1. Turn on the power supply, turn on the switch, check the performance of the aspirator and adjust the negative pressure.
2. After suction, turn off the suction switch.
3. Put the suction head into a bowl filled with physiological saline and rinse the residual liquid in the suction tube.
4. After that, tighten the regulating valve to make the negative pressure drop below 0.02MPA, turn off the suction switch and clean the liquid storage bottle.
Electric aspirator is a commonly used medical instrument, which can be used to attract secretions, blood and other liquids in patients. Countercurrent device is an important part of electric suction device, which is used to prevent liquid from flowing backwards during suction.