Abstract: The invention relates to an implantable medical device system comprising an active medical device having or connected to at least one electrode and circuitry connected to the electrode. The active medical device comprises a telemetry unit. The circuitry connected to the electrode comprises at least one single conductor that provides a radio frequency antenna for the telemetry unit. The implantable medical device system further comprises at least one electronic filter that is arranged between the single conductor of circuitry connected to the electrode and the telemetry unit. The least one electronic filter comprises at least one inductor having a core that comprises a ferromagnetic material with saturating behavior when exposed to an external magnetic field.

Abstract: The invention relates to an implantable medical device system comprising an active medical device having or connected to at least one electrode and circuitry connected to the electrode. The active medical device comprises a telemetry unit. The circuitry connected to the electrode comprises at least one single conductor that provides a radio frequency antenna for the telemetry unit. The implantable medical device system further comprises at least one electronic filter that is arranged between the single conductor of circuitry connected to the electrode and the telemetry unit. The least one electronic filter comprises at least one inductor having a core that comprises a ferromagnetic material with saturating behavior when exposed to an external magnetic field.

Abstract: A magnetic field sensor includes at least one sensing circuit including giant magnetoresistive (GMR) elements. At least one of the GMR elements is at least partially housed in a flux-reducing or flux-concentrating first shielding material that reduces or amplifies, respectively, the magnetic field impinging on the element(s), while at least one other GMR element is housed in a second shielding material having an effect opposite that of the first shielding material, or is not housed in any shielding material. A measurement circuit is configured to measure voltage between different points of the GMR sensing circuit, allowing derivation of electric impedance between the different measurement points. An evaluation circuit evaluates the impedances and the relationships therebetween to derive a signal that indicates the strength of an applied magnetic field.