Proktoskop, wobei das Proktoskops über die gesamte Länge einen Längesschlitz aufweist.The proctoscope has a longitudinal slot (4) that is arranged over an entire length direction. The width of the longitudinal slot is set from 0.1 mm up to 15 mm. The internal diameter of the proctoscope main portion is set from 10 mm up to 25 mm. The proctoscope main portion is made of metal or plastic material. A semi-flexible tubular wall is rolled up such that the slot is opened or closed.