Patent Grant
7443993
The present invention relates to a replaceable ear wax guard for placement in an opening in a wall part of a housing of an in-the-ear hearing aid designed for positioning in the ear canal, comprising an essentially tubular element partially closed in one end by an ear wax retaining barrier.
In in-the-ear hearing aids where the hearing aid housing is placed within the user's ear canal with the acoustic outlet port facing the inner ear and connected to the telephone unit of the hearing aid, it is a well-known problem that the acoustic outlet passage is exposed to contamination with cerumen or ear wax which may lead to clogging of the acoustic outlet passage with consequently reduced sound reproduction. At worst, there may be a risk for the ear wax to enter the hearing apparatus housing and result in damage to the electrical components of the hearing aid.
In order to avoid this problem, it is known from U.S. Pat. No. 4,972,488 to arrange a replaceable ear wax barrier, which can at the same time provide a dampening of the acoustic response, in the acoustic outlet passage in the apparatus housing. In this known design, the ear wax barrier is formed as a screw plug the arrangement of which presupposes a thread being provided in the acoustic outlet passage, and the ear wax barrier is in the end facing outward at the insertion by screwing, designed with incisions for providing a slot for a screw driver. The barrier effect for retaining of ear wax is obtained by providing inward projections in a through-going cavity in the screw plug.
As a consequence of the very small dimensions where the acoustic outlet passage has typically a diameter of about 1 mm, the screw plug form entails that insertion and removal of the ear wax guard is a rather difficult operation, especially for weak-sighted hearing aid users, and the inward projections forming a kind of maze in the through-going cavity do not provide full security against migration of ear wax. Furthermore, the screw plug design cannot be used in in-the-ear hearing aids of the conventional type where the acoustic outlet passage is formed by a short hose or tube member connecting the telephone unit with an acoustic output port in the wall of the hearing aid housing.
Furthermore, the international patent application WO 84/04016 discloses an ear wax guard in the form of an outwardly closed plug with a disc-shaped head which at the placement of the plug covers the acoustic outlet port of the aid housing. In the plug under the disc-shaped head, there are provided radial acoustic passageways in connection with a longitudinal acoustic passageway opening in the plug end introduced in the aid housing. To secure a sufficient acoustic passage, the plug is designed such that the disc-shaped head is kept at a distance from the outside of the aid housing which entails a risk, albeit reduced, of migration of ear wax under the plug and in the narrow radial acoustic passageways. As a consequence of the smooth disc-shaped head, the insertion and removal of the plug is also in this case a difficult operation.
In a hearing aid known from U.S. Pat. No. 4,553,627, an essentially mushroom-shaped ear wax guard with a crossing acoustic passage is mounted with snap engagement in a metal ring inserted in the acoustic outlet port of the hearing aid housing.
In published European application EP 0724 377 A1, an ear wax barrier of the kind defined above is disclosed, which is inserted by press-fitting in the receiver tube of a hearing aid with frictional engagement between a lip provided by the wax barrier and the receiver tube. Thereby, removal or dislodging of the wax barrier will be resisted. Whereas the operation of removal is not described in the document the only possibility would appear to seize a projecting collar formed at the distal end of the wax barrier by a suitable instrument, such as a knife, a tongue or a pair of tweezers.
With this prior art as background, it is the object of the invention to provide a replaceable ear wax guard of the stated type with a simple and low-cost design suited for all kinds of in-the-ear hearing aids and which by use of an applicator can be mounted in and removed from the aid housing in a simple way.
For this purpose, the ear wax guard according to the invention is characterized in that the tubular element provides an essentially circular cylindrical through-going cavity with a smooth inner side and is connected in the opposite end to a surrounding abutment collar forming, in the position of use of the ear wax guard, a sealing lip against said wall part around said opening, the tubular element being made by an elastically yielding material which, by introduction of an applicator into the tubular element, is engageable by a catch member of said applicator for removal of the ear wax guard from an acoustic outlet port or vent formed by said opening.
As a consequence of the simple design as a short tubular element with a surrounding abutment collar in the end facing inward at the insertion, the ear wax guard according to the invention is inexpensive to manufacture in a large number by molding of the elastically yielding material, which can typically be silicone rubber or a thermoplastic elastomer. A further contribution to this is the positioning of the ear wax retaining barrier in one end of the tubular element which when introduced is led into the acoustic outlet canal. The merely partial opening of this end of the tubular element can be obtained by designing the guard as a kind of screen and thus can assure a good sound transmission.
Advantageous features and embodiments of the ear wax guard are described below. In a particularly advantageous embodiment, in particular for use in connection with CIC hearing aids, the abutment collar is provided with a convex outside and a concave or faintly conical underside to provide said sealing lip at its peripheral edge. Thus, the user comfort is improved as the ear wax guard essentially follows the outer contour of the aid housing.
As a consequence of the sealing engagement of the abutment collar of the ear wax barrier against the hearing aid housing, the abutment collar, which can preferably be provided with a relatively thin and soft edge, fitting snugly to the surrounding outside of the housing with a very even transition, it is avoided that when inserting or removing the hearing aid, the abutment collar causes any inconvenience or damage to the ear canal.
As the removal of the wax barrier of the invention by seizing the edge of the abutment collar in a conventional way as known, e.g., from U.S. Pat. No. 4,553,627, is not possible, the invention further relates to an applicator for placement and replacement of the ear wax guard in an opening in a wall part of a housing of an in-the-ear hearing aid designed for positioning in the ear canal, comprising an essentially rod-shaped member provided in one end with first engaging means fitting into the tubular element of the ear wax guard for insertion of the ear wax guard and, in the opposite end, with second engaging means for removal of the ear wax guard.
In a prior art design of a similar applicator disclosed in U.S. Pat. No. 4,972,488, the first engaging means is formed with projecting fins engageable with recessed slots in the inner side of the tubular element of the wax guard, whereas the second engaging means projecting members with fins engageable with the projecting collar of the wax guard.
According to the invention, such an applicator is characterized in that said first engaging means comprises a smooth pin fitting into the smooth wall inner side of the tubular element of the ear wax guard, whereas said second engaging means comprises a catch member engageable with the elastically yielding material of the tubular element at said smooth wall inner side by introduction of said opposite end of the applicator into the tubular element.
By this applicator design, the insertion of the ear wax guard in the acoustic outlet port and the removal herefrom in connection with the replacement of the ear wax guard can be made in a simple way and with a high degree of security even by weak-sighted users, the different design of the two ends of the applicator for insertion and removal, respectively, contributing to the easy operation.
Advantageous embodiments of the applicator are also described below and in the appended claims. Thus, according to a preferred embodiment, the essentially cylindrical and wedge-shaped portion of the applicator is separated by an intermediate piece with a cross section larger than said portion, and a magnifying lens having a bore is provided for attachment on said cylindrical or said wedge-shaped applicator portion in abutment against said intermediate piece.
By itself, the use of a magnifying lens in combination with a conventional screwdriver is known from French patent publication FR 2 347 158.
Thus, a further improvement of the operating security is obtained, especially for weak-sighted hearing aid users.
As from consideration of the visibility of the through-going cavity of the ear wax guard and the risk of pressing ear wax accumulated in the ear wax guard out through the ear wax retaining barrier at introduction of the applicator in the ear wax guard in connection with the removal hereof, the catch member may not cover a too large area, the use of the applicator, especially in ITE hearing aids where the acoustic outlet canal is designed as a hose or tube member guided from the output transducer of the aid all the way through to the acoustic outlet port in the wall of the housing, will entail a certain risk that such a hose or tube member and perhaps the ear wax guard itself at the pressing-in of the catch member is pressed into the hearing aid housing.
To encounter this risk, the invention relates in addition to a particularly designed in-the-ear hearing aid with a housing provided for positioning in the ear canal and having an essentially shell-shaped wall, in which in an end part meant for placement inside the ear canal an opening is provided to form an acoustic outlet port in connection with one end of hose or tube member serving as acoustic outlet canal, the other end of which is retained in an outlet port from an outlet transducer arranged in the housing or optionally a vent.
To obtain an improved security against the hose or tube member serving as acoustic outlet canal at the mounting or replacement of the ear wax guard being detached from its connection with the acoustic outlet port in the end part of the housing wall and pressed into the housing, the hearing aid according to the invention is characterized in that to permit placement and replacement of an ear wax guard as defined above by use of an applicator as likewise defined above without affecting the hose or tube member, said opening is provided in an annular abutment collar arranged in abutment with the outside of said wall end part. Appropriate embodiments of such a hearing aid are further described below.
Since the housing for in-the-ear hearing aids of the stated kind is usually designed with an individually adapted form according to the actual user's ear canal, the invention further relates to a method for manufacture of a hearing aid of the stated type which permits a production of the abutment collar for mounting of the ear wax guard in a standard design independent of the individual user adaptation of the form of the housing.
According to the invention, this method is characterized by the use of an abutment collar having overdimensions with respect to said end part of the housing wall, and that a flush transition of the abutment collar with the outside of said end part is provided by preparation of the peripheral edge of the abutment collar.
The invention is further explained in the following with reference to the schematical drawings, wherein
The embodiment shown in
A through-going also essentially circular cylindrical cavity 8 in the tubular element 7 is in one end, which by insertion in the acoustic outlet canal 4 is led into this, partially closed by an ear wax retaining barrier 9 which as shown in
In the opposite end the tubular element 7 is surrounded by an abutment collar 11 which in the inserted position is brought into sealing abutment against the end wall part 5 around the acoustic outlet port 4a. In the shown embodiment the abutment collar 11 has a convex outside and a concave or faintly conical underside, the peripheral edge of the collar forming a relatively thin and soft sealing lip 12 against the end wall part 5. Thus, a high degree of security is obtained against migration of ear wax under the periphery edge of the collar and the ear wax guard will in inserted position follow the contour of the aid housing which is of considerable importance as to comfort, especially at so called CIC aid which are placed in the innermost sensitive part of the ear canal.
The ear wax guard 6 is manufactured of elastic yielding material as e.g. silicone rubber or a thermoplastic elastomer and typical with an outer diameter of 1.25-1.5 mm and an inner diameter of the cavity 8 of about 1 mm.
For an improved securing of the ear wax guard 6 in the acoustic outlet canal 4, the tubular element 6 can on the outside be provided with means for frictional engagement, e. g. in the form of at least one circumferential bead 13.
An ear wax guard as shown and described can be placed not only in the acoustic outlet port of the hearing aid housing, but also in an opening facing the inner of the ear canal, in the hearing aid housing for a vent passage, which may have the purpose of preventing or reducing so called occlusion effects.
A means for use at insertion and removal of the ear wax guard 6 in
At the free end of the circular cylindrical portion 15, the applicator 14 is provided with a smooth circular cylindrical pin 23 for insertion in the inner cavity 8 of the ear wax guard 6 in connection with the insertion of the ear wax guard in the acoustic outlet port 4. In the opposite end, the applicator 14 is provided with a harpoon-shaped pressing-in peak 24 projecting from the end edge surface 19 which with catch edges 25 forms a catch member for engagement with the wall inner side of the tubular element 7 of the ear wax guard 6 around the cavity 8 in connection with removal of the ear wax guard.
Corresponding to the flat rectangular form of the end edge surface 19, the pressing-in peak 24 is formed as a four-sided pyramid with a flat rectangular base. The pressing-in peak 24 is dimensioned such that the long side in the base is larger than the diameter of the through-going cavity 8 of the ear wax guard, the pressing depth being limited so that the pressing-in peak 24 is prevented from being pressed too far into the cavity 8 such that the ear wax accumulated in the ear wax guard 6 is not pressed through the guard 9 and into the aid housing. 1.
As a consequence of the small dimensions, it is appropriate especially for weak-sighted hearing aid users, if the insertion and removal means comprises an enlargement lens designed to be positioned on the actually used end portion 15 or 16 of the applicator 14.
In a simple embodiment, such an enlargement lens can as shown in
In order to avoid that the end portion 15 or 16 of the applicator 14 extended under the lens during insertion or removal covers the wanted visual field, a bore 28 provided for the attachment of the lens on the applicator 14, as shown in
When inserting the ear wax guard, this is placed as shown in
When a quantity of ear wax has been accumulated in the ear wax guard entailing a significant reduction of the sound reproduction of the hearing aid, the ear wax guard can as shown in
In the embodiment shown in
The annular abutment collar 33 and the bushing 32 provide a cylindrical bore for mounting the ear wax guard 36 which can be effected with a means in the form of a rod-shaped applicator as described above with reference to
The periphery edge 37 of the abutment collar 33 is as shown preferably prepared such that a flush transition is obtained between the abutment collar and surrounding outside of the end wall part 35.
By means of the abutment collar 33 which in the shown embodiment is in fixed connection with the hose member 34 through the bushing 32, there is obtained a considerably improved security against unintentional detachment of the hose member 34 from the acoustic outlet port 34a at the mounting or replacement of the ear wax guard 36 by means of an applicator as shown in
In the modification of this hearing aid design shown in
Since the hearing aid housing for in-the-ear hearing aids is usually designed with individual adaptation to the form of the actual user's ear canal, it is in
As shown in
Alternatively as shown in
As shown in
The ready-mounted hearing aid housing 61 with the abutment collar 33 or 53 in abutment against the outside of the end part 65 of the hearing aid housing 61 is shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| 1998 00921 | Jul 1998 | DK | national |
This is a divisional of U.S. application Ser. No. 09/743,316 filed Jan. 9, 2001 now U.S. Pat. No. 6,795,562, which is a national stage entry of PCT/DK99/00022 filed Jan. 15, 1999, both of which are incorporated by reference herein.
| Number | Name | Date | Kind |
|---|---|---|---|
| 2266874 | Larson | Dec 1941 | A |
| 4553627 | Gastmeier et al. | Nov 1985 | A |
| 4972488 | Weiss et al. | Nov 1990 | A |
| 5209757 | Krug et al. | May 1993 | A |
| 5887070 | Iseberg et al. | Mar 1999 | A |
| 6000492 | Puthuff et al. | Dec 1999 | A |
| 6164409 | Berger | Dec 2000 | A |
| 6205227 | Mahoney et al. | Mar 2001 | B1 |
| Number | Date | Country |
|---|---|---|
| 36 03 704 | Aug 1987 | DE |
| 36 16 637 | Nov 1987 | DE |
| 42 32 317 | May 1993 | DE |
| 0 724 377 | Jul 1996 | EP |
| 2 347 158 | Nov 1977 | FR |
| WO 8404016 | Jan 1984 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 20050018867 A1 | Jan 2005 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 09743316 | US | |
| Child | 10926005 | US |
