Trans-tympanic connector for magnetic induction hearing aid

• US 5,220,918 A
• Filed: 05/15/1991
• Issued: 06/22/1993
• Est. Priority Date: 11/16/1988
• Status: Expired due to Fees

• Current Assignee: Smith & Nephew Richards Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Richards Incorporated (Smith & Nephew PLC)
• Inventors: Heide, Jorgen, Prescott, Anthony D.
• Primary Examiner(s): Shay, David M.
• Application Number:
  US07/702,369
• Time in Patent Office: 769 Days
• Field of Search: 623/10, 623/11, 623/16, 128/420.6
• US Class Current: 600/25
• CPC Class Codes: A61F 2/18 Internal ear or nose parts, e.g. ear-drums implants for middle ear ventilation or drainage A61F11/202
• CPC Class Codes: A61F 2002/183 Ear parts
• CPC Class Codes: H04R 2225/023 Completely in the canal [CIC] hearing aids
• 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

Abstract

The specification discloses a trans-tympanic rod having a magnet at one end, and connected at the opposite end to a location in the middle ear, for transmitting the vibrations induced in the magnet by a magnetic induction hearing aid, to the inner ear. The rod can mate with the malleus by way of a set of prongs or by insertion in a hole in the malleus. Alternately, the rod can mate with a hole in an ossicular replacement prosthesis. Additionally, the rod can mate with a horseshoe shaped prosthesis located between the tympanic membrane and the malleus.

Claims

1. A connector for connecting the magnet used with a magnetic induction hearing aid to the middle ear, comprising:

a shaft including means formed of a rigid, biocompatible material shaped and dimensioned to pass through an opening formed in a tympanic membrane portion of an ear, said shaft being of a length such that a first end can be located in the ear canal and a second end in the middle ear;

means on said shaft and connected to said first end of said shaft for allowing the magnet to be easily connected to, removed from and reconnected to said first end of said shaft so that the magnet is located in the ear canal when connected to said shaft; and

means for connecting the second end of the shaft to a location in the middle ear to transmit vibrations from the magnet to the inner ear.

2. The connector of claim 1, wherein said means for allowing the magnet to be connected, removed and reconnected includes an elastomeric material coating the shaft.

3. The connector of claim 1, wherein said second end of said shaft includes two separate and parallel prongs projecting from said second end normal to the longitudinal axis of said shaft, the separation of said prongs being slightly larger than the average diameter of the malleus at the point of connection, allowing said second end to attach to and partially surround a portion of the malleus handle. PG,16

4. A connector for connecting the magnet used with a magnetic induction hearing aid to the middle ear, the magnet having a blind hole, comprising:

a shaft including means formed of a rigid, biocompatible material shaped and dimensioned to pass through an opening formed in a tympanic membrane portion of an ear, said shaft being of a length such that a first end can be located in the ear canal and a second end in the middle ear;

means on said shaft and connected to said first end of said shaft for allowing the magnet to be easily connected to, removed from and reconnected to said first end of said shaft so that the magnet is located in the ear canal when connected to said shaft, said means for allowing the magnet to be connected, removed and reconnected including a shaft portion sized and shaped to be correspondingly similar to and to mate with the blind hole,

means for connecting the second end of the shaft to a location in the middle ear to transmit vibrations from the magnet to the inner ear.

5. The connector of claim 4, wherein said means for allowing the magnet to be connected, removed and reconnected includes an elastomeric material coating said shaft portion.

6. The connector of claim 4, wherein said second end of said shaft includes two separate and parallel prongs projecting from said second end normal to the longitudinal axis of said shaft, the separation of said prongs being slightly larger than the average diameter of the malleus at the point of connection, allowing said second end to attach to and partially surround a portion of the malleus handle.

7. The connector of claim 4, wherein when a hole has been formed in the malleus, said second end of said shaft is sized and shaped to lodge tightly in the hole in the malleus.

8. The connector of claim 7, wherein said shaft includes a circumferential flange located a distance from said second end to prevent further insertion of said end into the malleus.