The present invention relates to an apparatus comprising at least one multi-lumen tube, wherein the tube has a first group of lumens and a second group of lumens wherein the lumens of the second group are arranged around the lumen(s) of the first group, and wherein the lumen(s) of the first group serve the transportation of at least one first fluid, and wherein the lumens of the second group are filled with at least one functional fluid, wherein the apparatus furthermore comprises at least one actuator which is in communication with at least one of the second lumens and is configured such that at least one property of the functional fluid can be changed by means of the actuator.
