an adaptation probe for insertion into implanted electrode devices of active medical implants to enable them for use in high - frequency magnetic alternating fields of mri systems comprises an elongated , flexible probe body , and at least one electrical assembly , which has one or more electrical components connected to an interface , in the probe body , and which can be electrically connected to a supply lead of the electrode device such that the electrically properties of the electrode device can be adapted , in particular the frequency - dependent resistance , impedance , capacitance , or inductance thereof .