Heyer iTernIS ADV, Operator'S Manual

Page: 201 / 218

Technical specifications | iTernIS ADV
17. 11
of the patient circuit (expiratory set) or optionally at the connection to the patient for
the NEO-INF category (on the proximal pneumotachograph). The signal from this
transducer is also used to trigger inspirations when activating pressure detection,
breath cycling, alarm levels, among others. Proximal pressure is measured with a
transducer near the outlet to the patient. The most important task of this element is
pressure control in pressure-controlled mode breathing or with support pressure.
Flow information is obtained by two differential pressure transducers connected
to the output internal pneumotachograph and the expiratory pneumotachographs
(distal or proximal). The internal pneumotachograph (Silverman mesh type) allows
controlling the flow and volume driven by the ventilator in the inspiratory phase.
Expired flows are measured through the expiratory pneumotachographs (distal and
optionally proximal).
The equipment has a valve system that provides a communication channel between
the pressure transducers and ambient pressure. This will allow zeroing the transdu-
cers. Simultaneously, air flow is driven to purge the lines of the expiratory pneumota -
chograph, and avoid water deposits and humidity in the measuring element.
iTernIS ADV
has a complete safety system, which includes the operating system
that controls the microprocessor, and various components that act independently
of these.
• WATCHDOG: this is a system that monitors the operation of the electronic circuit,
and exerts its control regardless of the integrity of the latter. When it detects an
anomaly in the ventilator function, it allows it to suspend, and enables the Emer-
gency Ventilation mode.
Watchdog can activate Emergency Ventilation in two different situations:
- After 30 s elapsed from turning on the ventilator, without selecting a patient cate-
gory on the first screen of initial calibration.
- When the microprocessor loses control of the sequence that regulates the venti-
lation program.
• EMERGENCY VENTILATION: Emergency Ventilation is a safety mechanism that
is activated in conditions of extreme necessity to provide temporary ventilation to
the patient until measures are taken to replace the ventilator with an alternative
ventilatory mechanism. This is not a valid operating mode.
Emergency Ventilation enables the delivery of breaths with similar characteristics
to those of the pressure controlled (PCV ). During the course of this event, only
peak pressure and respiratory rate are monitored. The preset values for ventila-
tory parameters are shown in Table 17-15. The alarm limits are not enabled for
changes. Active alarms are for Maximum and Minimum pressure, and Maximum
respiratory rate, whose limits are shown on screen. The only additional enabled
function is Manual Insp.
17.13 | Safety Mechanisms