AS3000™ Service Manual 0070-10-0683 1 - 9
Theory of Operation Components
37. Bellows Assembly
The AS3000 employs ascending ventilation bellows, in which mixed gas is stored. Drive
gas supplied by the ventilator forces the bellows to descend sending mixed gas into the
inspiratory passage of patient's airway. If a patient's airway suffers from gas leakage, the
bellows will collapse, informing the operator of a possible problem. A tidal volume scale is
provided on the transparent dome, through which a patient's tidal volume can be estimated.
38. Pressure-relief Valve
The Pressure-relief Valve is located at the base of the bellows. When end-expiration airway
pressure reaches 1 - 3 cmH
2
O, the pressure-relief valve opens and redundant gas is
expelled.
39. Exhaust Gas Outlet
The Exhaust Gas Outlet is located on the lower part of the Breathing System. It is connected
to the AGSS or via the AGSS transfer tube.
40. Absorber Heating System
The Breathing System is heated to body temperature to avoid humidified gases condensing
within the Breathing System thus improving airway climatization for the patient's re-breathing
of respiratory gases.
1.3.5 Breathing System
The Breathing System is integrated into a compact aluminum block. This block is heated to
body temperature to prevent condensing of humidified gases within the Breathing System,
thus improving airway climatization for the patient's re-breathing of respiratory gases. The
heated Breathing System contains: an inspiratory valve with O
2
adapter for FiO
2
measurement, expiratory valve, APL Valve, breathing bag connection, and internal
inspiratory and expiratory flow sensors.
1.3.6 The Ventilator Unit
The AS3000 ventilator offers multiple ventilation modes: Controlled Mandatory Ventilation
with volume control (CMV), Pressure Control Ventilation (PCV), Synchronized Intermittent
Mandatory Ventilation (SIMV), and Pressure Support (PS) ventilation. Electronic PEEP is
available in all ventilation modes. User control over inspiratory flow (SLOPE) is possible in
PCV, SIMV, and PS modes. Automatic fresh gas compensation limits the effect of user
changes in fresh gas flow rate on the patient. The traditional bellows system is driven by
oxygen and makes patient disconnections clearly visible.
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