How to deal with bubbles in mercury sphygmomanometer?

When people use the traditional mercury sphygmomanometer, sometimes when measuring blood pressure, mercury bubbles roll up and down in the glass scale tube, which is uncontrollable and forms intermittent mercury knots, which leads to inaccurate blood pressure measurement and affects the measurement.

When mercury comes into contact with oxygen in the air for a long time, it will produce oxides. Careful observation shows that there is a layer of pale silver-gray dirt on the wall of the glass tube with intermittent mercury, which is more obvious at the inner and lower ends of the glass tube. This is a derivative of mercury oxidation, and the mercury "rust" attached to the inner wall of the glass tube is the cause of bubbles.

How to deal with:

1. First, put the mercury in the glass tube of the sphygmomanometer into the mercury tank below the sphygmomanometer for storage. When collecting mercury, pay attention to gently lift the left side of the sphygmomanometer and tilt it to the right, then turn the valve switch of the sphygmomanometer mercury pot to the right to close the mercury pot.

2. Gently push the upper cover of the glass tube with a crew cut screwdriver, carefully take out the glass tube, insert a little absorbent cotton on a cotton swab into the glass tube, push the absorbent cotton with a wool needle or other similar thin rod and carefully wipe it back and forth in the glass tube, then dip the absorbent cotton in a little cleaning solution and insert it into the glass tube once or twice to remove the traces of "rust".

3. Wash the glass tube with tap water to dry it. Wait until the water in the glass tube is naturally dried and volatilized before reinstalling. Intermittent bubbling of mercury in sphygmomanometer will be eliminated.

I hope I can help you!