# US 7,744,525 B2 · Moving coil actuator for middle ear implants

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- Number: US 7,744,525 B2
- Document ID: US7744525B2
- Status: Granted
- Kind: B2
- Application number: 11/782,123
- Filed: 2007-07-24
- Published: 2008-01-24
- Granted: 2010-06-29
- Earliest claimed: 2006-07-24
- Assignees: MED-EL Elektromedizinische Geraete GmbH
- Inventors: Ingeborg Hochmair; Erwin S. Hochmair
- Web page: https://patentgrep.com/patent/US7744525B2

## CPC

- H04R 25/606: {acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window}
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

A hearing enhancement includes an audio processor that generates an electrical audio signal and transmits the signal to a coil. The coil is implanted into a patient in a position that results in transmission of mechanical stimulation to the inner ear when the coil is spatially displaced. A permanent magnet is placed in proximity to the coil so that when the coil receives the electrical audio signal form the processor, the induced coil magnetic field in the coil interacts with the magnetic field from the permanent magnet to spatially displace the coil and, as a result, transmit the mechanical stimulation to the inner ear.

## Claims

### Claim 1

A hearing enhancement system comprising: an audio processor for generating an audio electrical signal; a permanent magnet having an associated permanent magnet field, the permanent magnet for affixing to a recess in a bone of a skull proximal to an ear of a patient; and an implantable stimulation coil mechanically coupleable to an inner of the patient for receiving the audio electrical signal, and in response generating a coil magnetic field that interacts with the permanent magnetic field so as to displace the stimulation coil and mechanically stimulate the inner with an audio mechanical signal corresponding to the audio electrical signal.

### Claim 2 (depends on 1)

A system according to claim 1, wherein the permanent magnet includes and outer layer of biocompatible material.

### Claim 3 (depends on 2)

A system according to claim 2, wherein the biocompatible material is selected from the group consisting of: titanium niobium, tantalum, and stainless steel.

### Claim 4 (depends on 1)

A system according to claim 1, wherein the permanent magnet includes an outer layer of material to prevent corrosion of the magnet.

### Claim 5 (depends on 1)

A system according to claim 1, further including a microphone for converting an input acoustic signal into a representative microphone electrical signal output to the audio processor.