The utility model discloses a snakelike hard
endoscope sheathing canal which comprises a main
endoscope sheathing canal, an outer tube, an inner tube, a connecting tube, an air bag, an inflation tube and an inflation
nozzle, the main
endoscope sheathing canal is a double-wall snakelike stainless
steel tube which is formed by sleeving the outer tube outside the inner tube and fusing the tube walls of the outer tube and the inner tube at two ends, the main endoscope sheathing canal can be freely bent, and the connecting tube is a single-layer
solid-wall stainless steel
straight tube. The inflating tube is arranged in the wall of the connecting tube, one end of the inflating tube is communicated with the air bag, the other end of the inflating tube is communicated with the inflating
nozzle, and the inflating
nozzle is a self-closing switch device arranged on the connecting tube and can be connected with an inflating and deflating device to pressurize and inflate the air bag through the inflating tube. The main endoscope sheathing canal is in a straight
pipe shape under the
pressure action of the air bag; the snakelike hard endoscope sheathing canal further comprises a treatment channel opening, a
breathing machine connector and a front tongue. The
flexible endoscope sheath tube has the advantages that the main endoscope sheath tube adopts the snakelike design, the air bag can be guided by the
flexible endoscope to be freely bent and easily inserted into an air passage when not inflated, and the air bag is pressurized and inflated to be straight after being inserted, so that the
flexible endoscope and instruments can conveniently pass through.