How to detect and handle pressure leakage in sphygmomanometers

Pressure leakage is one of the important factors affecting the measurement accuracy and service life of medical sphygmomanometers. Pressure leakage not only causes distortion of measurement data, but may also affect the continuity and safety of blood pressure monitoring. Accurate detection and effective handling of pressure leakage are key links to ensure the stability of sphygmomanometer performance and user experience.

Definition and impact of pressure leakage
Pressure leakage refers to the phenomenon that the air pressure in the sphygmomanometer system fails to remain stable after inflation, and the air pressure drops. Leakage causes pressure fluctuations during the measurement process, affecting the accuracy of blood pressure readings, and even making the measurement impossible to complete. Leakage also accelerates the wear of the airbag and pipeline, increases maintenance costs, and shortens the service life of the instrument.

Common sources of pressure leakage
The airbag interface is not tight, which is one of the main sources of leakage. Poor sealing and aging cracking at the connecting pipe joints can cause gas to escape. Fatigue, tiny perforations or gaps in the airbag material itself can also cause leakage. Poor mechanical sealing of valves and inflators, especially aging of release valves, are prone to leakage. In addition, bending and damage of the internal pipelines of the sphygmomanometer are also potential leakage points.

Detection method of pressure leakage
Static pressure retention test
After inflating to the preset pressure, close the inflation valve, keep it for a period of time (such as 1 minute), and observe whether the pressure gauge pointer or digital pressure value drops. Stable pressure indicates no obvious leakage, and a rapid drop in pressure indicates a leakage problem.
Leakage sound detection method
Use ultrasonic detection instruments to detect high-frequency sound waves generated when gas leaks. This method is suitable for locating small leaks and can quickly and accurately find the leak point of the airbag or pipeline.
Bubble method
Part of the inflation system is immersed in water, and the leak location is determined by the bubble emergence. This method is simple to operate, but it is only suitable for laboratory environments or maintenance.
Automated electronic detection
High-end electronic sphygmomanometers are equipped with pressure sensors and automatic monitoring systems to monitor inflation pressure changes in real time. The system can analyze pressure fluctuations through intelligent algorithms, automatically alarm to indicate leakage risks, and improve maintenance efficiency.

Pressure leakage processing technology
Replacement of seals
Replace aging and worn seals, interface gaskets and inflation valve seals in time to restore sealing performance. Use high-quality sealing materials to improve durability and sealing effect.
Airbag repair and replacement
Use professional leak-proof materials to repair slightly perforated airbags. It is recommended to replace the airbag in case of severe damage to ensure pressure retention performance and measurement safety.
Pipeline maintenance
Regularly check the bending, damage and loose interface of the connecting pipe, and replace or re-fix it. Use wear-resistant and anti-aging pipes to extend the service life.
Valve maintenance
Clean and lubricate the release valve and inflation valve to prevent mechanical jamming and seal failure. Replace valve components when necessary.