Hysteroscopic system, comprising • a straight forward rigid hysteroscope, having • a main body with a parallel eyepiece, a light source adapter for connecting a light source, • a tube having an outer shaft, a distal end with a distal window, • that tube having a fiber optic light transmission and an optical system with rod lenses incorporated, and equipped with at least one working channel, • that tube fixed with the main body, • an axially rotatable irrigation system with separate channels for inflowing and outflowing fluid, the irrigation system comprising a quick lock irrigation distributor configured to perform distribution of the fluid, • the main body of that hysteroscope being connected to the axially rotatable irrigation system by means of a quick lock system where the rotation of the irrigation system does not interfere with the position of the tube of the hysteroscope, its working channel, its fiber optic light transmission system, its optical system, and its main body, and • means for irrigating fluid at the distal end of the tube, wherein the quick lock system comprises • at least two quick lock adapters (3, 15) being of annular cross-section shape, the inner one of them in touch with the tube and the outer one in touch with the main body, and both of them assembled together, • characterised in that the quick lock system further comprises a lock for the outer shaft, having a greater diameter than the outer one of the at least two quick lock adapters and assembled in touch with the outer quick lock adapter, • a quick lock push button to move the lock for the outer shaft to a side, • a quick lock fixation as guidance for the movement of the lock for the outer shaft, • at least two pin-receptive openings in the outer one of the quick lock adapters, • quick-lock pins movable along the pin-receptive openings, the quick-lock pins being assembled to the lock for the outer shaft, wherein pressing down the quick lock button causes the lock for the outer shaft to move to a side so that the quick lock pins are moved along the pin-receptive openings, a quick lock closing mechanism of the quick lock irrigation distributor, placed adjacent to the lock for the outer shaft, and • a cavity in the quick lock closing mechanism which fits exactly with the quick lock pins assembled to the lock for the outer shaft, such that a locking of the irrigation system is performed by pushing the quick lock closing mechanism into the two joint quick lock adapters (3, 15) whereby the quick lock pins receive the quick lock closing mechanism. • a straight forward rigid hysteroscope, having • a main body with a parallel eyepiece, a light source adapter for connecting a light source, • a tube having an outer shaft, a distal end with a distal window, • that tube having a fiber optic light transmission and an optical system with rod lenses incorporated, and equipped with at least one working channel, • that tube fixed with the main body, • an axially rotatable irrigation system with separate channels for inflowing and outflowing fluid, the irrigation system comprising a quick lock irrigation distributor configured to perform distribution of the fluid, • the main body of that hysteroscope being connected to the axially rotatable irrigation system by means of a quick lock system where the rotation of the irrigation system does not interfere with the position of the tube of the hysteroscope, its working channel, its fiber optic light transmission system, its optical system, and its main body, and • means for irrigating fluid at the distal end of the tube, wherein the quick lock system comprises • at least two quick lock adapters (3, 15) being of annular cross-section shape, the inner one of them in touch with the tube and the outer one in touch with the main body, and both of them assembled together, • characterised in that the quick lock system further comprises a lock for the outer shaft, having a greater diameter than the outer one of the at least two quick lock adapters and assembled in touch with the outer quick lock adapter, • a quick lock push button to move the lock for the outer shaft to a side, • a quick lock fixation as guidance for the movement of the lock for the outer shaft, • at least two pin-receptive openings in the outer one of the quick lock adapters, • quick-lock pins movable along the pin-receptive openings, the quick-lock pins being assembled to the lock for the outer shaft, wherein pressing down the quick lock button causes the lock for the outer shaft to move to a side so that the quick lock pins are moved along the pin-receptive openings, a quick lock closing mechanism of the quick lock irrigation distributor, placed adjacent to the lock for the outer shaft, and • a cavity in the quick lock closing mechanism which fits exactly with the quick lock pins assembled to the lock for the outer shaft, such that a locking of the irrigation system is performed by pushing the quick lock closing mechanism into the two joint quick lock adapters (3, 15) whereby the quick lock pins receive the quick lock closing mechanism.