Mindray WATO EX-65, Operator'S Manual

Page: 219 / 276

A-3
A.1.3 Description
Gas supplies
The anesthesia machine has pipeline and cylinder gas supplies available. Pipeline gas
supplies, O
2
, N
2
O and Air, go into the system through pipeline connectors 1, 3 and 4
respectively. The pipeline pressure ranges between 280 and 600 kPa. Cylinder gas supplies,
O
2
and N
2
O, go into the system through cylinder connectors 2 and 5 respectively. The O2
and N2O cylinder pressures are 6.9 to15 MPa and 4.2 to 6 MPa respectively, which is
decreased to 300 to 500 kPa through regulator 6.Every connector is clearly marked to
prevent erroneous gas connection. All connectors have filters and check valves. Color coded
gauges show the pipeline and cylinder pressures. Pressure relief valve 7 functions to prevent
too high supply pressure.
Fresh gas
When system switch 22 is opened, flowmeter 26 is connected to the gas supplies. Regulator
24 decreases the gas pressure to 200 kPa to ensure constant pressure supplied for the
flowmeter. Pressure switch 23 monitors the O
2
supply pressure. If the O
2
supply pressure is
lower than 220 kPa, an alarm appears on the ventilator display. If the O
2
supply pressure is
lower than 100 kPa, N
2
O is cut off automatically through the O
2
-N
2
O cut-off valve, which
does not impact Air supply. The flowmeter is equipped with O
2
-N
2
O chain linkage, which
keeps the O
2
concentration not lower than 25% at the fresh gas outlet. The mixed gas of O
2,
Air and N
2
O goes from the flowmeter outlet through the vaporizer 29 that is ON, and
carries some amount of anesthetic agent to form fresh gas. The fresh gas goes from check
valve 30 to ACGO selector switch 32. When the ACGO selector switch is opened,
mechanical ventilation stops. The fresh gas is delivered directly through the breathing
system inlet and mechanical pressure relief valve 54 prevents pressure too high in ACGO
On status.When the ACGO selector switch is closed, the fresh gas is delivered to the
breathing system to be used by the patient during mechanical ventilation. The O
2
output
from the O
2
flush button 19 directly goes to the breathing system without going through the
flowmeter assembly and vaporizer.
Anesthetic ventilator
This anesthetic ventilator is a pneumatically driven, microprocessor-controlled anesthesia
delivery system. The drive gas comes from O
2
or AIR gas supply. Filter 8 filters the drive
gas again. Regulator 9 helps keep the drive gas pressure to stay within a fixed pressure
range. Pressure switch monitors the drive gas pressure. If the drive gas pressure is lower
than the preset pressure limit, an alarm appears on the ventilator display. Inspiratory flow
control valve 10 controls the inspiratory flow. The proportional PEEP valve 16 monitors the
opening and closing of expiratory valve 17 and produces PEEP as well. During inspiration,