6 Basic principle
COMBIBAG, the first manual resuscita-
tor with a 2-stage safety valve.
By now, pressure relief as a function of the variable
risks present in ventilation via face mask or endotra-
cheal tube remained unsolved.
The majority of manual resuscitators only have a
pressure limit at 50 - 60 mbar (5-6 kPa (≈ 50-
60 cmH
2
O)), a reasonable limit adapted to healthy
lung conditions.
With use of manual resuscitators and face mask ven-
tilation in inexperienced hands, however, there is al-
ways the risk that anxiety of the administrator and
the eager trial to produce very effective ventilation
may lead to an inflation of the stomach at pressures
above 20 mbar (2 kPa (≈ 20 cmH
2
O)) resulting in re-
gurgitation with following apiration. Moreover,
there is the risk with ventilation of children indepen-
dant from face mask or endotracheal tube that high
ventilation pressures may hurt the lungs.
With the COMBIBAG 2-stage safety valve it is now
possible to set a pressure limit:
• of 20 mbar (2 kPa (≈ 20 cmH
2
O)) for mask
resuscitation child ventilation and
• one of 60 mbar (6 kPa (≈ 60 cmH
2
O)) for resus-
citation via an endotracheal tube with adults.
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