System (300, 300') for medical treatment, the system (300, 300') comprising a) a medical device (100, 100', 100") to be placed in contact with a patient, wherein the medical device (100, 100', 100") comprises a fluidic conduit (110, 111, 112, 113) and/or is configured to be operatively coupled to a fluidic conduit (410, 411), the medical device (100, 100', 100") further comprising - a flow regulator (120, 120', 120", 122, 124) for regulating the flow of a fluid in the fluidic conduit (110, 111, 112, 113, 410, 411) for medical treatment, - at least two movable elements (106, 107, 106', 107', 113, 125, 108, 149, 186, 190, 191), b) a control device (200, 200'), characterized in that - the at least two movable elements (106, 107, 106', 107', 113, 125, 108, 109, 186, 190, 191) are passively displaceable (106, 107, 106', 107', 113, 186, 191) as a function of a fluidic pressure change in the fluidic conduit or actively displaceable (125, 108, 109, 190) for regulating the flow of fluid in the fluidic conduit, - the medical device (100, 100', 100") further comprises at least one transponder circuit (131, 131', 141, 151, 161, 171, 171', 181,193) comprising at least one transponder element chosen from a capacitor (134, 154, 162, 162', 163, 163', 174, 184, 195), an inductor (132, 133, 133', 142, 152, 153, 164, 172, 173, 172', 182, 183, 194), a resistor (155, 185, 196), or combinations thereof, being arranged with respect to the movable elements (106, 107, 106', 107', 113, 125, 108, 109, 186, 190, 191) such that the transponder circuit (131, 131', 141, 151, 161, 171, 171', 181, 193) has a capacitance or inductance or resistance or resonant frequency or Q factor, which changes as a function of the displacement of the movable elements (106, 107, 106', 107', 113, 125, 108, 109, 186, 190, 191), - the control device (200, 200') comprises a transceiver (231, 231'), wherein the transceiver (231, 231') is configured to transmit energy to the transponder circuit (131, 131', 141, 151, 161, 171, 171', 181, 193) and to read out the capacitance and/or the inductance and/or the resistance and/or the resonant frequency and/or the Q factor of the transponder circuit (131, 131', 141, 151, 161, 171, 171', 181, 193), such as to determine with the same transponder circuit (131, 131', 141, 151, 161, 171, 171', 181, 193) whether there is a displacement of any of the movable elements (106, 107, 106', 107', 113, 125, 108, 109, 186, 190, 191). a) a medical device (100, 100', 100") to be placed in contact with a patient, wherein the medical device (100, 100', 100") comprises a fluidic conduit (110, 111, 112, 113) and/or is configured to be operatively coupled to a fluidic conduit (410, 411), the medical device (100, 100', 100") further comprising - a flow regulator (120, 120', 120", 122, 124) for regulating the flow of a fluid in the fluidic conduit (110, 111, 112, 113, 410, 411) for medical treatment, - at least two movable elements (106, 107, 106', 107', 113, 125, 108, 149, 186, 190, 191), - a flow regulator (120, 120', 120", 122, 124) for regulating the flow of a fluid in the fluidic conduit (110, 111, 112, 113, 410, 411) for medical treatment, - at least two movable elements (106, 107, 106', 107', 113, 125, 108, 149, 186, 190, 191), b) a control device (200, 200'), - the at least two movable elements (106, 107, 106', 107', 113, 125, 108, 109, 186, 190, 191) are passively displaceable (106, 107, 106', 107', 113, 186, 191) as a function of a fluidic pressure change in the fluidic conduit or actively displaceable (125, 108, 109, 190) for regulating the flow of fluid in the fluidic conduit, - the medical device (100, 100', 100") further comprises at least one transponder circuit (131, 131', 141, 151, 161, 171, 171', 181,193) comprising at least one transponder element chosen from a capacitor (134, 154, 162, 162', 163, 163', 174, 184, 195), an inductor (132, 133, 133', 142, 152, 153, 164, 172, 173, 172', 182, 183, 194), a resistor (155, 185, 196), or combinations thereof, being arranged with respect to the movable elements (106, 107, 106', 107', 113, 125, 108, 109, 186, 190, 191) such that the transponder circuit (131, 131', 141, 151, 161, 171, 171', 181, 193) has a capacitance or inductance or resistance or resonant frequency or Q factor, which changes as a function of the displacement of the movable elements (106, 107, 106', 107', 113, 125, 108, 109, 186, 190, 191), - the control device (200, 200') comprises a transceiver (231, 231'), wherein the transceiver (231, 231') is configured to transmit energy to the transponder circuit (131, 131', 141, 151, 161, 171, 171', 181, 193) and to read out the capacitance and/or the inductance and/or the resistance and/or the resonant frequency and/or the Q factor of the transponder circuit (131, 131', 141, 151, 161, 171, 171', 181, 193), such as to determine with the same transponder circuit (131, 131', 141, 151, 161, 171, 171', 181, 193) whether there is a displacement of any of the movable elements (106, 107, 106', 107', 113, 125, 108, 109, 186, 190, 191).