Dräger Primus SW 4.5n Instructions For Use Manual page 66

Assembly and preparation
Before the selftest is performed, all accessories* to
be used must be connected. The extendable hoses
must be drawn out to the length required by the
user. This is the only way of ensuring that the com-
pliance of the breathing system and breathing
hoses is determined correctly and a corrected tidal
volume is automatically applied during volume-con-
trolled ventilation.
Calculating the resistance of the breathing sys-
tem and connected accessories
To keep the patients' work of breathing as low as
possible, according to ISO 8835-2 and
ISO 80601-2-13 a total inspiratory and expiratory
resistance of 6.0 hPa (cmH
be exceeded.
The "Technical Data" chapter states the inspiratory
and expiratory breathing resistance of the breath-
ing system, not including the breathing hoses. This
allows for the calculation of the resistance of the
breathing circuit using different hose sets and/or fil-
ters.
The following formula are used to calculate the re-
sistance (R):
R =
Inspiration
R + R
Breathingsystem_insp
+ R
Filter(port) InspFilter(Y-piece)
R =
Expiration
R + R
Breathingsystem_exp
R
ExpFilter(Y-piece)
When calculating the resistance, only accessory re-
sistance values and peak flows must be used that
are applicable for the respective accessory cate-
gory and patient category, e.g., resistance value for
adults (60 L/min), for children (30 L/min), or for ne-
onates (5 L/min).
* If necessary, take into consideration additional parts such
as water traps or additional hoses.
66
O) at 60 L/min may not
2
+ R + R
InspHose BagHose
+ R
ExpHose ExpFilter(port)
Insp-
+
Instructions for use Primus SW 4.5n