Totally implantable hearing system

• US 20050261544A1
• Filed: 03/18/2005
• Published: 11/24/2005
• Est. Priority Date: 03/22/2004
• Status: Active Grant

• Current Assignee: The Board of Regents of the University of Colorado (University of Colorado System)
• Original Assignee: The Board of Regents of the University of Colorado (University of Colorado System)
• Inventors: Gan, Rong Z.
• Granted Patent: US 7,651,460 B2
• Time in Patent Office: Days
• US Class Current: 600/25
• CPC Class Codes: H04R 11/02 Loudspeakers
• CPC Class Codes: H04R 19/016 for microphones
• CPC Class Codes: H04R 25/558 Remote control, e.g. of amplification, frequency
• CPC Class Codes: 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

Abstract

A totally implantable hearing system having a sound processing device, a coil assembly, and a magnet assembly. The magnet assembly is implanted in the middle ear of a user and is in contact with at least a portion of an ossicle of the middle ear. The sound processing device receives and converts sound into an electrical signal. The coil assembly receives and converts the electrical signal from the sound processing device into an electromagnetic signal, and transmits the electromagnetic signal into the middle ear of the user such that the electromagnet signals interact with the magnet assembly, thereby causing the magnet assembly and the ossicle to vibrate thereby creating the perception of sound in the user. The coil assembly is preferably implanted within the bony canal wall adjacent the outer ear canal of the user such that at least a portion of the coil assembly extends into the middle ear space of the user. The system preferably has a spacer connected to the magnet assembly and/or the coil assembly to substantially maintain a spatial separation between the magnet assembly and the coil assembly, while allowing for the magnet assembly to vibrate the ossicle in response to the electromagnetic signal transmitted by the coil assembly.

Claims

1. A hearing system for improving a user'"'"'s hearing, comprising:

a sound processing device adapted to receive and convert sound into an electrical signal;

a coil assembly for receiving the electrical signal from the sound processing device and converting the electrical signal into an electromagnetic signal and wherein the coil assembly is sized to be implanted in a trough within a bony canal wall of the user adjacent to and separate from an ear canal of the user; and

a magnet assembly adapted to be positioned within a middle ear of an ear of the user and in contact with at least a portion of an ossicle within the middle ear, wherein the magnet assembly is vibratingly responsive to the electromagnetic signal transmitted by the coil assembly.

2. The hearing system of claim 1, wherein the hearing system is totally implantable within the user.

3. The hearing system of claim 1, wherein the coil assembly can be positioned in the bony canal wall such that at least a portion of the coil assembly protrudes from the bony canal wall into a middle ear space of the middle ear of the user.

4. The hearing system of claim 3, wherein the coil assembly can be positioned such that a distal tip of the coil assembly is spaced a distance of about 1 millimeter to about 4 millimeters from the magnet assembly.

5. The hearing system of claim 4, further comprising a spacer engaged with at least one of the magnet assembly and the coil assembly and disposed between the coil assembly and the magnet assembly such that the spacer substantially maintains a spatial separation between the magnet assembly and the coil assembly while allowing for the magnet assembly to vibrate the ossicle in response to the electromagnetic signal transmitted by the coil assembly.

6. The hearing system of claim 1, wherein the coil assembly comprises:

a core structure constructed of a material having a high permeability; and

a coiled wire structure adapted to receive the electrical signal from the sound processing device, at least a portion of the coiled wire structure comprising a plurality of turns about at least a portion of the core structure so as to form a coil portion such that when the coiled wire structure receives the electrical signal, the electromagnetic signal is induced in the coil portion and transmitted toward the magnet assembly.

7. The hearing system of claim 6, wherein the coil assembly further comprises a biocompatible casing adapted to house at least a portion of the core structure and at least a portion of the coiled wire structure.

8. The hearing system of claim 6, wherein the core structure of the coil assembly comprises:

a core arm having a substantially cylindrical shape with a first end and a second end;

a core tail having a substantially cylindrical shape, the core tail extending from the second end of the core arm and wherein the core tail has an outer diameter which is greater than an outer diameter of the core arm; and

wherein the coil portion of the coiled wire structure is disposed about at least a portion of the core arm of the core structure of the coil assembly.

9. The hearing system of claim 8, wherein the core arm has a length in a range of about 5.0 millimeters to about 14.0 millimeters.

10. The hearing system of claim 8, wherein the core tail has a length in a range of about 0.0 millimeters to about 2.0 millimeters.

11. The hearing system of claim 8, wherein the outer diameter of the core arm has a range of about 0.2 millimeters to about 0.8 millimeters.

12. The hearing system of claim 8, wherein the outer diameter of the core tail has a range of about 0.2 millimeters to about 1.2 millimeters.

13. The hearing system of claim 8, wherein the coil portion has a length in a range of about 6.0 millimeters to about 10.0 millimeters.

14. The hearing system of claim 8, having a distance between the first end of the core arm and the coiled wire structure in a range of about 0.0 millimeters to about 2.0 millimeters.

15. The hearing system of claim 1, wherein the sound processing device is sized and adapted to be implanted in a portion of a skull of the user.

16. The hearing system of claim 15, wherein the sound processing device is sized and adapted to be implanted in a mastoid area of a temporal bone near the ear of the user.

17. The hearing system of claim 1, wherein the sound processing device comprises a microphone for receiving sound waves, and a sound processor electrically connected to the microphone, wherein the microphone and sound processor cooperate to convert the sound waves received by the microphone into the electrical signal transmitted to the coil assembly.

18. The hearing system of claim 17, wherein the sound processing device further comprises a radio frequency signal receiver for receiving a radio frequency signal for adjusting the electric signal transmitted to the coil assembly by the sound processor.

19. The hearing system of claim 17, wherein the sound processing device further comprises a rechargeable battery.

20. The hearing system of claim 17, wherein the sound processing device further comprises a biocompatible housing for containing the microphone and the sound processor.

21. A hearing system for improving a user'"'"'s hearing, comprising:

a sound processing device adapted to receive and convert sound into an electrical signal;

a coil assembly for receiving the electrical signal from the sound processing device and converting the electrical signal into an electromagnetic signal and wherein the coil assembly is sized to be implanted in a trough within a bony canal wall of the user adjacent to and separate from an ear canal of the user;

a magnet assembly adapted to be positioned within a middle ear of an ear of the user and in contact with at least a portion of an ossicle within the middle ear, wherein the magnet assembly is vibratingly responsive to the electromagnetic signal transmitted by the coil assembly; and

a spacer engaged with at least one of the magnet assembly and the coil assembly and disposed between the coil assembly and the magnet assembly such that the spacer substantially maintains a spatial separation between the magnet assembly and the coil assembly while allowing for the magnet assembly to vibrate the ossicle in response to the electromagnetic signal transmitted by the coil assembly.

22. The hearing system of claim 21, wherein the hearing system is totally implantable.

23. A method of enhancing a patient'"'"'s hearing by mechanically stimulating ossicles in a middle ear of the patient, comprising:

implanting in the patient'"'"'s skull a sound processing device adapted to receive and convert sound into an electrical signal;

implanting a coil assembly into an artificially created trough in a bony canal wall of the patient, the coil assembly for receiving the electrical signal from the sound processing device and converting the electrical signal into an electromagnetic signal; and

implanting in the middle ear of the patient a magnet assembly and attaching the magnet assembly to at least a portion of an ossicle within the middle ear, wherein the magnet assembly is vibratingly responsive to the electromagnetic signal transmitted by the coil assembly for causing vibrations in the ossicle.

24. The method of claim 23, wherein the coil assembly is positioned in the bony canal wall such that at least a portion of the coil assembly protrudes from the bony canal wall into a middle ear space of the middle ear of the patient.

25. The method of claim 24, further comprising disposing a spacer between the magnet assembly and the coil assembly which engages at least one of the magnet assembly and the coil assembly such that the spacer substantially maintains a spatial separation between the magnet assembly and the coil assembly while allowing for the magnet assembly to vibrate the ossicle in response to the electromagnetic signal transmitted by the coil assembly.