The sphygmomanometer can effectively measure blood pressure, for some people who have high blood pressure themselves is very effective, some people will always have a sphygmomanometer inside the home, so as to avoid some problems with blood pressure, a lot of people do not understand why the sphygmomanometer can be effective in measuring blood pressure, the next step is to analyze the principle of sphygmomanometer.
Electronic blood pressure monitor principle
Measurement of blood pressure for the elderly is quite important, the elderly are prone to high blood pressure, some of them use an electronic blood pressure monitor, so what is the principle of electronic blood pressure monitor?
Electronic sphygmomanometer is the use of modern electronic technology and blood pressure indirect measurement principle for blood pressure measurement of medical equipment. Electronic sphygmomanometer principle using the oscillometric method, which should be accurate in principle.
The electronic sphygmomanometer made by the principle of the auscultation method, although the realization of automatic detection, but still has not completely solved its inherent shortcomings, that is, the error is large, poor reproducibility, susceptible to noise interference. The vast majority of blood pressure monitors and automatic electronic sphygmomanometers use the oscillometric method to measure blood pressure indirectly.
Principle of mercury sphygmomanometer
There are many ways to measure blood pressure, the main thing is to measure accurately, and some people think that mercury sphygmomanometer measurement is very accurate.
Mercury sphygmomanometer measurement is mainly through the inflatable cuff, with a stethoscope to listen to the Koch sound method of pressure measurement, the height of the mercury column indicates the pressure within the cuff, cuff pressure can be transmitted to the arterial wall, to the cuff pressurized until the arterial wall can be made to close, when the cuff pressure is just equal to the systolic pressure, the blood vessels were opened, the stethoscope can be heard Koch sound, the cuff pressure at this time is systolic pressure, the cuff pressure continues to fall, until just below the diastolic pressure, the cuff pressure continues to fall, until just below the diastolic pressure. The cuff pressure continues to fall until it is just below the diastolic pressure when the Koch sound disappears, so that the diastolic pressure is also measured.
Different sphygmomanometers are suitable for people and not suitable for people, mercury sphygmomanometer is generally not suitable for patients with poor hearing or immobile auscultation.
Principle of the mercury sphygmomanometer
The mercury sphygmomanometer is not used by everyone, but some people who have used it may feel that it is more accurate.
In the use of mercury column sphygmomanometer first wear a good stethoscope close to the inner elbow socket at the brachial artery. The other hand to close the valve on the screw cap, holding the balloon to the cuff inflated to the brachial artery beat sound disappeared and then rise 20 ~ 30 mm Hg, and then slowly release the valve, so that the mercury column slowly down, and pay attention to the scale of the mercury column pointed out.
When the first beat is heard in the stethoscope, the scale indicated by the mercury column is the systolic blood pressure. When the beat suddenly weakens or disappears, the scale indicated by the mercury column is the diastolic blood pressure. This is the principle of the mercury column sphygmomanometer.
How a regular sphygmomanometer works
Most people buy a sphygmomanometer when they buy a more conventional one, which is generally more commonly available, so what is the principle of a regular sphygmomanometer?
The main principle of the sphygmomanometer is the process by which air is pressurized to compress local arteries, and by applying pressure to stop local arteries from pulsating, thus measuring the pressure of blood flow during this period .
Note that during the measurement of blood pressure, the sound heard with the stethoscope is not the business of the heart beating, but the sound made by the formation of vortices as the blood flows through the narrowed blood vessels, and therefore the value of blood pressure is measured at this time.