An endoscope with a flexible, multilumen catheter probe, a grip provided at the proximal end of the probe, a control element attached to the distal end of the probe and movably guided in the axial direction on catheter probe, wherein the catheter probe is to be connected non-rotatingly to the grip by means of a releasable lock, the distal end of the optical lumen has a transparent seal, and optical system is displacably disposed inside optic lumen and can be removed from optic lumen.