Blood pressure meter, an instrument that measures blood pressure is called a blood pressure meter. Blood flow was blocked by the pneumatic compression of the measurement site, and then allowed to flow again by emitting gas from the wristband. Blood pressure measurement is determined according to the change of the blood flow sound and vibration issued when the blood flows again.
Classification and its basic construction
R.R. There are desktop and vertical two, desktop mercury sphygmomanometer has a reasonable structure, firm and reliable; vertical sphygmomanometer can adjust the height at will, which is the most commonly used because of its reliable results. But the latter volume is slightly larger, inconvenient to carry, all have the risk of mercury leakage. The principle of measuring blood pressure is auscultation, which mainly consists of three groups: balloon, cuff and sphygmomanometer. The rubber sac of the sleeve is connected to the balloon and the pressure gauge respectively, which form a closed pipe system. Pressure gauge has mercury column type and spring type two kinds.
electronic sphygmomanometer. According to the measurement of the parts can be subdivided into the upper arm type, wrist type, finger type, manual type, automatic type and so on. Its advantage is easy to operate, intuitive reading, just need to open the switch will automatically measure, suitable for home use. However, the electronic sphygmomanometer also has the disadvantage of large error, which often needs to be calibrated according to the standard mercury column sphygmomanometer. The principle is auscultation (also known as Kirscher method) or oscilloscope (also known as oscillation method. It is mainly composed of gas pressure sensor, pressure micro gas pump, electronic control exhaust valve, related software, mechanical slow exhaust valve and solenoid fast exhaust valve.
Barometric-type sphygmomanometer. Clinically, also known as no fluid sphygmomanometer, spring sphygmomanometer. Using pneumatic pump operation for pressure measurement, small volume, easy to carry, but with the increase of the number of applications, the accuracy of the results will be affected due to the change of spring characteristics, so it needs to regularly calibrate with the standard mercury column sphygmomanometer, which has been rarely used clinically.
The main principle of the sphygmomanometer is the process of air pressure and compression on the local artery, thus measuring the blood flow pressure during this period. The measurement principle of sphygmomanometer can be divided into auscultation method and oscilloscope method.
