Abstract: The invention relates to a device consisting of a catheter (K) for introducing into the human or animal body and to the use of said device. The inventive device is characterized in that at least a part of the catheter is elastic. At least one sensor unit (PS) for determining the current position is provided at least in the elastic part of the catheter (KK), preferably on its inner surface. Outside the body, a receiver unit is provided to which the signals measured by the sensor unit (PS) are transmitted.

Abstract: A method for determining the position of a sensor element which is used to measure a magnetic alternating field emitted by at least one generator unit. The sensor element receives a signal. Interference fields, which are the fields arising due to eddy currents generated in electrically conductive objects, are calculated. The eddy currents are calculated based on the alternating field. The position can be corrected based on the signal received in the sensor element.

Abstract: The invention relates to a method for determining the position of a sensor element (300), according to which a magnetic alternating field (210) emitted by at least one field generating unit (200) is measured. The position of the sensor element (300) is determined on the basis of a signal received in the sensor element (300). The inventive method is further characterized in that interference fields (410) are calculated, preferably to a first approximation, said interference fields being caused by eddy currents (420) produced in electrically conductive objects (400). The position that can be determined on the basis of the signal received in the sensor element (300) is corrected on the basis of the calculated interference fields (410).