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5.5 Using the rebreathing circuit and non-rebreathing circuit
It is recommended that when the animal weighs less than 7kg, the non-rebreathing circuit that can
be used to supply the animal with anesthetic gas. At this time, the exhaled gas is no longer passed
through the CO2 absorbent canister, but be directly exhausted into the gas filter canister or
outdoor.
It is recommended that when the animal weighs more than 7 kg, a rebreathing circuit can be used
to supply the animal with anesthetic gas.
5.6 Adjusting the highest pressure in system
1)
Turn the relief valve counterclockwise to completely open, make sure the needle of pressure
gauge has dropped down to zero;
2)
Remove the breathing bag, and connect the exhaled port of rebreathing circuit to breathing
bag mount;
3)
Turn on the oxygen flowmeter control valve, increase the flow rate up to 1 L/min. The
system pressure will increase with oxygen flowed into system.
4)
Turn the relief valve clockwise to increase system pressure, and pay attention to the needle of
pressure gauge. Stop rotating until it reaches appropriate pressure, which is recommended not
to be over 20 cmH2O;
5)
Turn off the flowmeter, and reconnect the breathing bag and rebreathing circuit.
5.7 Post-anesthesia procedure
Once the anesthesia procedure is completed, perform the following steps in order:
1)
Turn off the vaporizer by turning the volume-percent dial clockwise to zero (
0
).
2)
Remove breathing circuit from endotracheal tube or mask, and put the connector onto the
plug on the main support of anesthesia system.
3)
Press the oxygen flush button for 2-3 seconds and squeeze the breathing bag to purge the
system of anesthetic gas and carbon dioxide.
4)
Cut off the oxygen supply source.
5)
Open the relief valve by turning it counterclockwise.
6)
Record the used time of absorbent in the CO
2
absorbent canister. If the total time is over 10 h,
change the absorbent as described in
Section 4 – System Setup
.
7)
If the system will be vacant for a long time, drain the anesthetic agent inside the vaporizer as
described in
Section 7 – Maintenance
.
8)
Thoroughly clean the anesthesia system as described in
Section 7 – Maintenance
.
Use caution on the pressure gauge while using to avoid
overpressure.