What are the classification and characteristics of sphygmomanometers?

The mercury (mercury) sphygmomanometer is durable, stable and accurate in measuring blood pressure; it is completely dependent on human subjectivity, has poor repeatability, and its accuracy depends on the experience of clinicians. External noise interferes with the identification of “Korotkoff sounds”, which is inconvenient to carry.

The electronic sphygmomanometer does not need to master Korotkoff sound auscultation, it is small and light, easy to use, easy to master, low noise, no mercury leakage, suitable for home self-test or measurement on business trips. It has high sensitivity and poor anti-interference, and is easily affected by factors such as the subject’s body position, upper arm position, and cuff wrapping position.

The barometer type sphygmomanometer is small in size, has no liquid, is easy to carry, and has no mercury leakage problem, but it is difficult to ensure that the pressure measurement data is always accurate. It must be regularly calibrated with the mercury sphygmomanometer, and the reading is usually low.