<p>Apparatus and method for endoscopic examination of a tubular conduit are described. The apparatus is provided with an insertion tube fitted at a distal end thereof with an optical head for visualization of the conduit's interior. The insertion tube is coupled with a major inflatable sleeve, which upon inflation is capable of propelling the endoscope within the conduit. The insertion tube is also coupled with the at least one auxiliary inflatable sleeve, which upon inflation thereof provides additional propelling force for advancement of the insertion tube within the conduit. By inflating the major sleeve and the at least one auxiliary sleeve, it is possible to distribute the propulsion force along the insertion tube.</p>
