The invention relates to a balloon catheter system (1), comprising: a balloon (2) that extends in an axial direction, surrounds a balloon interior (21) of the balloon and has an outer side (20) facing away from the balloon interior (21), and a catheter (3) that is connected to the balloon (2) and extends in the axial direction (x), the catheter having a lumen (40) by way of which the balloon interior (21) can be filled with a fluid medium (M) for expanding the balloon (2) in a radial direction of the balloon (2). According to the invention, it is provided that the balloon (2) comprises a first and a second annular electrode (5, 6), wherein the two electrodes (5, 6) are disposed on the outer side (20) of the balloon (2), each extend in a circumferential direction (U) of the balloon (20) and are located opposite one another in the axial direction (x), and wherein the first electrode (5) is configured to measure strain of the balloon in the circumferential direction (U) and/or in the radial direction (R) of the balloon (20), and/or wherein the two electrodes (5, 6) are configured to measure the impedance of tissue of a patient resting against the electrodes (5, 6), and/or wherein the two electrodes (5, 6) are configured to measure a redox potential of tissue of the patient contacting the second electrode (6).L'invention concerne un système de cathéter à ballonnet (1), comprenant : un ballonnet (2) qui s'étend dans une direction axiale, entoure un intérieur de ballonnet (21) du ballonnet et a un côté externe (20) opposé à l'intérieur du ballonnet (21), et un cathéter (3) qui est relié au ballonnet (2) et qui s'étend dans la direction axiale (x), le cathéter ayant une lumière (40) au moyen de laquelle l'intérieur du ballonnet (21) peut être rempli d'un milieu fluide (M) pour dilater le ballonnet (2) dans une direction radiale du ballonnet (2). Selon l'invention, le ballonnet (2) comprend une première et une seconde électrode annulaire (5, 6), les deux électrodes (5, 6) é
