An annunciator for an organ stimulating system implantable in the body of a person comprises a hollow canister having a cylindrical internal cavity, first and second electrically conductive coils encircling the canister lying in transverse, preferably perpendicular, planes which intersect along the longitudinal...http://www.google.fr/patents/US6178079?utm_source=gb-gplus-shareBrevet US6178079 - Magnetic annunciator
