Assembly and preparation
72 Instructions for use Perseus A500 SW 2.0n
Observing resistance and compliance
Accessories or accessory components such as
filters affect the dead space, compliance, or
resistance of the breathing circuit.
In addition, changes in resistance and compliance
arise over time as a result of moisture in the
breathing gas or deposits of secretions.
Calculating the resistance of the breathing
system and connected accessories
The sum of the resistances in the inspiratory limb
must not be less than –6.0 hPa (cmH
2O). The sum
of the resistances in the expiratory limb must not
exceed 6.0 hPa (cmH
2O).
Only include resistance data in calculations that
were taken under the same flow conditions:
The following formula is used to calculate the
resistance (R):
R
Inspiration =
R
Breathing system_insp - RInsp hose - RBreathing bag hose
- R
Insp filter (port) - RInsp filter (Y-piece)
RExpiration =
R
Breathing system_exp + RExp hose + RExp filter (port) +
R
Exp filter (Y-piece)
If necessary, take into consideration additional
parts such as water traps or additional hoses. The
specifications for the resistance of the breathing
system can be found on page 249. The
specifications for all other accessories can be
found in the respective instructions for use.
In these instructions for use, the specifications for
the resistance in the inspiratory limb are regarded
as negative values. The resistance values given in
the instructions for use for the accessories must
therefore be subtracted from the inspiratory
resistance of the breathing system.
CAUTION
Risk due to accessory components in breathing
circuit
When using additional components or hose
configurations which deviate from the standard
breathing circuit, the inspiratory and expiratory
resistance values may be increased beyond
standard requirements.
– When such configurations are used, the user
must pay special attention to the measured
values.
– After adding or replacing components such as
breathing hoses, vaporizers, or soda lime,
perform a leak test.
CAUTION
Risk due to misleading data
Exchanging breathing hoses, filters, vaporizers,
or soda lime can change the determined leakage
values or compliance values of the anesthesia
machine and thus affect therapy.
– Perform a leakage test after replacing
breathing hoses, particularly flex hoses,
vaporizers or soda lime.
– Perform a leakage test after changing the
length of flex hoses.
CAUTION
Risk due to changed hose lengths
Changed hose lengths can change resistance
and compliance. Especially for neonates, this
may cause increased or decreased ventilation
volumes.
For neonates in particular, do not use flex hoses.
Patient category Flow
Adults 30 L/min
Pediatric patients 15 L/min
Neonates 2.5 L/min
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