Alarm Complements
§ Silence 30/60 seconds
It suspends the audible signal of some alarms. It does not suspend the sound of the
power loss and technical alarms.
§ Reset
It is a key with multiple functions, used alone or in combination with other keys. It
reestablishes or aborts changes of not accepted values.
Safety Mechanisms
The ventilator’s safety mechanisms comprise the devices that constitute it and the operative
system that governs the microprocessor. Their function is to preserve the integrity of the
procedure, making it safe and reliable.
Ventilator Components
Safety valve: It is located at the beginning of the breathing circuit. It is factory preset.
It is opened when the pressure within the patient’s circuit reaches, for any reason,
120 cm H
2
O. The gas enters into an internal gas collector and is expelled to the
outside.
Electronic circuit: When the microprocessors detect any failure in the electronic
circuit, not only are the alarm for technical failure activated but also the ventilator
enters into inoperative mode and all solenoid valves are deactivated.
Inspiratory relief valve (antiasphyxia): Located at the beginning of the breathing
circuit. It is opened when there is a power failure or an inoperative state, thus
enabling the aspiration of ambient air.
Operation gases exhaust: The operation gases that normally escape from some of
the internal mechanisms are directed to a common collector from where they are
expelled to the outside.
Low supply pressure of the compressed air: The lack of pressure of the
compressed air (command gas) is compensated by the compressed oxygen through
a connecting valve. The corresponding alarm is triggered, through another device, by
the lack of pressure.
Low supply pressure of the compressed oxygen: The lack of pressure of the
oxygen is compensated by the compressed air. The corresponding alarm is triggered,
through another device, by the lack of pressure.
Monitoring of the airway pressure: There are two pressure transducers located one
at the beginning (proximal pressure) and the other at the end of the patient’s service
circuit (distal pressure).
The proximal transducer commands the pressure in the Pressure-Controlled (PCV)
and Pressure Support (PSV) Modes, the limits of the maximum and minimum airway
pressure, and the positive end expiratory pressure (PEEP). It also originates the
values for the Peak, Plateau, Mean and Baseline Airway Pressure. The distal
transducer is involved in the plotting of the pressure waveforms.
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