Contactless transducer stimulation and sensing of ossicular chain

• US 5,842,967 A
• Filed: 08/07/1996
• Issued: 12/01/1998
• Est. Priority Date: 08/07/1996
• Status: Expired due to Term

• Current Assignee: Envoy Medical Corporation, Saint Croix Medical, Inc.
• Original Assignee: St Croix Medical Incorporated
• Inventors: Kroll, Kai
• Primary Examiner(s): Lacyk, John P.
• Assistant Examiner(s): Kearney, Rosiland
• Application Number:
  US08/693,454
• Time in Patent Office: 846 Days
• Field of Search: 623/10, 600/25, 607/55-57, 381/68, 381/68.3, 381/69, 181/128, 181/129
• US Class Current: 600/25
• 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

An implantable hearing aid system for the middle ear utilizes pairs of permanent magnets to engage transducers with auditory elements in a middle ear. At least one transducer is supported within the middle ear cavity by a support. A transducer is magnetically-engaged with a malleus in one embodiment and another transducer is magnetically-engaged with a stapes in other embodiments. When using two contactless transducers, a permanent magnet is attached to each transducer. A permanent magnet is also attached to the malleus and to the stapes. The permanent magnet on each transducer is situated such that its polarity acts in repulsion to the permanent magnet on the adjacent auditory element.

Claims

1. A method for assisting hearing, the method comprising the steps of:

(a) affixing a first permanent magnet to a transducer;

(b) affixing a second permanent magnet to a first auditory element in a middle ear,

(c) magnetically engaging the first and second permanent magnets;

(d) affixing a third permanent magnet to a second transducer;

(e) affixing a fourth permanent magnet to a second auditory element in the middle ear; and

(f) magnetically engaging the third and fourth permanent magnets.

2. The method of claim 1, in which affixing the second permanent magnet to the first auditory element includes affixing the second permanent magnet to a malleus, and affixing the first permanent magnet to the first transducer comprises affixing the first permanent magnet to a sensing transducer, and affixing the fourth permanent magnet to the second auditory element includes affixing the fourth permanent magnet to a stapes, and affixing the third permanent magnet to the second transducer comprises affixing the third permanent magnet to a stimulating transducer.

3. The method of claim 1, in which at least one of the steps of affixing the first and third permanent magnets includes affixing to a piezoelectric transducer.

4. The method of claim 1, further comprising the step of encasing at least one of the first, second, third, and fourth permanent magnets in at least one biocompatible case.

5. The method of claim 1, in which magnetically engaging the third and fourth permanent magnets includes providing a force of approximately 10 dynes against the second auditory element.

6. A transducer system for an at least partially implantable hearing device, the transducer system comprising:

a first transducer;

a first permanent magnet affixed to the first transducer; and

a second permanent magnet, adapted to be magnetically coupled to the first permanent magnet and also adapted to be affixed to a first auditory element in a middle ear wherein the auditory element is a malleus and said first transducer comprises a sensing transducer.

7. An at least partially implantable hearing assistance system comprising:

an electronics unit;

a first transducer, electrically coupled to the electronics unit;

a first permanent magnet affixed to the first transducer;

a second permanent magnet, adapted to be magnetically coupled to the first permanent magnet and also adapted to be affixed to a first auditory element in a middle ear;

a second transducer, electrically coupled to the electronics unit;

a third permanent magnet affixed to the second transducer; and

a fourth permanent magnet, adapted to be magnetically coupled to the third permanent magnet and also adapted to be affixed to a second auditory element in the middle ear.

8. The system of claim 7, wherein the first transducer is a sensing transducer and the second transducer is a stimulating transducer.