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Example:
Compressed-gas supply
Cylinder pressure (at cylinder pres-
sure gauge):
200 bar
Available compressed-gas supply,
200 x 3 = approx. 600 L
Usage period
Switch setting at Oxylog:
Minute volume MV: 10 L/min
Usage period
600 L
= approx. 54 min
(10 + 1) L/min
Switching to )jAir Mixes reduces the gas
consumption by 50%, i. e. the usage
period is increased to roughly 100 min.
Following device upkeep and assembly,
the Oxylog is to subjected to the
following functional checks:
Testing ventilation ratio
Device settings
Pneum. main switch
M V
Ventilation ratio
Switch
Seal non-rebreathing valve at patient
connection and using stopwatch take
the time t for 10 complete cycles and
determine ventilation frequency f
f = & min-'
The ventilation ratio of the Cxylog
should be between 13 and 17 min' .
Testing safety valve
With the same device settings and with
the patient connection sealed at the
non-rebreathing valve the max. airway
pressure should be between 50 and 80
mbar.
Testing compressed-gas supply and
minute volume
Insert catheter adapter, size 5 (M 25569)
into patient connection of non-rebreath-
ing valve.
Read off the max. inspiration pressure
at the airway pressure gauge for the MV
settings: 7, 15,20.
M V 7 L/min
Airway pressure 4 to 8 mbar
MV 15 L/min
Airway pressure 15 to 24 mbar
MV 20 L/min
Airway pressure 28 to 38 mbar
The Oxylog should switch at regular
intervals from inspiration to expiration.
The operating prerequisites (at least 2
bar at 60 L/min at Oxylog) are checked
indirectly in the MV = 20 L/min setting.
Remove catheter adapter from patient
connection; the device is now ready for
operation.
3 L/min
The airway pressure gauge must be
15 mini'
observed all the time so that incorrect
ventilation can be detected in due time,
thus precluding risks for the patient!
Set ventilation ratio and minute volume
(MV) to suit patient concerned.
For rapid presetting:
The ventilation ratio and minute volume
(MV) scales each have three colour
bands for the specific patient groups
infants, children and adults.
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