1. A hysteroscopic system, comprising: an endoscope having an outer surface and an inner channel defined by an inner surface； a casing connected to the endoscope with a possibility of removal and having an end on which a distal flange is provided extending inside toward the outer surface of the endoscope, the casing having an inner surface； an outlet channel formed between the inner surface of the casing and the outer surface of the endoscope； an operating channel formed in the inner channel of the endoscope； visualization channel adjacent to the surgical channel. 2. The hysteroscopic system of claim 1, wherein the distal flange has an uneven shape. The hysteroscopic system of claim 1, wherein the surgical instrument is selected from the group consisting of: a rotary action morcellator, a reciprocating action morcellator, or a rotational and reciprocal action morcellator. The hysteroscopic system according to claim 1, wherein the visualization channel is configured to accommodate a visualization device therein. A hysteroscopic system for performing a medical procedure, comprising: an endoscope having an outer surface and an inner surface defining an inner channel； a casing removably connected with an endoscope having an outer surface, an inner surface and a flange located at a distal end of the casing and extending inwardly in a direction the outer surface of the endoscope； an operative element located in the inner channel of the endoscope, having an inner surface and an outer surface located at a certain distance1. Гистероскопическая система, содержащая:эндоскоп, имеющий наружную поверхность и внутренний канал, определенный внутренней поверхностью；кожух, соединенный с эндоскопом с возможностью снятия и имеющий конец, на котором предусмотрен дистальный фланец, проходящий внутри в направлении наружной поверхности эндоскопа, причем кожух имеет внутреннюю поверхность；выпускной канал, образованный между внутренней поверхностью кожуха и наружной поверхностью эндоскопа；оп
