part 2 c of the segment region 2 is attached to the second wing 14 b when the wings 14 a and 14 b are rotated against one another the lifting slopes 111 and 112 ensure that the two wings 14 a and 14 b must axially move apart in this process the proximal region 2 a of the segment region is pushed forwards the distal region 1 with the tip 1 a is pulled backwards by the pull wire 5 as a result the stack of segments 2 b is subjected to a compressive force and the segments can no longer tilt relative to one another as a result the complete mechanism behaves like a rigid rod fig4 shows a device for introduction into a body comprising an integrated sensor region 2 a the segment region 2 and a contacting region 118 for electrically contacting the sensor the proximal region 2 c of the introducing device 10 is detachably connected to an applicator 116 which facilitates the insertion of the device 10 in order to ensure an adequate guidance of the device 10 during the insertion the device 10 is placed in an insertion sleeve 115 which prevents bending or slipping of the device 10 when it is inserted into.