm
H
2
O.
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 Figure 2-12.
Содержание Narkomed GS
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