Magnet arrangement for bone conduction hearing implant
An implantable magnetic transducer arrangement is described for a hearing implant in a recipient patient. An implant housing hermetically encapsulates an interior housing volume and is fixedly attached to skull bone beneath the skin of the patient. A magnetic transducer is located within the housing volume and includes multiple pie-shaped permanent magnets wherein adjacent magnets have different direction magnetic polarities, and one or more suspension elements that resiliently couple adjacent magnets to allow their relative movement. The magnetic transducer is operatively coupled to an external magnetic drive component above the skin of the patient to form an oscillating system that develops a mechanical stimulation signal to the implant housing for delivery by bone conduction of the skull bone as an audio signal to the cochlea of the patient.
1. An implantable magnetic transducer arrangement for a hearing implant in a recipient patient, the arrangement comprising:
an implant housing hermetically encapsulating an interior housing volume and adapted to be fixedly attached to skull bone beneath the skin of the patient;
a magnetic transducer within the housing volume having:
i. a plurality of pie-shaped permanent magnets arranged with alternatingly different direction magnetic polarities; and
ii. one or more suspension elements resiliently coupling adjacent magnets to allow their movement relative to each other;
wherein the magnetic transducer is operatively coupled to an external magnetic drive component above the skin of the patient; and
wherein the magnetic transducer and the external magnetic drive component are configured to cooperate together to form an oscillating system that develops a mechanical stimulation signal to the implant housing for delivery by bone conduction of the skull bone as an audio signal to the cochlea of the patient;
wherein the suspension elements include a spring membrane resiliently and directly coupling adjacent magnets.
2. A transducer arrangement according to claim 1 , wherein size and shape of each magnet is identical.
3. A transducer arrangement according to claim 1 , wherein the magnets have a plurality of different sizes and shapes.
4. A hearing implant system having an implantable magnetic transducer arrangement according to any of claims 1 - 3 .