Magnetic ossicular replacement prosthesis

• US 4,817,607 A
• Filed: 05/15/1987
• Issued: 04/04/1989
• Est. Priority Date: 03/07/1986
• Status: Expired due to Term

• Current Assignee: Gyrus ACMI, Inc. (Olympus Corporation)
• Original Assignee: Richards Medical Company
• Inventors: Tatge, Gary
• Primary Examiner(s): Jaworski, Francis
• Assistant Examiner(s): MANUEL, GEORGE C
• Application Number:
  US07/050,909
• Time in Patent Office: 690 Days
• Field of Search: 128/420.5, 128/420.6, 128/1 R, 128/92 C, 128/419, 623/9, 623/10, 623/11, 623/12
• US Class Current: 623/10
• CPC Class Codes: A61F 2002/183 Ear parts
• 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 ossicular replacement prosthesis containing a magnet in the head of the prosthesis so that when used with a magnetic induction hearing aid having a coil producing a magnetic field, the hearing losses resulting from insertion of the prosthesis and any other remaining hearing losses can be corrected without the difficulties associated with conventional acoustic hearing aids.

Claims

1. A middle ear ossicular replacement prosthesis for replacing at least a portion of the ossicular chain by making contact with two separated locations in the middle ear and for use with a hearing aid producing a magnetic field corresponding to sound waves received by the wearer, comprising:

a head portion adapted for contacting the tympanic membrane, said head portion including a magnet; and

a shaft portion adapted to extend from said head portion to a location in the middle ear,

wherein said head portion and said shaft portion are adapted to transmit to the inner ear the acoustically induced vibrations of the tympanic membrane received by said head portion and the magnetically induced vibrations developed by the coupling of the magnetic field produced by said magnet and the magnetic field produced by the hearing aid.

2. The prosthesis of claim 1, further comprising:

a pivotable joint connecting said head portion to said shaft portion.

3. The prosthesis of claim 1, wherein said shaft portion includes a magnet.

4. The prosthesis of claim 1, wherein said shaft portion is coaxial with said head portion.

5. The prosthesis of claim 1, wherein said shaft portion axis is parallel with the axis of said head portion.

6. The prosthesis of claim 1, wherein said shaft portion is hollow.

7. The prosthesis of claim 1, wherein said head portion is generally cylindrical.

8. The prosthesis of claim 1, wherein said magnet is generally cylindrical.

9. The prosthesis of claim 1, wherein said magnet is generally toroidal.

10. The prosthesis of claim 1, wherein said shaft portion and said head portion include a core encased within said shaft portion and said head portion, said core including an elongated core shaft aligned substantially concentric within said shaft portion and further including a first end forming an enlarged and substantially flat head positioned within and substantially concentric within said head portion, said shaft portion and said core being permanently bendable to allow said prosthesis to be permanently bent to a specific shape during implantation thereof to conform to the person'"'"'s middle ear structure, said core being stationary with respect to said head portion and said shaft portion.

11. The prosthesis of claim 1, wherein said head portion is a magnet.

12. The prosthesis of claim 11, wherein said magnet is coated with a bicompatible material.