Covidien Puritan Bennett 540, User Manual, Page: 70 / 141

Installation and Assembly
4-10
Puritan Bennett 540™ Ventilator User’s Manual
As a reminder: Ensure that the length and the internal volume of the patient circuit are compatible
with the tidal volume: ringed tube Ø 22 mm for adults and ringed tube Ø 15 mm for pediatric patients
with tidal volumes lower than 200 ml. Use, if necessary, a 22F-15M link on the outlet and a 15M-22M
link on the expiratory block for a double limb circuit.
4.5 Filters
The ventilator features two filter types:
•
air inlet filter
•
bacteria filter
Air Inlet Filter
Consisting of foam and fine particle filter media and located at the rear of the ventilator, this filter
cleans the air as it enters the ventilator. Refer to the figure below.
WARNING
.In the SIMV mode we recommend using a double limb circuit and leaving the VTE Min setting active in the
event that pressure losses are present on the patient circuit downstream from the proximal pressure link.
This is because in such cases the “PATIENT DISCONNECTION” alarm would not be systematically activated
in case of a disconnection of the circuit.
WARNING
•
When a nose mask or face mask is used in Non-Invasive Ventilation (NIV), the mask must NOT contain an
expiration aperture or exhaust port (no leakage).
•
The level of inspiratory resistance of the circuit and accessories (bacterial filter, humidifier, and so on)
must be as low as possible. Settings—particularly the LOW PRESSURE DISCONNECT alarm, High
inspired volume (High VTI), and Low inspired volume (Low VTI) settings—must be periodically adjusted
according to changes in the patient circuit resistance—especially when filters are replaced.
•
Resistance of the exhalation valve and accessories (water traps, filters, etc) must be as low as possible.
•
The exhalation valve must allow rapid discharge of the circuit pressure. Ensure that the exhalation valve
is always clean and its evacuation aperture (exhaust port) is never obstructed.
•
Do not start ventilation until you ensure that the device is suitably assembled, and that there is proper
clearance all around the unit. Ensure that the air inlet filter is properly installed and is not obstructed.
Also ensure that the patient circuit is suitably connected to both the ventilator and the patient and that
the patient circuit, including all hoses, is not damaged or obstructed.
•
Adding accessories to the ventilator breathing circuit, such as a humidifier and water trap(s), may result
in a decrease in tidal volume delivered to the patient due to the added compressible volume of the
accessory. Always assure that the patient is receiving the appropriate inspired volume when altering
the breathing circuit configuration.
WARNING
Regularly check the cleanliness of the air inlet filter located on the rear of the ventilator. Replace the filter
as often as necessary to maintain cleanliness—even before the recommended replacement period is over.
This is critical particularly when the ventilator is installed on a wheelchair, because environmental
conditions may cause the filter to become dirty more rapidly.