Patent ID: 9113268
Filing Date: 2015-08-18
Classification: H04R

Abstract:
1. An implantable floating mass transducer of a hearing implant system for an implant patient, the transducer comprising: a cylindrical transducer housing attachable to an internal hearing structure and having an outer housing surface; a cylindrical inner mass magnet within an interior volume of the transducer housing having an inner magnetic field with a first field direction; at least one signal drive coil on the outer housing surface for conducting a transducer drive signal current to produce a signal magnetic field that interacts with the inner magnetic field to create vibration of the inner mass magnet which is coupled by the transducer housing to the internal hearing structure for sound perception by the implant patient; a ring-shape outer offset magnet around the outer housing surface and having an outer magnetic field with a second field direction opposite to the first field direction to offset the inner magnetic field to minimize their combined magnetic field and thereby minimize magnetic interaction of the transducer with any external magnetic field; a plurality of outer springs located between the outer housing surface and the outer offset magnet configured to suspend the outer offset magnet over the outer housing surface; and a plurality of inner anti-torque springs located within the interior volume of the transducer housing between an inner housing surface that is parallel to the outer housing surface and the inner mass magnet configured to suspend the inner mass magnet within the interior volume of the transducer housing.