https://www.youtube.com/shorts/1me-HAB-L98

The portable phlegm suction unit is applicable to suck thick liquid such as pus-blood and phlegm under negative pressure.
– Oil-free piston pump helps to keep from oil mist pollution.
– Plastic panel makes it resistant from water erosion.
– Overflow valve helps to prevent liquid from flowing into pump.
– Negative pressure is adjustable according to requirements.
– Small volume and light weight, easy to carry, especially suitable for emergency and doctors going their rounds outsides.