It seems that when I was a child, my teacher told a story. It is said that the German doctor Cosmore was greatly inspired when he watched a sword swallowing performance by Jianghu artists. He selected a straight metal tube with a length of about half a meter and a diameter of more than 1 cm, and made a rigid tube mirror with a little equipment. With the cooperation of the Jianghu artist, Cousmore inserted the rigid endoscope into the stomach through the artist's mouth. Under the light of the oil lamp, Cousmore actually vaguely saw the gastric mucosa of the Jianghu artist through the hard tube mirror.

Medical instruments that can be regarded as the prototype of endoscope were found in the ruins of Pompeii (the ancient capital of Italy) in the first century.

In the 18th century, some surgeons used tubes and candles to observe the rectum, hoping to examine human internal organs without surgery.

the birth of Baidu's endoscope, its origin and development.