2 Theory of Operation
2-2
05/04 1006-0453-000
2.1 General description
The Aestiva 7900 Ventilator is a microprocessor based, electronically-
controlled, pneumatically-driven ventilator with built in monitoring systems
for inspired oxygen, airway pressure and exhaled volume. The ventilator is
designed to be used as a medical device assisting in the delivery of
anesthesia and is part of the Aestiva Anesthesia Machine.
2.2 Aestiva 7900 Ventilator features
• Sensors in the breathing circuit are used to control and monitor patient
ventilation and measure inspired oxygen concentration. This lets the
ventilator compensate for compression losses, fresh gas contribution, valve
and regulator drift and small leakages in the breathing absorber, bellows
and system.
• Positive End Expiratory Pressure (PEEP) is regulated electronically. During
mechanical ventilation the software maintains the set airway pressure. PEEP
is not active when mechanical ventilation is off.
• User settings and microprocessor calculations control breathing patterns.
User interface settings are kept in non-volatile memory.
• Mechanical ventilation is started with the Bag/Vent switch on the breathing
system.
• The Aestiva 7900 Ventilator reads the status of the Bag/Vent switch and the
breathing circuit type (Circle, Bain-Mapleson D). The operator does not have
to set the breathing circuit type from a menu.
• The Aestiva 7900 Ventilator has an operator-selectable Heliox mode to
permit gas composition compensation when Heliox gas is used.
• All Aestiva 7900 Ventilators have minimum monitoring and alarms
managed on the ventilator panel (there is no other panel for safety
relevant alarm management, etc.).
• Ventilator hardware is regularly monitored by software tests.
• An RS-232 serial digital communications port connects to and
communicates with external devices.
• An exhalation valve modulates flow in the pressure mode.
• Pressure and volume modes are selectable by the operator.
• All pneumatic components are located on one manifold.
• Exhausted drive gas and bellows pressure relief valve gases are mixed and
go through the ventilator exhalation valve.
• Exhalation valve block is autoclavable.
• Excess fresh gas released from the bellows and ventilator drive gas is
transferred from the exhalation valve to the Anesthesia Gas Scavenging
System (AGSS).
• Optimized for service with a low number of components.
Summary of Contents for Aestiva 7900 SmartVent
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