Hearing system having an open chamber for housing components and reducing the occlusion effect

• US 7,668,325 B2
• Filed: 05/03/2005
• Issued: 02/23/2010
• Est. Priority Date: 05/03/2005
• Status: Active Grant

• Current Assignee: EarLens Corporation
• Original Assignee: EarLens Corporation
• Inventors: Perkins, Rodney C., Puria, Sunil
• Primary Examiner(s): Kuntz; Curtis
• Assistant Examiner(s): Elbin; Jesse A
• Application Number:
  US11/121,517
• Publication Number:
  US 20060251278A1
• Time in Patent Office: 1,757 Days
• Field of Search: 381/320, 381/326, 381/328, 381/322, 181/135
• US Class Current: 381/322
• CPC Class Codes: H04R 23/008 using optical signals for detecting or generating sound
• CPC Class Codes: H04R 2460/09 Non-occlusive ear tips, i.e. leaving the ear canal open, for both custom and non-custom tips H04R2460/11 takes precedence
• CPC Class Codes: H04R 2460/13 Hearing devices using bone conduction transducers
• CPC Class Codes: H04R 25/40 Arrangements for obtaining a desired directivity characteristic
• CPC Class Codes: H04R 25/402 using contructional means
• CPC Class Codes: H04R 25/453 electronically
• CPC Class Codes: H04R 25/554 using a wireless connection, e.g. between microphone and amplifier or using Tcoils
• 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
• CPC Class Codes: H04R 3/04 for correcting frequency response

Abstract

A hearing system comprises a shell having an open inner chamber. An input transducer and a transmitter assembly are disposed in the open inner chamber. The transmitter has a frequency response bandwidth in a 6 kHz to 20 kHz range, and the open chamber has an end adjacent a patient'"'"'s tympanic membrane with one or more openings that allow the ambient sound to pass through the chamber and directly reach the middle ear of the user.

Claims

1. A hearing system comprising:

a shell having an outer surface and an open inner chamber, said outer surface configured to conform to an inner wall surface of the ear canal;

an input transducer disposed inside of the shell, wherein said input transducer captures ambient sound, including high frequency spatial localization cues, that enters the ear canal of the user and converts the captured sound into electrical signals; and

a transmitter assembly that receives the electrical signals from the input transducer, the transmitter assembly comprising a signal processor that has a frequency response bandwidth in a 6.0 kHz to 20 kHz range, the transmitter assembly configured to deliver filtered signals to an output transducer positioned in a middle or inner ear of the user, the filtered signals being representative of the ambient sound received by the input transducer,

wherein openings in the shell allow ambient sound to pass through the open chamber and bypass the input transducer to directly reach the middle ear of the user; and

wherein the open chamber of the shell houses at least a portion of the transmitter assembly, and the shell comprises a first end that is configured to be positioned adjacent to an entrance of the ear canal and a second end that is configured to be positioned in proximity to the tympanic membrane, wherein the second end comprises one or more of said openings that allow the ambient sound from outside the entrance of the ear canal to directly reach the middle or inner ear of the user.

2. The hearing system of claim 1 wherein the frequency response bandwidth allows for delivery of high-frequency localization cues in a 7 kHz to 13 kHz range to the middle ear of the user.

3. The hearing system of claim 1, wherein the input transducer is positioned at a first end of the shell.

4. The hearing system of claim 1 wherein the transmitter assembly comprises an acoustic transmitter.

5. The hearing system of claim 1 wherein the transmitter assembly comprises a fluid pressure transmitter.

6. The hearing system of claim 1, wherein the transmitter assembly comprises an optical transmitter.

7. The hearing system of claim 1 wherein the transmitter assembly comprises an electromagnetic transmitter and transmission element that receive a signal from the signal processor, the electromagnetic transmitter delivering the filtered signals to the output transducer through the transmission element.

8. The hearing system of claim 7 wherein the signal processor, electromagnetic transmitter and transmission element are disposed within the ear canal of the user.

9. The hearing system of claim 7 wherein the signal processor is located behind a pinna of the user and the electromagnetic transmitter and transmission element are disposed within the ear canal of the user.

10. The hearing system of claim 7 the output transducer is coupled to an acoustic member of the middle ear, the transducer being configured to receive the filtered signals from the transmission element.

11. The hearing system of claim 10 wherein the transducer comprises a permanent magnet.

12. The hearing system of claim 10 wherein the filtered signals are in the form of a modulated electromagnetic field.

13. The hearing system of claim 12 wherein the transducer is coupled to a tympanic membrane of the user.

14. The hearing system of claim 13 wherein the transducer is embedded in a conically shaped film that is configured to releasably contact a surface of the tympanic membrane.

15. A method comprising:

positioning a shell within an open ear canal of a user to capture ambient sound,said shell having an outer surface which conforms to an inner wall of the ear canal;

transmitting signals that are indicative of the ambient sound received by an input transducer within an open chamber of the shell to a transmitter assembly;

filtering the signals at the transmitter assembly with a signal processor that has bandwidth that is above about 6.0 kHz; and

delivering filtered signals to a middle ear or inner ear of the user;

wherein the open chamber inside the shell allows non-filtered ambient sound to bypass the input transducer and directly reach the middle ear of the user; and

wherein the open chamber of the shell houses at least a portion of the transmitter assembly, and the shell comprises a first end that is configured to be positioned adjacent to an entrance of the ear canal and a second end that is configured to be positioned in proximity to the tympanic membrane, wherein the second end comprises one or more of said openings that allow the ambient sound from outside the entrance of the ear canal to directly reach the middle or inner ear of the user.

16. The method of claim 15 wherein the signal processor has a bandwidth between about 6 kHz and about 20 kHz.

17. The method of claim 15 wherein the filtered signals comprise high-frequency spatial localization cues.

18. The method of claim 15 comprising positioning the signal processor, electromagnetic transmitter, and the transmission element in the ear canal.

19. The method of claim 15 wherein the positioning of the input transducer and transmitter assembly reduces feedback and provides an improved signal to noise ratio of up to about 8 dB.

20. The method of claim 15 wherein a transmitter assembly comprising an electromagnetic transmitter and a transmission element in communication with a signal processor is disposed with the shell, wherein delivering filtered signals to the middle ear of the user comprises:

directing signals from the signal processor to the electromagnetic transmitter;

delivering filtered electromagnetic signals from the electromagnetic transmitter to the middle ear through the transmission element.

21. The method of claim 20 comprising coupling a transducer to a tympanic membrane of the user,

wherein delivering filtered electromagnetic signals from the electromagnetic transmitter to the middle ear through the transmission element is carried out by delivering the filtered electromagnetic signals to the transducer which is mechanically vibrated according to the filtered electromagnetic signals.

22. The method of claim 20 comprising positioning the electromagnetic transmitter and the transmission element in the ear canal and positioning the signal processor outside of the ear canal.

23. The method of claim 20 wherein delivering filtered signals comprises delivering filtered optical signals.

24. The method of claim 20 wherein delivering filtered signals comprises delivering filtered acoustic signals.