In 1816, French doctor and anatomist Ray Naik invented the stethoscope because he couldn’t hear the heart of a young lady because her chest was too big. At that time, doctors could only hear the heart and lungs by holding their ears against the patient’s chest.
But the doctor did not give up and thought of a sound phenomenon: if you point your ear at one end of the wood, you can hear the sound from the other end. La Enék took a piece of paper, folded it into a narrow cylinder, and with the help of this simple device, the heart of a female patient’s heart could finally be heard. Later, the doctor gradually perfected his equipment.