The measurement principle of the electronic sphygmomanometer is to automatically adjust the inflation volume of the cuff tied to the upper arm to change the pressure. When the blood passes through the blood vessel, there is a certain oscillation wave, which is received by the pressure sensor, and gradually deflates with the change of the oscillation wave. The pressure and fluctuation detected by the pressure sensor also change accordingly. Select the moment of maximum fluctuation as the reference point. On this basis, the fluctuation point of a certain value is regarded as systolic blood pressure forward, and the fluctuation point of a certain value is regarded as diastolic blood pressure backward. Different manufacturers have different settings for this value.

What are the classifications of sphygmomanometer?

1. Mercury sphygmomanometer

Mercury sphygmomanometer is a professional sphygmomanometer. There are two types of mercury sphygmomanometer: desktop sphygmomanometer and vertical sphygmomanometer. Although the price of this kind of sphygmomanometer is relatively low, it is very easy to cause mercury column rupture and mercury leakage, which is dangerous. It is not recommended for home use, and it also needs to use a stethoscope.

2. Electronic sphygmomanometer

Electronic sphygmomanometer is a popular sphygmomanometer in the market, which is very popular at home. According to the actual measurement position, it can be subdivided into upper arm type, wrist type, finger type, manual type, automatic type, etc. Its advantage is that the operation method is simple, the reading is intuitive, and automatic control of the measurement can be achieved by simply opening a switch, making it suitable for use in families.

3. Barometer sphygmomanometer

Barometer type sphygmomanometer uses a pneumatic pump to measure pressure. It is small in size and easy to carry. However, with the increase of use times, the change of spring characteristics will affect the accuracy of measurement results. Therefore, it is necessary to calibrate the standard mercury column sphygmomanometer on a regular basis, and the clinical application is also rare. The barometer type sphygmomanometer is not suitable for the elderly with weak eyesight and hearing.

How to buy electronic sphygmomanometer

1. Visual inspection

Make sure to choose a good brand of sphygmomanometer, and its product manual should include the production and operation license number and detailed instructions on the correct use of related products. If you do not understand the correct use of the product, it can also affect the accuracy of the measurement results. The metrology law of our country explicitly stipulates that "work measuring instruments used for medical environmental hygiene shall be subject to compulsory verification". Sphygmomanometer is listed as a measuring instrument managed according to law in our country. The sphygmomanometer produced by the manufacturer shall be marked at a prominent position, which mainly includes the name, model, measurement upper limit, manufacturer name and delivery date, and shall also be marked with the standard document number and type approval document number.

2. Accuracy check

The error range of sphygmomanometer is generally 2 ー 3 mmHg. If you want to choose an electronic blood pressure meter, you may as well follow the instructions. You can repeat the test several times to see if the repeatability is good, and you can compare it with the value measured by the mercury sphygmomanometer. When measuring blood pressure, check if the displayed numbers are missing.

3. Price comparison

The price of sphygmomanometer is not the more expensive the better. The price of sphygmomanometer has little to do with quality, but is related to additional service functions. For example, the price of sphygmomanometer with transmission function will be more expensive; Of course, the service life will vary greatly depending on the price. However, families can use it infrequently and do not need to buy expensive and high-end medical sphygmomanometer.

4. Different people have different choices

Different people should choose to travel frequently according to their personal conditions. It is recommended to carry a more convenient electronic sphygmomanometer with your wrist, which can be used for business travel and business trips. However, wrist and finger electronic sphygmomanometer are not suitable for patients with severe vascular sclerosis or calcification. For patients with diabetes, hyperlipidemia and hypertension, upper arm electronic sphygmomanometer can be used more accurately. Barometer sphygmomanometer has been rarely used clinically, so it is not recommended to buy it. Mercury sphygmomanometer is difficult to maintain and can be purchased as required.