A device for surgical operations on a prolapse, comprising a hollow stretcher body (2) having a prevalent development direction along a longitudinal axis (A) and being insertable in an orifice, the stretcher body (2) exhibiting a through-window (7), defining an area of intervention and realising a communication between an internal cavity (3) of the stretcher body (2) and a portion of a prolapse, a mobile wall (8) defining the through-window (7) in combination with the stretcher body (2) and being slidably associated to the stretcher body (2) in order to open and/or close the through-window (7) between a configuration of minimum extension and a configuration of maximum extension of the through-window (7)； characterised in that it comprises means for blocking (10) which act between the mobile wall (8) and the stretcher body (2) in order to maintain the through- window (7) stably in the configuration of minimum extension during insertion of the stretcher body (2).
