Safety checks must be performed before each use of the anesthesia machine!
* Air source inspection:
1) Emergency ventilation device: Confirmed that there is a good simple ventilation device
2) High pressure system:
1 Open cylinder valve
2 Confirm that there is at least a half cylinder of oxygen
3 Close the oxygen cylinder valve
3) Check the center gas supply system: Connect properly, pressure is 3~4kPa
* Low pressure system leak test:
1) Shoe polish in low pressure system can cause patient hypoxia or anesthesia
2) Mainly check the integrity between the flow control valve and the common output port
3) The glass tube and evaporator of the flowmeter and its junction are common parts of the leak
4) Check valves are not available in low-pressure systems. The leak test method is different
* Flowmeter check:
1) Open all gas flows to full scale and observe buoy activity and damage
2) Deliberately adjust the N2O/O2 hypoxia mixture to observe the flow rate change and the alarm system is normal
* Oxygen concentration correction:
1) Perform 21% oxygen air correction
2) Oxygen sensor access loop, rapid oxygenation
3) Confirmed oxygen concentration monitoring > 90%
* Breathing circuit leakage (valve):
1) Close all air flow and APL valves and block Y connector
2) Rapid oxygenation, loop pressure increased to 30cmH2O
3) Confirm that the pressure is maintained for more than 10s
* Residual gas clear system:
1) Verify that the exhaust system of the sewer system is connected properly
2) Open APL valve, block Y connector
3) Reduce oxygen flow, the pressure in the loop system is 0
* Monitor calibration, etc.
Positive pressure test:
I. Close the exhaust valve
II. Oxygenation to make the circuit pressure reach 3~5Kpa
III. Observe whether the gauge pressure can be maintained within 30 seconds or longer
IV. Simple operation and poor sensitivity
V. often can not detect leakage less than 250ml/min
Negative pressure test:
Negative pressure test for anesthesia machines with check valves or without check valves
Close all flow control valves
I. Pinch the ball to the common outlet
II. The ball forms a negative pressure in the low pressure system to open the check valve
III. The ball maintains atrophy for more than 30 s
IV. If the ball bulges within 30s, it indicates the presence of a leak
V then turns on the evaporator density knob one by one
VI. Check Evaporator Leakage
VII. Very sensitive, can detect the presence of leakage of 30ml/min
Check anesthesia ventilator and check valve:
1) Y is connected to the simulated lung and the corresponding respiratory parameters are set
2) Minimize oxygen flow and shut off other air streams
3) Start mechanical ventilation, rapid oxygenation to make the bellows fill
4) The official expiratory phase output VT is correct. Exhalation bellows filling
5) Formal one-way valve and breathe back all components are working properly
6) Switch to manual breathing, formally simulate pulmonary dilation, normal resistance
7) Remove the Y connector
* Check monitoring device:
Check the calibration of all monitors and their alarm limits
* Check the final state of the anesthesia machine:
1) APL valve is open and the evaporator is closed
2) Respiration mode placed in manual mode
3) All flow meters are at 0 or up to the minimum
4) It is certainly attractive enough to attract the patient's secretions
5) Ventilator out of standby
