Stethoscope components are standard
Stethoscope head size
The size of the auscultation head should be based on clinical needs. The diameter of the stethoscope chest is almost uniform between 45-50 mm. Special pediatric chests are usually 30 mm in diameter and 18 mm in newborns.
Materials play an important role in sound effects. High-grade stethoscopes must use heavy metals such as stainless steel or titanium.
Conduction part of the stethoscope
The sound pipeline is also very important. The larger the inner diameter of the tube, the shorter the length, and the thicker the tube wall, the better the stethoscope effect. The international standard length is 27 inches.
Clinical application of auditory head
During cardiac auscultation, the membrane-type head can listen to high-frequency sounds well, and the cup-type head is suitable for listening to low-frequency sounds or murmur. Modern stethoscopes are double-sided stethoscopes. There are both the membrane type and the cup type on the auscultation head. The two can only be rotated by 180°.
Cold proof ring on the head
At the time of the diagnosis, the teacher taught that the stethoscope head should be in the hand for a while before giving the patient auscultation, so as not to stimulate the patient with the cold metal on the stethoscope. The use of the cold proof rings on modern stethoscopes is more humane.
It is important that the earplugs fit well with the ear. Professional stethoscopes are generally equipped with closed earplugs that are excellent in both sealing and comfort.
Stethoscope ear spring
The new type of stethoscope ear springs are made of tough steel, adjustable to the appropriate tightness, comfortable to wear, and easy to adjust the orientation of the earplugs. Since the ear canal is not completely 90° perpendicular to the side, but is slightly inclined rearward, the earplug should be tilted slightly forward when worn. The ear tip of a high quality stethoscope can be pre-fixed in an anatomical direction, called an anatomically correct ear piece.