17
11.
INSTRUCTION FOR USE
11.1
Connection to the pneumatic supply
After the device has been connected to the power supply according to the
provided specifications, connect the pneumatic supply hose to the socket
placed on the pressure reducer installed on the oxygen tank. Insert then the
probe inside the socket on the connections side of the lung ventilator
pressing until it clicks, confirming the proper connection.
To verify the integrity of the electrical connection, slightly pull the connector
verifying that no disconnection happens.
For the pneumatic supply, check that it is properly connected slightly pulling
the probe doing a little rotation at the same time.
Connect the breathing tube to the output marked with “PATIENT CIRUIT” on the connections side of the lung ventilator. The tube must be
inserted for about 2,5 cm. If the insertion is difficult, the tube can be slightly rotated during insertion making the operation easier.
The breathing tube must not rotate easily and freely. If this happens, it is an obvious sign of damage to the hose or of its incompatibility with
the device.
In these conditions the device is ready for use, and this is identified by the green LED marked “EXT. SOURCE”.
To disconnect the device from the pneumatic supply, push the outer plastic part of the socket in axial direction while pulling out the probe.
11.2
Turn on the device
Turn on the device pressing on the button identified by the symbol “
”.
The device will perform an autodiagnostic test by turning on all LEDs for about 1 second and emitting 3 short sounds.
When this test is concluded, the device automatically start the ventilation in “Controlled mode” according to the set parameters.
If the device is not working or there are different visual or acoustic signals, refer to the paragraph explaining the warning signs or the section
TROUBLESHOOTING.
On the frontal panel will be displayed the ventilation mode, the breathing phases and any alarms or informations related to the power or
pneumatic supplies.
11.3
Setting breathing parameters
On the frontal panel there are 4 adjustment knobs. Breathing parameters must be adjusted
before
applying the mask to the patient. During
these adjustments, the physician using the device must consider the patient’s weight, the Tidal Volume required by the patient and its
clinical conditions.
Volume minute adjustment
The Volume minute is the volume of gas delivered to the patient in a minute. It differs from the delivered volume for each breath (or Tidal
Volume) as this is closely related to the breathing frequency according to the relation
𝑉𝑇 =
𝑉𝑜𝑙𝑢𝑚𝑒
𝑚𝑖𝑛𝑢𝑡𝑒
𝐹
.
The device allows setting between 2 and 20 L/min
Breathing frequency adjustment
Rotating the frequency adjustment knob, is possible to set the number of breaths per minute.
The frequency has consequences both on the tidal volume according to the mentioned relation and on the activation level of the high
pressure alarm. The high pressure alarm is activated at
25mbar
if the frequency is set higher than 20 breaths/min and at
60mbar
if the
frequency is less than 20 breaths/min.
The frequency setting, because of the constant I:E ratio, has also a direct effect on the duration of the inspiration phase according to the
relation:
𝑇
𝑖𝑛𝑠𝑝
=
60
(3∗F)
, where F is the frequency set by the operator. The time so calculated is expressed in seconds.
The device allows settings between 5 and 40 breaths/min (bpm).
Pressure limit adjustment
Through this setting, is possible to limit the maximum pressure in the breathing circuit to the desired value. If the pressure limit is
exceeded, the volume minute is no longer guaranteed.
The device allow settings between 20 and 60mbar.
Trigger adjustment
The trigger is a device able to synchronize the insufflation with the beginning of spontaneous breathing of the patient. The lung ventilator
doesn’t consider the trigger setting when is operating in CMV mode.
When the patient produces a negative pressure in the upper breathing circuit higher than the trigger level (in absolute value) , the device
will start a new breath.
This ventilation technique is commonly used for patients able to sustain inhalation work for brief intervals. The effort made by the patient
for the spontaneous inspiration creates a negative pressure inside the ventilator. This negative pressure is detected by the trigger