| 摘要 |
<p>A floating mass transducer for a hearing implant is described. A cylindrical transducer housing is attachable to a middle ear hearing structure and has an outer surface with one or more electric drive coils thereon. A cylindrical transducer magnet arrangement is positioned within an interior volume of the transducer housing and includes a magnetic pair of: i. an inner rod magnet disposed along the cylinder axis with a first magnetic field direction, and ii. an outer annular magnet surrounding the inner rod magnet along the cylinder axis with a second magnetic field direction opposite to the first magnetic field direction. 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. In addition, 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.</p> |
