Patent Grant
9451373
The invention is related to the field of hearing aids, more specifically to hearing aids sealing the bony part of an external ear canal and the comfort of inserting and wearing them.
Comfortable insertion and safe fixation of an acoustically active part (end portion of a hearing aid tube through which the sound exits) of a bony seal hearing aid is crucial for customer acceptance. Prior art bony seal hearing aids comprise dome portions made of materials such as memory foam, silicon or alike to keep an acoustically active part in place while sealing the external ear canal. It has been observed that such materials, especially if worn on a long term basis, may cause skin irritations in the external ear canal of a user.
An arrangement keeping an acoustically active part of a hearing aid in place is disclosed in DE 102 36 134 C1, namely a hearing aid comprising an implanted acoustic duct extending from behind the ear into the external ear canal of a user, wherein the hearing aid is connected to the acoustic canal via an adapter located behind the ear. With an acoustic duct implanted and requiring an adapter to be placed behind the ear, said arrangement lacks comfort in wear.
A hearing aid enclosed in an ear mold and including an acoustic tube located at its inner end is disclosed in DE 199 43 809 A1. The acoustic tube being connected to an extending component occupying a volume towards the eardrum adapted to shape the acoustic proportions of the hearing aid, the arrangement is not suitable for safely fixing the acoustically active part to the external ear canal.
It is therefore an object of the present invention to provide a means which allows comfortable insertion and safe fixation of an acoustically active bony seal hearing aid.
According to a first aspect of the present invention, the technical objective is achieved by a hearing aid fixture which is adapted to remain firmly and completely within an external ear canal of a user allowing for an acoustically active part of a hearing aid to be releasably fastened thereto.
The inventive hearing aid fixture allows for an acoustically active part of a hearing aid to be inserted into an external ear canal comfortably by avoiding dome portions made of skin irritating materials. Since the hearing aid fixture remains firmly within the external ear canal, so does the acoustically active part attached thereto. When fastened to the hearing aid fixture the acoustically active part resides within the external ear canal without any direct contact to the external ear canal.
Adapted to remain firmly connotes that the hearing aid fixture is fitted into an external ear canal of a user such that it remains in position when an acoustically active part of a hearing aid which is releasably fastened thereto, is unfastened, i.e. pulled out of the external ear canal of the user.
In a preferred embodiment the hearing aid fixture comprises an ear canal abutting surface defining a first mechanical interface providing for a retaining force between the hearing aid fixture and an ear canal when the hearing aid fixture is inserted in the ear canal. The hearing aid fixture further comprises a second mechanical interface adapted to connect to an acoustically active part of a hearing aid and providing a connection force between an acoustically active part of a hearing aid and the hearing aid fixture. The retaining force is higher than the connection force.
In a preferred embodiment, to prevent ambient noise from reaching the eardrum, the hearing aid fixture but for a comprised auditory duct seals the external ear canal entirely. The hearing aid fixture can be adapted to seal the external ear canal entirely if an acoustically active part of a hearing aid is fastened thereto. The hearing aid fixture can be shaped in a manner of a hollow cylinder with the auditory duct being the inner cylinder.
Preferably, the auditory duct is designed to allow sound from an acoustically active part to reach the ear drum. To further improve sound transfer through the hearing aid fixture, the auditory duct can be adapted to accommodate a protruding portion of an acoustically active part of a hearing aid. The auditory duct can extend centrally through the hearing aid fixture along an axis of insertion to prevent misplacement of an acoustically active part to be attached.
In a preferred embodiment the hearing aid fixture is adapted to allow for an acoustically active part of a hearing aid to be magnetically fastened thereto. This prevents abrasion from both the hearing aid fixture and the acoustically active part. The respective magnetic components can be placed at the fixture and/or the acoustically active part such that the magnetic fastening is self-centering, that means that when inserted the acoustically active part is guided toward an optimal position.
In a further preferred embodiment the hearing aid fixture comprises a slit. The slit is formed as part of the auditory duct. The slit extends from a front face portion to an end face portion and/or along an ear canal abutting surface of the hearing aid fixture. The slit is provided in the hearing aid fixture such that the hearing aid fixture can resiliently extend in diameter to provide entry for an acoustically active part of a hearing aid. When in position the hearing aid fixture returning to its original diameter can provide for a mechanical locking. To provide a simple and robust mechanism, the mechanical locking is preferably of force fitting nature.
The slit can be provided in the hearing aid fixture such so as to allow for the hearing aid fixture to be resiliently squeezed from a firmly fitting diameter to a lesser diameter to simplify insertion of the hearing aid fixture. Such simplified insertion causes lesser skin pressure in the external ear canal.
To prevent debris entering the hearing aid fixture through said slit, the hearing aid fixture can comprises a plate covering the slit in the directing of insertion. The plate can be attachable to or formed as part of an acoustically active part of a hearing aid. In a preferred embodiment the plate is adapted to span a cross section of an external ear canal lying perpendicular to the direction of insertion. Thereby additional sealing of the auditory duct is achieved.
To be even more subtle to allow being placed close to the ear drum the length of the hearing aid fixture in the direction of insertion can be less than its diameter perpendicular to the direction of insertion.
In a preferred embodiment the hearing aid fixture is made of a shape-retaining material. This allows for the ear canal of a user to adapt more easily to the hearing aid fixture to be worn on a long term basis. At least ear canal abutting surface of the hearing aid fixture in physical contact with the external ear canal of a user can be made of or coated with a biocompatible material (material with high skin tolerance), such as titanium or alike. This allows for the hearing aid to remain in the ear canal for weeks or month or even permanently. This is true for the hearing aid fixture with or without the acoustically active part fastened thereto.
In a further preferred embodiment, to reduce a customizing effort, the hearing aid fixture is chosen from a range of pre-manufactured sizes as to fit firmly and completely within an external ear canal of a user.
According to a second aspect of the present invention, the technical object is achieved by a hearing aid assembly comprising a hearing aid fixture and an acoustically active part of a hearing aid releasably fastened thereto. It is to be understood that the embodiments and advantages described with respect to the first aspect of the present invention are comprised by the second aspect of the invention as well.
A hearing aid fixture 1 in
A hearing aid fixture 1 in
| Number | Date | Country | Kind |
|---|---|---|---|
| 11189534 | Nov 2011 | EP | regional |
This nonprovisional application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Application No. 61/560,821 filed on Nov. 17, 2011 and under 35 U.S.C. §119(a) of patent application Ser. No. 11189534.8 filed in Europe on Nov. 17, 201. The entire content of all of the above applications is hereby incorporated by reference.
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