What is a Sphygmomanometer and How Does it Work ?
The sphygmomanometer is a medical instrument used to measure blood pressure. It consists of a cuff, a bulb, and an inflatable cuff.
The sphygmomanometer was invented by the French physician René Laennec in 1819. In 1831, Laennec invented a simple mechanical device that consisted of an inflatable cuff placed on the arm until it was tight enough to measure the artery pressure in the arm. With this device, he discovered that his blood pressure was consistently high, and did not fall even during sleep. He then devised a rigid cuff made of brass that could be inflated with a hand pump and that was attached to a stethoscope via a long rubber tube. Sphygmomanometer readings can also be taken from the radial artery in the wrist with a plastic cuff. and a stethoscope. The cuff is wrapped around the arm tightly and inflated with the hand pump. The pressure at which it becomes tight is systolic. Once the systolic pressure has been recorded, it deflates and then repeats this process until a diastolic reading or no more air remains in the cuff.

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