Patent ID: 8744106
Filing Date: 2014-06-03
Classification: H04R

Abstract:
1. A floating mass transducer for a hearing implant comprising: a cylindrical transducer housing attachable to a middle ear hearing structure and having a cylinder axis and an outer surface with one or more electric drive coils thereon; a cylindrical transducer magnet arrangement positioned within an interior volume of the transducer housing and including a magnetic pair of: wherein the inner rod magnet and the outer annular magnet each comprise a pair of magnets positioned mechanically held against each other end to end with like magnetic polarities meeting; wherein current flow through the drive coils creates a coil magnetic field that interacts with the magnetic fields of the transducer magnet arrangement to create vibration in the transducer magnet which is coupled by the transducer housing to the middle ear hearing structure for perception as sound; and wherein the opposing magnetic fields of the transducer magnet arrangement cancel each other to minimize their combined magnetic field and thereby minimize magnetic interaction of the transducer magnet arrangement with any external magnetic field.