1. The working principle of the stethoscope
The principle of the stethoscope is that the vibration between substances is transmitted to the aluminum film in the stethoscope, changing the frequency and wavelength of the sound, reaching the human ear The “comfortable” range, while blocking other sounds, “hears” more clearly. The reason why people hear sound is that the so-called “sound” is the mutual vibration conduction between substances, such as the air vibration of the eardrum in the human ear, etc., which is converted into brain currents, and people hear the sound. Among them, the vibration frequency that the human ear can perceive is 20-20,000 Hz.
Second, the use of the stethoscope
1. The correct way to wear the stethoscope
Stethoscope design Patented ergonomic ear tubes and sinuses that fit the angle of the ear canal. It fits comfortably in the listener’s ear canal without fatigue and discomfort. Before putting the ear tube on, please pull the ear tube of the stethoscope outward; the metal ear tube should be tilted forward, and the ear tube should be inserted into your external ear canal so that the ear canal is tightly closed with your ear canal; the size of each person’s ear canal All are different, you can choose the appropriate size of the ear sinus. If the wearing method is correct, but the tightness of the ear sinus and the ear canal is not good, and the auscultation effect is not good, please pull the ear tube outward to adjust its elasticity. Improper wearing method will result in poor auscultation effect when the ear sinus and the ear canal do not fit tightly. For example, when the ear tube is worn backwards, it will be completely inaudible.
2. Remove debris
If the stethoscope has been left in a pocket or not maintained regularly, lint, fibers or dust from clothing may block the stethoscope ear tube. Regular maintenance and cleaning can prevent this from happening.
3. Check the airtightness
The high-quality sound transmission effect of the stethoscope and the closeness between the stethoscope and the patient’s body surface, and the stethoscope and the ear canal of the listener related. The looseness of the earpiece parts, the looseness of the Y tube, and the damage of the Y tube will affect the tightness. The better the fit, the more accurately the sound from the patient’s body can be delivered to the listener’s ear. So always check the stethoscope status.
4. Double-sided stethoscope
When using a double-sided stethoscope, the user needs to switch the clock face or membrane mode of the stethoscope to use . When the membrane face is in use, the clock face will be turned off to avoid interference. vice versa.
