Microprocessor-controlled Ventilator Theory of Operation
1 - 2 0070-10-0683 AS3000™ Service Manual
1.2 Microprocessor-controlled Ventilator
The Microprocessor-controlled ventilator, with its dedicated Breathing System, allows time-
controlled, pressure limited, constant volume ventilation for all patient groups within a tidal
volume range of 40 mL (4 kg infant) to 1400 mL (large adult).
Time-controlled, pressure limited, and compliance compensated constant volume ventilation
is provided through the Controlled Mandatory Ventilation (CMV) mode. The CMV mode
delivers a viable ventilation method for complicated lung conditions. The ventilator also
provides time-controlled, volume dependant ventilation, targeting a set (adjustable) target
pressure provided through the Pressure Controlled Ventilation (PCV) mode. Automatic and
comprehensive system startup tests and alarm management systems ensure controlled
ventilation conditions in every mode of operation.
The durable and ergonomically designed user interface and Navigator
™
Knob enables easy
operation. The display provides the selected ventilation modes (CMV, PCV, PS and SIMV)
and the following values: Tidal Volume, Peak Pressure, Mean Pressure, FiO
2
, Breath Rate, I:E
Ratio, PEEP, Plateau Pressure, Alarm limits, and real-time Airway Pressure and flow
waveform.
FIGURE 1-1 The AS3000 Pneumatic System
Gas Inlet
Block
N20
AIR
O2
Breathing
System
Ventilator
Pressure
Switch
Pressure
Regulator
Pressure
Regulator
Pressure
Regulator
Ratio•
Controller
N20•
Cuttoff
Flow
Tubes
Cylinder
Cylinder
Cylinder
Inlet Filter
Inlet Filter
Inlet Filter
O2
Flow
Meter
O2
Outlet
AIR•
Flow
Meter
Patient
Vaporizer
O2
Flush
Pressure
Regulator
Proportional
Valve
Solenoid
Valve
Fresh Gas
PEEP
Valve
Exhaust
Valve
APL Valve
AGSS
Electronic
Control
Reversing
Valve
O2 Sensor
Insp. Valve
Absorber
Canister
Exp. Valve
Breathing Bag
OOO
P
P
P
P
P
P
P
Exp. Flow
Sensor
Insp. Flow
Sensor
Fresh Gas
Flow Sensor
V
Bellows
Vaporizer
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