18
mechanism which does begin the insufflation. The effort (negative pressure) needed to activate the trigger can be adjusted and
progressively increased in order to encourage the patient to a higher breathing work, re-educating and training his respiratory muscles.
The adjustment range is form -2 to -12 mbar.
11.4
Ventilation modes
CMV Mode
This mode is selected by default when the unit is turned on. It consist of insufflation of the medical gas to the patient according to the
parameters set with the adjustment knobs.
he inspiratory and expiratory time ratio is constantly 1:2.
This ventilation mode can be manually selected pressing on the button
CMV
placed on the frontal panel. When selected, the CMV led will
turn on.
A/CV Mode
This ventilation mode can be selected by pressing the button
A/CV
placed on the frontal panel. The dedicated led will turn on.
In this ventilation mode, the device provides an assured number of inflations per minute according to the parameters set, operating similarly
as in the CMV mode. Furthermore, thanks to the trigger mechanism, if the patients begins a new breath within the next assured inflation, the
device anticipates the inflation according to the parameters set. Such inflation will be considered as the first of a new theoretical cycle of
assured inflations, unless the patient anticipates further ones. It is therefore fundamental to set a trigger value suitable for patient’s clinical
condition.
This ventilation mode does not provide the activation of the APNEA alarm.
The trend of the inspiratory and expiratory phases is displayed on the LEDs placed on the front panel, making the interpretation of the
patient response easier and allowing better adjustment of parameters.
The ventilation should always begin with the trigger level requiring less effort (-2mbar).
TVM mode
This ventilation mode can be selected by pressing the button
TVM
turning on the dedicated light
.
This ventilation mode is generally suitable for patients having very high breathing autonomy.
Settings of the ventilation parameters should use the same criteria described for the A/CV mode.
The device starts a new breath only if this is triggered by the patient according to the trigger setting. If the patient doesn’t start a
spontaneous breath within 25 second from the end of the previous breath, the device activates the APNEA alarm but it
WILL NOT
SWITCH
to
the controlled ventilation mode.
Air Mix/No Air Mix Selection
The lever placed on the front panel, allow to choose between two available FiO
2
levels.
If in NO AIR MIX mode, the ventilator delivers only the medical gas coming from the main medical gas supply to which the device is
connected. If the supply system delivers oxygen, the ventilator will deliver to the patient an oxygen concentration of 100%. Selecting the AIR
MIX mode, the ventilator draws 60% of gas from the medical gas supply and the remaining 40% from the environment where the device
used. In this case, if the main gas supply deliver oxygen, the concentration of this gas administered to the patient will be of 60%.
It is inappropriate to use the Air Mix mode in case of polluted environment. The device has a filter for incoming air subjected to periodic
replacement as specified in paragraph 12
11.5
Usage
The physician who directs rescue operation is responsible for the choice of the device to be used and for the clinical assessments needed for
the proper use of this device and for the choice of the proper ventilation parameters.
Patient circuits used for the ventilation must be chosen among those approved by the manufacturer. For ventilation of pediatric patients, a
pediatric patient valve must be used.
The residual pressure of the medical gas supply must be regularly checked to ensure enough autonomy. The achievement of low pressure in
the oxygen supply, would result in the shutdown of the device and in the activation of an alarm signal.
The device provides alarms intended to limit risks of wrong adjustments or needed for a safe use of the product. Alarms can be silenced by
pressing the button identified by the symbol
placed on the frontal panel. The audio paused condition can be identified by the
illumination of the LEDs of the write “
MUTE”.
The audio pause function has no effect on lights and alarms that are not active when the mute
button is pressed.
For safety reasons, the alarms are not automatically disabled when the alarm condition no longer exist. To disable the audio paused function
and to terminate all active alarms, press the
ALARM RESET
button.
The device has an internal 12V battery. It’s also present a 9V backup battery needed for the operation of the alarms of the main battery
charge status.
When the external power supply is active, the write
EXT. SOURCE
will light continuously. If connected to the external power supply and the
battery is not fully charged, the charging will automatically start and the write
ON CHARGE
will light. Flashing of the write ON CHARGE,
identifies a particular condition that does not allow to charge the battery. (See par. 11.6).
The pressure in the patient circuit is always shown on the manovacuometer placed on the front panel.
In standard conditions it is suggested to remove any implants, evaluate the need of bronchoaspiration, hyperextend the patient’s head and,
to ensure that the airways are clear, position the face mask over the mouth and nose checking the adherence of the soft part of the mask on
the patient’s face, in order to obtain a sealed system. It is important to verify that the mask is suitable for the patient; in the early stages of
the ventilation it is suggested to force the adhesion of the mask to the patient’s face.
The adjustment method of the volume minute knob (by steps), prevents changes in the set parameters due to accidental contacts.