The mercury sphygmomanometer is a common medical device, which plays a very important role in measuring blood pressure and ensuring human health. Because of its frequent use, poor maintenance, and easy failure. The mercury sphygmomanometer has bubbles or intermittent phenomena in the mercury column, which is mainly caused by insufficient mercury in the mercury storage bottle. In addition, the mercury oxide is attached to the inner wall of the mercury storage bottle to make the effective volume smaller and the mercury storage The mercury in the bottle does not reach the required amount, dirt on the inner wall of the graduated glass tube, and air in the mercury column are also important reasons for the mercury column to bubble or intermittently. It can be solved by increasing the amount of mercury to zero, cleaning the mercury storage bottle or graduated glass tube, and repeatedly pressing and removing air.
