Covidien Puritan Bennett 540, User Manual, Page: 71 / 141

Humidifier
Puritan Bennett 540™ Ventilator User’s Manual
4-11
Figure 4-10. Air Inlet Filter
Bacteria Filter
It is highly recommended that you install an bacteria filter (see Figure 4-11 ) on both single and double
limb circuits. In a double limb configuration, two bacteria filters are used: one at the port labeled TO
PATIENT, and the other at the port labeled FROM PATIENT.
•
Connected to the TO PATIENT port:
This filter protects the ventilator from contamination by the patient (primarily, rebreathed air that
contains a high concentration of carbon dioxide). Refer to
Figure 4-8 , item 1.
•
Connected to the FROM PATIENT port:
This filter protects the internal expiratory flow sensor from any obstruction from the gases exhaled
by the patient. Refer to
Figure 4-8 , item 10.
Figure 4-11. Bacteria Filter
Refer to the manufacturer’s instructions for more information about the use and maintenance of the
bacteria filter(s).
4.6 Humidifier
The humidifier ( Figure 4-12 ) adds moisture (water vapor) and warms the air in the patient circuit. It is
inserted into the patient circuit between the main outlet and the patient (refer to Figure 4-7 and
Figure 4-8 ).
Caution
The air inlet filter is not reusable. Do not attempt to wash, clean, or reuse the filter.