Covidien Puritan Bennett 540, User Manual, Page: 67 / 141

Patient Circuit
Puritan Bennett 540™ Ventilator User’s Manual
4-7
4.4.1 Choosing the Patient Circuit Type
Single limb circuits are used with breathing modes where spirometry measurements are not required,
and double limb circuits are used with breathing modes where spirometry is required. Be sure to
choose the appropriate circuit in the menu preferences.
4.4.2 Installing the Patient Circuit
The patient circuit is mounted depending on the setup of the circuit used and the accessories used.
The following procedures describe the installation of the patient circuit with a humidifier. To add
other accessories, refer to the installation instructions for the specific accessories used.
To connect a single limb circuit do the following and refer to Figure 4-7 :
1. Inspect the components of the patient circuit for any signs of damage, such as cracks (which might
cause leakage). Do not use damaged components to assemble the patient circuit.
2. Install the bacteria filter (item 1) on the TO PATIENT outlet port, as shown.
3. Attach one end of the short circuit tubing (item 4) to the filter (item 1).
4. Attach the other end of the circuit tubing (item 4) to the inlet port of the humidifier (item 2).
5. Place a water trap (item 3) between the outlet port and the inlet ports of the exhalation valve (item
5).
6. Ensure the exhalation valve (item 5) is placed at the level of the patient.
7. Connect one end of the proximal pressure tubing (item 6) to the proximal pressure port on the
exhalation valve (item 5) and the other end onto the ventilator patient pressure port (item 8).
8. Connect one end of the exhalation valve tubing (item 7) to the exhalation valve port on the
exhalation valve (item 5) and the other end onto the ventilator exhalation valve port (item 9).
WARNING
•
The patient circuit is intended for single use by a single patient and should be changed according to the
manufacturer’s recommendations. Refer to the instructions for use supplied by the manufacturer of the
patient circuit (included with the ventilator).
•
Before assembling or reassembling the patient circuit—and on a daily basis—inspect the hoses and all
other components to ensure that there are no cracks or leaks and that all connections are secure.
•
To ensure correct performance of the ventilator, the patient circuit used must be one of those
recommended by Puritan Bennett in this manual. The connections of the outlet towards the patient and
the return to the exhalation block (with a double limb circuit) must be made with a 3.6 feet (1.10 m) to
6.6 feet (2.00 m) long tube (between the ventilator and the patient). The tube must conform to
applicable standards and be fitted with Ø 22 mm terminals that also conform to standards. Ensure that
the length and the internal volume of the patient circuit are compatible with the patient’s tidal volume:
a ringed tube Ø 22 mm for adults, and a ringed tube Ø 15 mm for pediatric patients with a tidal volume
lower than 200 ml.
•
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.
•
Users must always possess an additional circuit and valve while using the Puritan Bennett 540™
Ventilator.