Mercury
blood pressure monitor. There are two types: desktop and vertical. The desktop mercury blood pressure monitor has reasonable structure, firm and reliable; The vertical blood pressure monitor can adjust the height arbitrarily, which is most commonly used because of its reliable results. However, the latter is slightly larger, inconvenient to carry, and has the risk of mercury leakage. The principle of measuring blood pressure is auscultation, which is mainly composed of balloon, cuff and manometer. The two tubes of the rubber bag of the cuff are respectively connected with the balloon and the pressure gauge, and the three form a closed pipeline system. There are two types of pressure gauges: mercury column type and spring type
Electronic
blood pressure monitor. According to the measured position, it can be subdivided into upper arm type, wrist type, finger type, manual type, automatic type, etc. The utility model has the advantages of simple operation and intuitive reading. It can be measured automatically just by opening the switch, which is suitable for family use. However, the electronic blood pressure monitor also has the disadvantage of large error, which also needs to be calibrated based on the standard mercury blood pressure monitor. Its principle is auscultation (also known as Coriolis sound method) or oscillography (also known as oscillation method). It is mainly composed of gas pressure sensor, pressurized micro air pump, electronically controlled exhaust valve, relevant software, mechanical slow exhaust valve and solenoid fast exhaust valve
Barometer
blood pressure monitor. Clinically, it is also called non liquid blood pressure monitor and spring blood pressure monitor. The use of air pressure pump for pressure measurement has the advantages of small volume and convenient carrying. However, with the increase of application times, the accuracy of the results will be affected due to the change of spring properties. Therefore, it is necessary to calibrate the standard mercury blood pressure monitor regularly, which has been rarely used in clinic
