Insertion element and insertion device

摘要

The element (100) has a sleeve (10) provided with a distal end and a proximal end (30) that is opposite to the distal end. A sleeve comprises an expandable region (10a) that is transferred from a first state of small clear cross section at the proximal end into a second state of larger clear cross section at the proximal end. The expandable region of the sleeve is flatter in the first state than in the second state. The expandable region of the sleeve is folded out and/or opened and/or fanned out from the first state into the second state.