What do you Need to Know About Stethoscopes?

As a Personal Protective Use Disposable Mask Factory, share it with you.

Auscultation head size

The larger the contact surface between the auscultation head and the body, the better the sound effect picked up. However, the surface of the human body has a curvature. If the chest piece is too large, the ear can not be in full contact with the human body. The sound will not only not be picked up well, but also leak out from the gap. Therefore, the size of the auscultation head should be based on clinical needs. The diameter of the stethoscope chest piece is almost uniform between 45-50 mm. The diameter of special chest pieces such as pediatrics is generally 30 mm, and the diameter of newborns is 18 mm.

Precordial Stethoscope

The material of the stethoscope

Material plays an important role in sound effects. Sound is transmitted through air or matter, and finally converted into heat and disappears. The transmission of sound waves has almost no attenuation in heavy metals, and is prone to attenuation in lighter metals or plastics. Therefore, high-grade stethoscopes must use heavy metals such as stainless steel or titanium.

The conductive part of the stethoscope

The sound transmission line is also very important. The larger the inner diameter of the pipeline, the shorter the length, and the thicker the tube wall, the better the effect of the stethoscope. The international standard length is 27 inches. The sound transmission pipeline of modern stethoscopes is generally made of PVC, which has good sound effect and beautiful appearance, but it has poor stretch resistance and is often bent and easily broken after stretching. The stethoscope should be hung flat on both sides of the neck after use. This can be seen in foreign TV dramas and is the standard way to wear a high-quality stethoscope.

Clinical Application of stethoscope

During cardiac auscultation, the membrane earpiece can listen to high-frequency sounds well, and the cup-type earpiece is suitable for listening to low-frequency sounds or noise. Modern stethoscopes are all double-sided stethoscopes. There are both membrane type and cup type on the auscultation head. The conversion between the two only needs to be rotated by 180°. Experts recommend that clinical doctors use double-sided stethoscopes. There is also a patented technology called floating membrane technology. The membrane type auscultation head can be changed into a cup type head in a special way to hear low frequency noise. Both normal and abnormal lung sounds are high-frequency sounds, and only a membrane ear can be used for lung auscultation.

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