Respiratory tract flushing tube of fiber bronchoscope, fiber bronchoscope and matched device

A respiratory tract flushing pipe of a fiber bronchoscope, the fiber bronchoscope and a matched device are characterized in that the flushing pipe is composed of a flushing liquid pipe (3) inserted into an instrument channel of an endoscope outer pipe and a liquid suction pipe (1) positioned in the flushing liquid pipe (3), the flushing liquid pipe (3) is inserted into the instrument channel of the endoscope outer pipe, a flushing channel (2) is formed between the flushing liquid pipe (3) and the liquid suction pipe (1), and the flushing liquid pipe (3) and the liquid suction pipe (1) are communicated with the flushing channel (2). The front end of the liquid suction pipe (1) extends out of the flushing pipe (3), and the outer surface of the front end is of an arc-shaped or conical guide structure so that liquid sprayed out of the flushing channel (2) can be guided and sprayed to the wall of a trachea; the rear end of the liquid suction pipe (1) extends out of the liquid flushing pipe (3) and is communicated