# US 9,872,993 B2 · MRI-safe implant magnet with angular magnetization

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- Number: US 9,872,993 B2
- Document ID: US9872993B2
- Status: Granted
- Kind: B2
- Application number: 13/932,315
- Filed: 2013-07-01
- Published: 2014-01-09
- Granted: 2018-01-23
- Earliest claimed: 2012-07-03
- Assignees: MED-EL Elektromedizinische Geraete GmbH
- Applicants: MED-EL Elektromedizinische Geraete GmbH
- Inventors: Martin Zimmerling
- Web page: https://patentgrep.com/patent/US9872993B2

## CPC

- A61N 1/37229: {Shape or location of the implanted or external antenna}
- A61N 1/36036: {of the outer, middle or inner ear}
- A61N 1/36038: {Cochlear stimulation}
- A61N 1/3718: {Monitoring of or protection against external electromagnetic fields or currents}
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)

## Abstract

A magnetic arrangement is described for an implantable system for a recipient patient. An implantable coil housing contains a signal coil for transcutaneous communication of an implant communication signal. Freely rotatable within the coil housing is a cylindrical implant magnet for transcutaneous magnetic interaction with a corresponding external attachment magnet. The implant magnet has a central cylinder axis of symmetry, and a magnetization direction along a magnetic axis angled away from the axis of symmetry at a non-zero angle less than 45 degrees.

## Claims

### Claim 1

A magnetic arrangement for an implantable system for a recipient patient, the arrangement comprising:
an implantable coil housing containing a signal coil for transcutaneous communication of an implant communication signal;
a cylindrical implant magnet freely rotatable within the coil housing for transcutaneous magnetic interaction with a corresponding external attachment magnet, the implant magnet having:
i. a central cylinder axis of symmetry, and
ii. a magnetization direction along a magnetic axis angled away from the axis of symmetry at a non-zero angle less than 45 degrees.

### Claim 2 (depends on 1)

An arrangement according to claim 1, wherein the magnetic axis is angled away from the axis of symmetry at an angle of more than 10 degrees.

### Claim 3 (depends on 2)

An arrangement according to claim 2, wherein the magnetic axis is angled away from the axis of symmetry at an angle of less than 30 degrees.

### Claim 4 (depends on 1)

An arrangement according to claim 1, wherein the magnetic axis is angled away from the axis of symmetry at an angle of 20 degrees.

### Claim 5 (depends on 1)

An arrangement according to claim 1, further comprising:
a lubrication coating covering at least a portion of the implant magnet and reducing rotational friction between the implant magnet and the coil housing.

### Claim 6 (depends on 1)

An arrangement according to claim 1, wherein the implantable system is a cochlear implant system.

### Claim 7 (depends on 1)

An arrangement according to claim 1, wherein the implantable system is a middle ear implant system.

### Claim 8 (depends on 1)

An arrangement according to claim 1, wherein the implantable system is a vestibular implant system.