Endoscopic sleeve

A device comprising:

• an endoscopic sleeve comprising a tubular member from which extend a plurality of spaced projecting elements, each of which has an initial position, said projecting elements being bendable towards both proximal and distal directions of said tubular member, wherein a force (insertion force) required to bend said projecting elements from said initial positions towards the proximal direction is less than a force (extraction force) required to bend said projecting elements from said initial positions towards the distal direction and a distance all around an outer periphery of said projecting elements decreases as the extraction force increases, and wherein said projecting elements comprise sets of projecting elements, each set spaced axially from one another, and wherein adjacent sets of projecting elements comprise a more proximal set of projecting elements and a more distal set of projecting elements, and the more proximal set of projecting elements is hindered in bending towards said distal direction by abutting against the more distal set of projecting elements.