for the sake of clarity the individual feed lines are not shown in greater detail the same applies to fig7 a locally defined curvature can also be achieved here fig9 is a diagram showing in schematic form an example of the deformation of a catheter 2 that is achievable by separate activation of individual flexural elements a plurality of individual flexural elements 12 are distributed along the length of part of the catheter said elements can either be distributed in segments as shown in fig7 or staggered in a spiral arrangement as shown in fig8 a total of six different flexural points a b c d e and f are shown in fig9 in order to achieve flexure at the flexural point a the flexural element 12 g is activated and the adjacent in particular opposite flexural elements 12 remain non pressurized and therefore flexible in order to achieve flexure at the flexural point b the flexural element 12 h is activated and in order to achieve flexure at the flexural point c the flexural element 12 i is activated a similar procedure is followed in order to achieve flexure at the flexural point d and here the flexural element 12 j is activated by the feed device in order to achieve flexure at the flexural point e the flexural element 12 k is activated and finally in order to achieve flexure at the flexural point f the flexural element 121 is activated as the diagram.