Patient Circuit
Puritan Bennett 540™ Ventilator User’s Manual
4-9
.
Figure 4-8.
Double Limb Patient Circuit
9. Place the exhalation valve (item 9) on the exhaust port.
10. Place a bacteria filter (item 10) between the exhalation valve (item 9) and the inlet port of the
ventilator exhalation block (item 11).
11. Connect one end of the small exhalation valve tubing (item 8) to the exhalation valve port of the
exhalation valve (item 11) and the other end onto the ventilator exhalation valve port.
shows details of the connections of the proximal pressure tube (
, item 6) and the
exhalation valve tube (
, item 8).
Figure 4-9.
Close-up of Exhalation Valve Tube and Proximal Pressure Tube
For both types of circuits, shown previously, you should connect the end of the proximal pressure
tube as close as possible to the patient (at the mask or cannula entry, if possible) so that the ventilator
can account for all load losses due to the circuit and its potential accessories. If this is not possible, it is
best to modify the LOW PRESSURE DISCONNECT triggering threshold by doing one of the following:
set the high VTI alarm limit for pressure modes or set low VTE alarm limit for all ventilation modes if
using a dual limb circuit.
PB540_0001_A
LUNG
10
6
4
11
9
8
7
5
3
1
2
NOTE: Although shown here, the
humidifier (item 2), water traps
(item 3), and their connecting
tubes are not included with the
patient circuit or ventilator.
Contact your supplier for more
information.
Proximal Pressure
Tube
Exhalation
Valve Tube
Inhalation Port
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