A stethoscope is a medical device used to listen to sounds produced by the body, especially those from the heart and lungs. Most modern stethoscopes are binaural; that is, the instrument is suitable for both ears. The stethoscope consists of two flexible rubber tubes from the valve to the earphones. The valve also connects the tube to the chest piece, which can be a bell to pick up bass, or a flat disc for higher frequencies. The stethoscope is mainly used to detect heart murmurs, irregular heartbeats or abnormal heart sounds. It is also used to listen to the sound of air passing through the lungs in order to detect abnormalities in the air ducts and sacs in the lung wall.
Among them, a sphygmomanometer, also known as a sphygmomanometer, sphygmomanometer or sphygmomanometer, is a device for measuring blood pressure, composed of an inflatable cuff, used to collapse, and then release the artery under a controlled cuff. Way, as well as mercury or mechanical pressure gauge to measure pressure. It is always used in conjunction with a means to determine the pressure at which the blood flow has just begun, and the unobstructed pressure.
