Disposable endoscope sheath with replaceable front end protrusion

The utility model provides a disposable endoscope sheath with a replaceable front end protrusion. The disposable endoscope sheath with the replaceable front end protrusion comprises a sheath tube formed by a sight glass cavity and an instrument channel, wherein the sight glass cavity and the instrument channel are independent. An inserting groove, flanges and a stoppage platform which is not placed in the same plane with the flanges are arranged on the lower portion of the front end of the sight glass cavity, wherein the flanges are arranged on two sides of the inserting groove. A replacing groove with the replaceable protrusion is formed by the inserting groove and the flanges. The inserting groove is arranged at the front end of the instrument channel. The disposable endoscope sheath with the replaceable front end protrusion has the advantages that the protrusion with appropriate height and angle can be selected according to use demand in the process of using of the disposable endoscope sheath, and therefore a user only needs to replace the protrusion rather than the sheath tube. According to the design, design cost of the endoscope is reduced, and market competitiveness of the endoscope is improved. In terms of product safety, a trapezoidal swallow tail structure is designed, and therefore the protrusion is safe and can not fall off in the downward direction. The disposable endoscope sheath with the replaceable front end protrusion has the advantages of being simple in structure, novel in design, low in machining cost, safe, reliable and the like.