Mindray Datascope AS 3000, Service Manual

Page: 51 / 180

The Breathing System Theory of Operation
1 - 38 0070-10-0683 AS3000™ Service Manual
1.9.3 Manual mode, inspiration
As the breathing bag is compressed, the gas is directed to the patient. Pressures exceeding
the set value of the APL Valve will pass through the APL Valve the AGSS.
FIGURE 1-30 Breathing System Pneumatics, Manual Mode, Inspiration
1.9.4 Manual mode, expiration
As the patient exhales tidal volume into the expiratory limb, fresh gas enters the Breathing
System. Fresh gas mixes with exhaled gas after the Absorber removes CO
2
. Excess fresh gas
passes through the exhaust valve to the AGSS
FIGURE 1-31 Breathing System Pneumatics, Manual Mode, Expiration
Breathing
System
Ventilator
Patient
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
Br
ea
thi
ng
Ba
g
P
Exp. Flow
Sensor
Insp. Flow
Sensor
Bellows
2 cmH2O
Breathing
System
Ventilator
Patient
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
Br
ea
thi
ng
Ba
g
P
Exp. Flow
Sensor
Insp. Flow
Sensor
Bellows
2 cm H2O