The aneroid sphygmomanometer is a device used to measure blood pressure. It is also referred to as a manual blood pressure cuff or stethoscope. This device is typically made up of an inflatable cuff, a hand-held pump, and a manometer. Since the aneroid sphygmomanometer is such an important medical tool, it's essential to understand both its principles and the safety precautions associated with it. In this article, we will discuss both of these topics in detail so that you can gain a better understanding of this crucial piece of equipment.
Principle of medical aneroid sphygmomanometer
The working principle of aneroid sphygmomanometer is based on the law of mercury column pressure in a manometer. The aneroid sphygmomanometer consists of an inflatable cuff, a mercury manometer, and a rubber bulb. The cuff is wrapped around the upper arm and inflated with the rubber bulb to compress the brachial artery. The mercury column in the mercury manometer rises with the increase of cuff pressure. When the mercury column reaches the level of atmospheric pressure, it stops rising. This is the systolic blood pressure. With further increase in cuff pressure, the mercury column starts to fall when the brachial artery is completely compressed and can no longer pulsate. This is diastolic blood pressure. By reading the height of the mercury column at this time, you can know your blood pressure.
Precautions for using aneroid sphygmomanometers:
1) The aneroid sphygmomanometer should be placed on a firm and level surface before use;
2) The air release valve should be open before inflating the cuff;
3) Inflate the cuff quickly to about 30mmHg above your expected systolic blood pressure reading;
4) Deflate the cuff at a rate of 2-3mmHg per second until you can hear faint sounds again;
5) Read your systolic and diastolic blood pressures.
Precautions of medical aneroid sphygmomanometer
If the aneroid sphygmomanometer is not used properly, it may give false readings. For this reason, it is important to follow the instructions carefully when using this device.
Some of the things that you need to keep in mind when using an aneroid sphygmomanometer include:
- Always check the air pressure before use. If the pressure is too low, it can give false readings.
- Make sure that the cuff is placed correctly on the arm. If it is not placed correctly, it can give false readings.
- Do not use an aneroid sphygmomanometer if you are pregnant or have heart disease. This can lead to inaccurate readings.
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