Patent Description:
Within the area of hearing devices for people with hearing loss, many different types of hearing devices are available on the market. One example of a hearing device is disclosed in <CIT> and another one is disclosed in <CIT>.

Disadvantages of some known modern hearing devices, among others, are that they are prone to get soiled and grubby or even grimy as being used close to a body and during activities, such as training/practice, due to outdoor use and perspiration etc. Many of known modern hearing devices are also small so as not to be too visible and to be more discreet, hence, handling of these small hearing devices may be relatively complicated and they may be difficult to use and put on, in particular if the user is visually impaired and/or has some other disability, such as reduced handfunction that makes it more difficult for the user to use the hands, especially their fine motorics.

The present invention is disclosed by the subject-matter of the independent claim. An aspect of the present invention is a hearing device as defined in independent claim <NUM>. Further embodiments of the invention are the subject of the dependent claims. The embodiments that fall under the scope of the claims are described by the paragraphs related to <FIG> and <FIG>. References throughout this disclosure to other embodiments are not encompassed by the claims, but rather examples and technical descriptions useful for understanding the invention. The scope of present invention is defined by the claims.

One object of the invention is to provide a hearing device that enable easy change of its cover/-s, filter/-s (dirt/audio filter/-s or the like), and/or sealing/-s, which solves or at least reduces one or more of above problems.

Another object is to provide a hearing device that is easy to maintain, in particular to keep clean and with remained functionality by being configured for easy change of its cover/-s, filter/-s (dirt/audio filter/-s or the like), and/or sealing/-s, which solves or at least reduces one or more of above problems.

In one aspect, one or more of the above objects are achieved by means of a hearing device, as claimed in the associated independent claim, preferred variants thereof being defined in associated dependent claims.

According to the disclosure at least one of the objects are achieved by a hearing device comprising a hearing device housing having at least one microphone and a cover comprising at least one filter for covering an audio channel for channeling sound between the surroundings and the at least one microphone arranged in the hearing device housing, said hearing device housing comprising a control unit and a power source, the hearing device housing comprises a sealing for sealing the interior of the hearing device housing against damp, moist, dirt and dust for protection of the control unit and the power source, the control unit being operationely connected to the at least one microphone and the power source, the cover and the hearing device housing comprising complementary coupling parts for detachable connection such that said cover is exchangeable, wherein the hearing device housing is kept sealed when the cover is disconnected from it.

One advantage of such a hearing device is that its interior components within its housing being necessary for its function are tightly sealed, such as any of its mechanical and/or electronic functions being kept intact eliminating any jamming of any moving parts and/or interruption of electrical connections/short circuiting due to dirt, moist, water leakage or the like being hindered from entering the interior control "room" of the hearing device.

Further objects and features of the present invention will appear from the following definitions of aspects/embodiments of the invention together with their/its advantages.

According to the invention, the cover is exchangeable to another type of cover and/or the cover is exchangeable to another cover comprising another type of filter.

According to some embodiments, the cover and hearing device housing are configured for creating a space therebetween such that at least a part of the filter can be situated in the space created between cover and hearing device housing. According to some embodiments, at least a part of the filter is provided in a void in the cover. In some embodiments, at least a third of the volume of the filter is provided in a void in the cover and/or at least a third of the weight of the filter is provided in a void in the cover.

In some embodiments, the complementary coupling parts comprise snap coupling means configured for detachably connecting the cover and the hearing device housing and/or the complementary coupling parts comprise an exchangeable locking pin configured for detachably connecting the cover and the hearing device housing.

According to some embodiments, the complementary coupling parts are configured for engaging an exchangeable locking pin configured for detachably connecting said cover and said hearing device housing by engaging and locking into the complementary coupling parts. According to some embodiments, the cover comprises first complementary coupling parts and/or the hearing device housing comprises second complementary coupling parts.

In some embodiments, the cover comprises flanges/sides/walls configured for fitting to the hearing device housing such that at least a part of the hearing device housing can be enclosed by said flanges/sides/walls. In some embodiments, the hearing device housing comprises flanges/sides/walls configured for fitting to the cover such that at least a part of the cover can be enclosed by said flanges/sides/walls. In some embodiments, a sealing is provided for watertight connection between the cover and the hearing device housing. According to some embodiments, the sealing comprises silicone.

According to some embodiments, the hearing device housing comprises holes configured for alignment with similar holes provided in the cover such that said cover is able to be detachably locked with said hearing device housing by means of an exchangeable locking pin configured for engaging and locking into the holes and/or the complementary coupling parts comprise holes situated in the flanges/sides/walls, said holes being configured for alignment with similar holes provided in the at least one enclosed part such that said cover is able to be detachably locked with said hearing device housing by enabling for an exchangeable locking pin to engage and lock into the holes.

In some embodiments, the holes and the exchangeable locking pin configured for detachably connecting said cover and said hearing device housing are made with a tolerance, such that the exchangeable locking pin is locked into at least one of the holes by a first friction force adapted to keep the locking pin in place during normal use of the hearing device. The locking pin is advantageously held in place without need of additional means for securing it in place, such as snap means, springs, glue or the like.

In some embodiments, the complementary coupling parts comprise at least two sets of different coupling parts, one part being a hook-like member and a thereto adapted member such that movement between the cover and hearing device housing is limited when connected by the one part, and a second part complementing the one part such that the cover is detachably fixated when the cover and hearing device housing is connected by both the one part and the second part. According to some embodiments, the cover comprises an user interface configured for controlling the power source of the hearing device for its operation. In some embodiments, the user interface is a button being movably connected to the cover such that the button is operatively connected to the hearing device and its power source when the cover is detachably connected to the hearing device housing. In some embodiments, the button is operatively connected to the hearing device and its power source via at least a part of the sealing of the hearing device housing. In some embodiments, the sealing of the hearing device housing is provided by a silicone membrane.

Further objects and features of the present invention will appear from the following definitions of aspects/examples/embodiments thereof.

The invention will be described in more detail with reference to the enclosed figures, which show examples of presently preferred embodiments of the invention.

In addition, an illustrated embodiment needs not have all the aspects and/or advantages shown.

A system <NUM> comprising at least one hearing device <NUM> and at least one tool <NUM> is shown in <FIG> and <FIG>. The hearing device <NUM> comprises a housing <NUM> having at least one sealing <NUM> and at least one detachable cover <NUM> having at least one exchangeable audio filter <NUM>. The separate tool <NUM> with handle is adapted for disconnecting the cover <NUM> from the housing <NUM> to enable changing cover and/or audio filter and/or sealing. The exchange is done if the cover is broken and/or too worn and/or need an upgrade and/or change of appearance, e.g. colour and/or shape and/or structure.

The hearing device <NUM> is shown in <FIG> as an example/embodiment of the invention. The hearing device <NUM> comprises the housing <NUM>, at least one microphone <NUM>, at least one audio channel <NUM> to guide sound to the microphone. The hearing device <NUM> comprises the at least one sealing <NUM>, a first coupling part <NUM> and a second coupling part <NUM> for detachable connection with corresponding or mating parts <NUM>, <NUM> of cover <NUM>. The hearing device <NUM> comprises a mating and/or upper and/or top interface or part and/or flange/-s/side/-s/wall/-s <NUM> at which the cover <NUM> is removably connected. The hearing device <NUM> comprises a lower or outer enclosure or part <NUM> facing away from its upper part <NUM>. The hearing device <NUM> comprises at least one locking hole <NUM> for detachable connection and alignment with one or more corresponding hole/-s <NUM> of cover <NUM> to enable a locking pin <NUM>, <NUM> to protrude therethrough. The complementary coupling parts <NUM>, <NUM>, <NUM>, <NUM> comprise snap coupling means configured for detachably connecting cover <NUM> and hearing device housing <NUM>. The complementary coupling parts <NUM>, <NUM>, <NUM>, <NUM> comprise the exchangeable locking pin <NUM>, <NUM> being configured for detachably connecting cover <NUM> and hearing device housing <NUM>. The complementary coupling parts <NUM>, <NUM>, <NUM>, <NUM> are configured for engaging the ex-changeable locking pin <NUM>, <NUM> that in turn is configured for detachably connecting cover <NUM> and hearing device housing <NUM> by engaging and locking into the complementary coupling parts. The holes <NUM> is inner holes of the hearing device <NUM>. The other holes <NUM> is situated closer to the outer/envelope surface of the hearing device <NUM>, i.e. its cover <NUM> and/or its housing <NUM>, and/or the other holes <NUM> are outer through holes and/or have orifices that the locking pin <NUM> firstly enter before entering the inner through holes <NUM> when pushed in. The complementary coupling parts <NUM>, <NUM>, <NUM>, <NUM> are configured to mate as a finger joint, almost intertwined, whereafter the holes <NUM> on/in first fingers and holes <NUM> on/in second fingers are aligned with a common through/protruding "line of sight" forming a hollow straight channel or through passage/bore such that the fixed pin <NUM> and lockings pins <NUM>, <NUM> are able to be pushed through and into/out of this through passage of holes <NUM>, <NUM> when a new locking pin <NUM> is assembled into the holes as a beam and the first locking pin <NUM> be pushed out of engagement with these holes and the passage when the first locking pin is detached/disassembled, i.e. the new locking pin <NUM> and the first pin <NUM> then changes place.

The holes <NUM> of hearing device housing <NUM> are configured for alignment with the similar cover holes <NUM> such that the cover is able to be detachably locked with the hearing device housing by means of the exchangeable locking pin <NUM>, <NUM> as being configured for engaging and detachably locking into the aligned holes <NUM>, <NUM> in both cover and housing when finally assembled together. The complementary coupling parts <NUM>, <NUM> of cover <NUM> comprise the holes <NUM> situated in the flanges/sides/walls <NUM> being configured for alignment with the similar holes <NUM> of the complementary coupling parts <NUM>, <NUM> of housing <NUM> provided in its at least one enclosed part such that the cover is able to be detachably locked with the hearing device housing by enabling the exchangeable locking pin <NUM>, <NUM> to engage and lock into all the aligned holes <NUM>, <NUM> by being pushed therethrough. The cover and housing holes <NUM>, <NUM> and each exchangeable locking pin <NUM>, <NUM> configured for detachably connecting the cover and the hearing device housing are made with a tolerance, such that each exchangeable locking pin is locked into at least one of the holes by a first friction force F<NUM> (see <FIG>) adapted to keep the locking pin in place during normal use of the hearing device <NUM> after assembly. The hearing device <NUM> comprises at least one power source <NUM>, e.g. a battery, for its operation.

The hearing device <NUM> comprises and is controlled by at least one controlling unit, e.g. via a knob or button <NUM> that is accessible from its exterior. The unit for controlling hearing device <NUM> is operatively connected to other components including the microphones <NUM> and battery <NUM>, such as electronics/electronic circuits and mechanical devices incl. electrical conduits etc. , however, these entities working together for the operation of the hearing device are possible to implement by use of many different types of components and parts being common knowledge for a skilled person and are therefore not explained in detail herein. The cover <NUM> comprises an user interface, e.g. the knob <NUM>, configured for controlling at least the power source <NUM> of the hearing device <NUM> for its operation. The user interface is a button <NUM> being movably and mechanically connected to cover <NUM> such that the button is operatively connected to the control electronics of hearing device <NUM> and its power source <NUM> when the cover is detachably connected to the hearing device housing <NUM> but could in other aspects be a touch sensitive button using the same technology as a touch screen. The button <NUM> is operatively connected to the control electronics of hearing device <NUM> and at least its power source <NUM> via at least a part of the sealing <NUM> of hearing device housing <NUM>.

The sealing <NUM> of the hearing device <NUM> is adapted for sealing the interior of the hearing device housing <NUM> against damp, moist, water or other liquids, dirt and dust for protection of control circuits, including control unit <NUM> and power source <NUM> and all other associated components necessary for operation of the hearing device <NUM>. The cover <NUM> and hearing device housing <NUM> comprise the complementary coupling parts <NUM>, <NUM>, <NUM>, <NUM> for detachable connection, such that the cover is exchangeable while keeping the hearing device housing <NUM> tightly sealed/watertight, when the cover is disconnected from it, but also when the cover is connected to the housing. The sealing <NUM> comprises silicone and/or is at least partly made of silicone and/or is provided by a silicone membrane.

Each microphone <NUM> works as an input transducer and the functionality of hearing device <NUM> is explained shortly here as its function is common knowledge for a skilled person. Each microphone <NUM> receives sound through an audio channel <NUM> and a filter <NUM> and outputs an analogue audio signal based on the acoustic sound signal arriving at the microphone when the hearing device <NUM> is operating. An analogue-to-digital converter converts the analogue audio signal into a corresponding digital audio signal for digital signal processing in the hearing circuit, such as a hearing loss processor that is configured to compensate a hearing loss of a user of the hearing device. Preferably, the hearing loss processor comprises a dynamic range compressor well-known in the art for compensation of frequency dependent loss of dynamic range of the user often termed recruitment in the art. In this way, the hearing device <NUM> may be configured to restore loudness, such that loudness of the hearing loss compensated signal as perceived by the user wearing the hearing device <NUM> substantially matches the loudness of the acoustic sound signal arriving at the microphone <NUM> as it would have been perceived by a listener with normal hearing. Accordingly, the hearing loss processor outputs a digital hearing loss compensated audio signal. A digital-to-analogue converter then converts the digital hearing loss compensated audio signal into a corresponding analogue hearing loss compensated audio signal. An output transducer in the form of a receiver converts the analogue hearing loss compensated audio signal into a corresponding acoustic signal for transmission via a loudspeaker or the like towards an eardrum of the user, whereby the user hears the sound originally arriving at the microphone, however, compensated for the user's individual hearing loss. The hearing loss processor is operatively coupled to the control unit and/or master unit and/or the knob <NUM> of hearing device <NUM> in a way being common knowledge to a skilled person, wherefore this functionality of the hearing device is not further explained herein.

The following examples/aspects/embodiments of the tool in <FIG> and <FIG> are not according to the invention and are present for illustration purposes only. The tool <NUM> is adapted for easy and quick exchange of a cover <NUM> with one or more filters <NUM> (audio filters or the like). This is enabled in that the cover <NUM> is detachable from the hearing device housing <NUM>, which also enables changing a sealing <NUM> if desired, after the cover is detached from the housing as this gives access to sealing <NUM> and/or filters <NUM>. The cover <NUM> comprises at least one void or cavity <NUM> for receiving and/or holding at least a part of or the whole filter <NUM>. The cover <NUM> comprises at least one flange or side or wall <NUM>. The cover <NUM> comprises at least one first coupling member <NUM> for detachable connection with the first coupling part <NUM> of housing <NUM> and at least one second coupling member <NUM> for detachable connection with the second coupling part <NUM> of housing <NUM>. The cover <NUM> comprises at least one locking hole <NUM> for detachable connection and alignment with one or more of the corresponding holes <NUM> of housing <NUM> by means of the locking pin <NUM>, <NUM> protruding therethrough. The cover <NUM> comprises the flanges and/or sides and/or walls <NUM> configured for fitting to the hearing device housing <NUM> such that at least a part of the flange/wall/side <NUM> of the hearing device housing can be enclosed by the flanges and/or sides and/or walls of cover <NUM> or hearing device housing <NUM> comprises one or more flanges and/or sides and/or walls <NUM> configured for fitting to cover <NUM> such that at least a part of cover/cover flange/side/wall <NUM> can be enclosed by a flange/side/wall <NUM> of housing <NUM>. In one aspect, the complementary hearing device coupling parts <NUM>, <NUM>, <NUM>, <NUM> comprise at least two sets of different coupling parts, one part being a hook-like member <NUM> (see <FIG>) and a thereto adapted member <NUM> so that movement between the cover <NUM> and the hearing device housing <NUM> is limited when connected by the one part, and a second part <NUM>, <NUM> complementing the one part <NUM>, <NUM> such that the cover is detachably fixated when cover and hearing device housing is connected by both the one part and the second part. The second part of the hearing device <NUM> comprising the coupling parts <NUM> and <NUM> is located at a first end 10A of the hearing device as seen in <FIG>. The one part of the hearing device <NUM> comprising the coupling parts/members <NUM> and <NUM> is located at a second end 10B of the hearing device as seen in <FIG>. The complementary member <NUM> of the hearing device <NUM> is introduced and/or hooked over the complementary adapted member <NUM> in a straight and/or somewhat rotary movement as seen in <FIG> at a second end 10B of the hearing device. The first hearing device end 10A comprises a first coupling part <NUM> placed at/on a part of the hearing device housing <NUM>. The second hearing device end 10B comprises a second coupling part <NUM> placed at/on a part of the hearing device housing <NUM>. The first hearing device end 10A comprises a first coupling member <NUM> placed at/on the hearing device housing cover <NUM>. The second hearing device end 10B comprises a second coupling member <NUM> at/on the hearing device housing cover <NUM>. The first coupling part <NUM> is configured for being part of a finger joint of the hearing device <NUM>. The second coupling part <NUM> is in some aspects configured for being part of a finger joint of the hearing device <NUM>. The first coupling member <NUM> is configured for being part of a finger joint of the hearing device <NUM>. The second coupling member <NUM> is in some aspects configured for being part of a finger joint of the hearing device <NUM>. The complementary member <NUM> is introduced/hooked over the complementary adapted member <NUM> at/on the second hearing device end 10B just before the first coupling parts <NUM> and <NUM> are joined in a finger joint at/on the first hearing device end 10A when the cover <NUM> is assembled onto the hearing device housing <NUM> to make up the whole hearing device <NUM> as seen in <FIG>. When detaching the cover <NUM> from the housing <NUM>, this is done in a reverse or opposite order. The hearing device <NUM> comprises in some aspects one or more finger joints as disclosed, e.g. one finger joint at its first end 10A or one finger joint at its second end 10B. The hearing device <NUM> comprises in some aspects at least two finger joints as disclosed, e.g. one finger joint at its first end 10A and one finger joint at its second end 10B.

In some aspects, the hearing device housing <NUM> or the cover <NUM> could optionally have a guiding pin or the like (not shown) protruding out of the housing or cover in a direction substantially perpendicular or perpendicular to the longitudinal directions of the locking pins <NUM>, <NUM> and being configured for introduction/receivment of a hole or receptacle (not shown) in the opposite entity, i.e. the cover <NUM> if the pin is placed in and protrudes out of the housing <NUM> or the housing <NUM> if the pin is placed in and protrudes out of the cover <NUM>. In some aspects, the housing <NUM> and/or cover <NUM> could each comprise more than one guiding pin and/or receptacle, e.g. a pair of pins/receptacles each.

The cover <NUM> is exchangeable to another type of cover and/or another cover comprising another type of filter <NUM> and/or at least two different types of filter as shown in <FIG>. Each filter <NUM> protects the interior of hearing device <NUM> from dirt or at least reduces the amount of dirt entering an audio channel <NUM>. Cover <NUM> and hearing device housing <NUM> are configured for creating a space therebetween such that at least a part of the filter <NUM> can be situated in the space created between cover and hearing device housing. In one aspect, at least a third of the volume of a filter <NUM> is provided in the associated cover void <NUM> and/or at least a third of the weight of a filter is provided in the cover void.

The tool <NUM> comprises an easy grippable handle having a first fixed pin <NUM> for pushing out a first locking pin <NUM> detachably connecting the cover <NUM> and the hearing device housing <NUM> as the hearing device <NUM>. The tool handle comprises the second detachable locking pin <NUM> being configured for replacing the first locking pin <NUM> and thereby once again detachably mating cover and hearing device housing after first disassembling these entities by pushing out the first locking pin and then pushing in the second locking pin <NUM> in the same holes <NUM>, <NUM> as the first locking pin <NUM>. The first locking pin <NUM> and second detachable locking pin <NUM> are essentially identical or identical in dimension (within the tolerances of this technical area). In one aspect, the first locking pin <NUM> and the second detachably locking pin <NUM> are made of the same material.

When the separate tool <NUM> and the hearing device <NUM> is in use, they together form a system <NUM> enabling easy exchange of the cover <NUM> of hearing device <NUM> (including one or more filters <NUM> and/or sealings <NUM>). In one aspect of the tool <NUM> and/or system <NUM>, the second detachable locking pin <NUM> is attached to the tool <NUM>, i.e. its second end 20B of its handle by a second friction force F<NUM>. In another aspect, the second friction force F<NUM> is lower than the first friction force F<NUM>. In yet an aspect, the second friction force F<NUM> is greater than the gravitational force acting on the detachable locking pin <NUM>. The second detachable locking pin <NUM> is held by a holder/receiver <NUM> of the handle of the tool <NUM>. The pushing of the second locking pin <NUM> into the same holes <NUM>, <NUM> as the first locking pin <NUM> is enabled by engaging an interface or surface <NUM> of the second tool end 20B against the end of a locking pin <NUM> as shown in <FIG>, <FIG> and <FIG> that pushes the locking pin further into a final assembly position shown in <FIG>. The surface <NUM> is flat and extends in a plane being perpendicular to the longitudinal axes of the tool <NUM> and its pins <NUM>, <NUM>. The surface <NUM> is shaped as a cross/plus sign as seen in <FIG> but could in other aspects be of circular or oval or shaped as letter O or have a triangular shape or another shape as long as this surface is able to abut/contact the end of the second locking pin <NUM> that protrudes out of the hole <NUM> of cover <NUM> of hearing device <NUM> as shown in <FIG>, i.e. the contacting area between surface <NUM> and the protruding end of the second locking pin <NUM> are separated from the centre area of the holder <NUM>, i.e. not coinciding with the centre of the holder <NUM> as shown in <FIG>. The holder <NUM> of the tool handle is in the form of a hole and/or bushing <NUM> for the second detachable locking pin <NUM>. The bushing <NUM> is made of plastic and/or rubber. The bushing <NUM> comprises a centre cavity or the centre hole in which the second detachable locking pin <NUM> is introduced and received and detachably held after introduction, which cavity/hole and pin <NUM> is adapted in size and/or shape and/or surface roughness and/or materials and/or dimensions such that the removable holding and/or attachment of the pin <NUM> by means of the second friction force F<NUM> is achieved. Examples of the shape of the centre cavity or hole of the holder <NUM> achieving the second friction force F<NUM> are cross-sections or openings with a shape corresponding to the surface <NUM> or with a circular cross-section or being shaped as a three-leaf clover or trefoil as seen in <FIG> when viewing the tool <NUM> from its second end 20B in the longitudinal direction of the tool.

The tool <NUM> comprises at least one outer rib <NUM> extending radially along the toool length, see <FIG> and <FIG>, for increased/better/improved grip when held/moved to push against and pull away from the pins <NUM>, <NUM>. As a preferred example, the tool <NUM> comprises four ribs <NUM> distributed symmetrically around the envelope surface of the tool <NUM>. The four ribs <NUM> are configured to secure holding of and simplify/improve making of the tool <NUM>, in particular if plastic moulded, as the ribs transcend at their ends towards the first tool end 20A with a decreasing height radially relative the longitudinal axis of the tool towards the first pin <NUM>. The four ribs <NUM> are configured to secure holding of and simplify/improve making the tool <NUM>, in particular if plastic moulded, as these ribs transcend at their ends towards the second tool end 20B and the holder <NUM> corresponding ribs that abruptly ends in/at the plane of the surface <NUM>.

In <FIG>, the tool <NUM> is shown with one detachable protection caps <NUM> assembled and configured for covering the second detachable pin <NUM> and/or the first fixed pin <NUM> when attached to the tool handle. In <FIG>, the tool <NUM> is shown with its detachable protection cap <NUM> removed from its handle to reveal/expose and give access to the second detachable pin <NUM> for enabling its introduction into the hearing device <NUM> but could have at least two such caps <NUM>. The detachable protection cap <NUM> is shown transparent but could in other aspects be opaque and/or partly transparent. In <FIG>, <FIG>, and <FIG>, the tool <NUM> is shown elongated with certain proportions, but could in other aspects have other proportions, e.g. be thicker or thinner for better/optimised grip and/or longer/shorter depending on the size of hearing device <NUM> and/or have a shorter or longer fixed pin <NUM> depending on the width of the hearing device that is necessary to protrude through when pushing out a locking pin <NUM>, <NUM>. The first fixed pin <NUM> is situated with its longitudinal axis in parallel with the longitudinal axis of tool <NUM>, but could be somewhat inclined in relation thereto or even be partly bent/curved, but then would at least a sufficient length of the pin <NUM> have to be straight.

The second detachable pin <NUM> is situated with its longitudinal axis in parallel with the longitudinal axis of the tool <NUM> when attached to the tool handle but could also extend at least somewhat inclined in relation to the the longitudinal axis of the tool <NUM> or even extend substantially perpendicular or perpendicular to the longitudinal axis of the tool <NUM> requiring another orientation and movement of the tool <NUM> when pushing in and out the first and second pins <NUM>, <NUM>. The present layout/structure/design of the hearing device <NUM> and location of its holes <NUM>, <NUM> and the tool <NUM> give a stability and repeatability when aligning and moving these entities in relation to each other. The first fixed pin <NUM> and the second detachable pin <NUM> are situated at opposite ends 20A, 20B of the tool <NUM>, i.e. its handle to provide a better and easier targeting of the holes <NUM>, <NUM>.

The hearing device <NUM> optionally includes a wireless communication unit, e.g. in the form of a radio chip connected to an antenna and configured to communicate wirelessly with other devices, e.g. in a hearing loss aiding network as is well-known in the art.

In one aspect of the invention, a system <NUM> comprises the hearing device <NUM> and a separate tool <NUM> with a handle. The tool <NUM> is adapted for enabling easy and quick exchange of the cover <NUM> of the hearing device <NUM> and thereby one or more filters <NUM> of the cover. Another aspect of the invention also relates to the tool itself. In one aspect of the invention, the finger or gear like joint achieved by the complementary coupling parts <NUM>, <NUM>, <NUM>, <NUM> and the holes <NUM>, <NUM> and the pins <NUM>, <NUM> are applicable in other devices than hearing devices <NUM> where detachment of one part from another part, in an easy and reliable way, is required, e.g. when detaching or attaching a battery lid.

Claim 1:
A hearing device (<NUM>) comprising a hearing device housing (<NUM>) having at least one microphone (<NUM>) and a cover (<NUM>) comprising at least one filter (<NUM>) for covering an audio channel (<NUM>) for channeling sound between the surroundings and the at least one microphone arranged in the hearing device housing, said hearing device housing comprising a control unit (<NUM>) and a power source (<NUM>), the hearing device housing comprises a sealing (<NUM>) for sealing the interior of the hearing device housing against damp, moist, dirt and dust for protection of the control unit and the power source, the control unit being operationely connected to the at least one microphone and the power source, the cover and the hearing device housing comprising complementary coupling parts (<NUM>, <NUM>, <NUM>, <NUM>) for detachable connection such that said cover is ex-changeable, wherein the hearing device housing (<NUM>) is kept sealed when the cover is disconnected from it,
wherein the cover (<NUM>) is exchangeable to another type of cover, and
wherein the cover (<NUM>) is exchangeable to another cover comprising another type of filter (<NUM>).