Endoscope with an adjustable viewing direction

An endoscope with an adjustable viewing direction, comprising:

• a shaft;
• an image transmission device for transmitting an image from a distal end of the endoscope to a proximal end of the endoscope;
• a hermetically tight sheath around the image transmission device, with a light admission window at the distal end of the endoscope and a light exit window at the proximal end of the endoscope, wherein the light admission window has an optically transparent window component that hermetically seals the light admission window, and the light exit window has an optically transparent window component that hermetically seals the light exit window;
• a manipulating device at the proximal end of the endoscope;
• a swivel actuation device on the manipulating device, for manual adjustment of an angle between the viewing direction and a longitudinal axis of the shaft;
• a magnetic coupling device for magnetically transmitting a force, parallel to the longitudinal axis of the shaft, between the swivel actuation device and a force transmission device inside the hermetically tight sheath, in which the magnetic coupling device comprises an annular component with a rotationally symmetrical inner face, of which the diameter increases continuously in a direction parallel to the longitudinal axis of the shaft, inside the hermetically tight sheath;
• and
• a rotation actuation device on the manipulating device, for manually rotating the viewing direction about the longitudinal axis of the shaft relative to the manipulating device;
• wherein a first portion of the hermetically tight sheath disposed inside the manipulating device has a first cross-sectional area, a second portion of the hermetically tight sheath proximate the distal end of the endoscope has a second cross-sectional area, and the first cross-sectional area is larger than the second cross-sectional area.