Datascope - Mindray
Datascope - Mindray
Datascope - Mindray
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Ventilator Pneumatic - O 2 Drive Gas Theory of Operation<br />
1.8 Ventilator Pneumatic - O 2 Drive Gas<br />
1.8.1 Ventilator pneumatic drive<br />
Oxygen is the driving gas for the ventilator. In addition to the flowmeter block, a high<br />
pressure regulator reduces the supply pressure to 25.4 psi (175 kPa). This pressure<br />
represents the drive gas for the ventilator.<br />
The drive pressure regulator is placed ahead of the proportional valve that generates the<br />
driving gas flow during the inspiratory phase. This flow fills the bellows dome that surrounds<br />
the bellows.<br />
1.8.2 Drive Pressure-High pressure regulator<br />
The drive pressure regulator stabilizes the supply pressure provided to the proportional valve.<br />
The flow generated by the proportional valve is therefore independent of pressure variations<br />
at the supply.<br />
Setting the drive pressure regulator at 25.4 psi (175 kPa) allows for a maximum inspiratory<br />
flow of 70 L/min at the ventilator.<br />
1.8.3 Gas Box Assembly<br />
The driving module consists of the proportional valve and a solenoid valve for the vent mode<br />
switch. The proportional valve pressure regulator, and generates a driving gas flow of 0 - 70<br />
L/min in relation to the control voltage of the proportional valve of 0 - 5VDC.<br />
The control voltage of the proportional valve, required for the pre-selected parameter<br />
settings, is generated by the BDU board. The driving gas flow Qdrive gas is in the following<br />
relationship with the tidal volume:<br />
Q drive gas = V T/T<br />
with: Q drive gas = driving gas flow<br />
V T = generated tidal volume<br />
T = time<br />
1.8.4 Tube color coding<br />
All the pneumatic tubes used in the AS3000 are color coded for use in the United States<br />
only.<br />
GAS US STANDARD<br />
O2 Green<br />
N2O Blue<br />
AIR Yellow<br />
1 - 36 0070-10-0683 AS3000 Service Manual
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