Patent Publication Number: US-2022217483-A1

Title: Hearing device system and tool

Description:
RELATED APPLICATION DATA 
     This application is a continuation of International Patent Application No. PCT/EP2020/080112 filed on Oct. 27, 2020, which claims priority to, and the benefit of European Patent Application No. 19206230.5 filed on Oct. 30, 2019. The entire disclosures of the above applications are expressly incorporated by reference herein. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a system comprising a hearing device and a separate tool with handle. The tool is adapted for enabling easy and quick exchange of a cover of the hearing device and thereby a filter of the cover. The present disclosure also relates to the tool itself. 
     BACKGROUND ART 
     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 EP 2 871 864 B1. 
     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. 
     SUMMARY 
     One object is to provide a system of a hearing device and a tool, and the tool itself, that enable easy change of hearing devices&#39; 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. 
     According to the disclosure at least one of the objects is 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 surroundings and the at least one microphone arranged in the hearing device housing, the 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 operatively connected to the microphone and power source, the cover and hearing device housing comprising complementary coupling parts for detachable connection such that the 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. 
     The present disclosure relates to different aspects including the hearing device described above and in the following, and corresponding hearing devices, binaural hearing devices, larger and/or smaller hearing devices, hearing devices being more or less advanced, e.g. having more or less functionalities, systems, methods, devices, uses and/or product means for helping people with hearing loss and/or any other equipment configured to be used together with and/or in cooperation with hearing devices, each yielding one or more of the benefits and advantages described in connection with the first mentioned aspect, and each having one or more embodiments corresponding to the embodiments described in connection with the first mentioned aspect and/or disclosed in the appended claims. 
     According to some embodiments, 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 and/or sides and/or 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 and/or sides and/or walls. In some embodiments, the hearing device housing comprises flanges and/or sides and/or 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. 
     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. 
     In another aspect, one or more of the above objects are achieved by means of a tool, as claimed in the associated independent claim, preferred variants thereof being defined in associated dependent claims. 
     The present disclosure relates to different aspects including the tool described above and in the following, and being configured for use with corresponding hearing devices, binaural hearing devices, larger and/or smaller hearing devices, hearing devices being more or less advanced, e.g. having more or less functionalities, systems, methods, devices, uses and/or product means for helping people with hearing loss and/or any other equipment configured to be used together with and/or in cooperation with hearing devices, each yielding one or more of the benefits and advantages described in connection with the second mentioned aspect, and each having one or more embodiments corresponding to the embodiments described in connection with the second mentioned aspect and/or disclosed in the appended claims. 
     According to the disclosure at least one of the objects are achieved by a tool for exchanging a cover of a hearing device according to above and/or below comprising a hearing device housing, the tool comprising a handle having a first fixed pin for pushing out a locking pin detachably connecting the cover and the hearing device housing, wherein the handle further comprises a second detachable pin, which can replace the locking pin and thereby detachably mating the cover and the hearing device housing. An advantage of such a tool is that it is easy to access and to hold/grip. Another advantage is that its pins, in particular the detachable one is easy to keep track of and eliminates or at least reduces the risk of loosing it. 
     Further objects and features will appear from the following description of aspects of the embodiment(s) together with their/its advantages. 
     In some embodiments, the locking pin detachably connecting the cover and hearing device housing s configured for being locked into the cover and hearing device housing by a first friction force adapted to keep the locking pin in place during normal use of the hearing device. Hence, the locking pin is held in place without any need of additional means for securing it in place, such as snap means, springs, glue or the like. In some embodiments, the locking pin and the second detachably pin are essentially identical in dimension. These pins above and below are both intended to detachably lock the cover and housing detachably together to form the hearing device. Another advantage is that the detachable pin is easy to keep track of and eliminates or at least reduces the risk of loosing it. In some embodiments, the locking pin and the second detachably pin are made of the same material. Hence, they can be manufactured easily in the same machine due to no need of storing and handling different materials, and are easy to recycle in the same way. According to some embodiments, the second detachable pin is attached to the tool handle by a second friction force. An advantage is therefore that the detachable pin is easy to keep track of and eliminates or at least reduces the risk of loosing it without being to difficult/hard to detach from the tool. 
     According to some embodiments, the second friction force is lower than the first friction force. An advantage is therefore that the detachable pin is easy to detach from the tool while being securely held by the tool until it is to be detached. In some embodiments, the second friction force is greater than the gravitational force acting on the second detachable pin. An advantage is that the detachable pin is easy to detach from the tool while being securely held by the tool until it is to be detached and does not come loose inadvertently, or is at least not prone to come loose inadvertently. 
     According to some embodiments, the tool handle comprises a holder/bushing for the second detachable pin. An advantage is therefore that the detachable pin is easy to detach from the holder/bushing of the tool while being securely held by the holder/bushing until it is to be detached and does not come loose inadvertently. 
     According to some embodiments, the holder/bushing of the tool is made of plastic and/or rubber. Hence, advantages are that the grip of the bushing for detachably holding the second pin is easy to maintain and/or optimise. 
     According to some embodiments, the tool comprises a detachable protection cap configured for covering the second detachable pin when attached to the tool handle. An advantage is therefore that the detachable pin is protected from being detached from the tool as the cap securely covers it until it is to be detached and does not come loose inadvertently, or is at least not prone to come loose inadvertently as the cap must be detached firstly. 
     According to some embodiments, in the tool, the detachable protection cap is transparent. An advantage is therefore that the detachable pin is easy to see before detaching it from the tool to be able to check if it has come loose inadvertently or not. In some embodiments, the tool is elongated. An advantage of such an elongated tool is that it is easy to hold/grip by a users hand/palm of the users hand. According to some embodiments, in the tool, the first fixed pin is situated with its longitudinal axis in parallel with the longitudinal axis of the tool. According to some embodiments, in the tool, the second detachable pin is situated with its longitudinal axis in parallel with the longitudinal axis of the tool when attached to the tool handle. 
     According to some embodiments, the tool comprises a detachable protection cap configured for covering the second detachable pin and/or a first fixed pin when attached to the tool handle. Advantages for the second detachable pin are that it does not risk getting lost by falling off the handle if coming loose by mistake and that the user is protected from being stung/pricked by the second detachable pin as it is securely covered by the cap or at least reduces this risk of injury as the cap then must be detached before the second detachable pin is exposed. An advantage for the first fixed pin is that the user is protected from being stung/pricked by the first fixed pin as it is securely covered by the cap or at least reduces this risk of injury as the cap then must be detached before the first fixed pin is exposed (again). 
     According to some embodiments, the tool comprises a handle having a first fixed pin for pushing out a locking pin detachably connecting the cover and the hearing device housing, wherein the handle further comprises a second detachable pin, which can replace the locking pin and thereby detachably mating cover and hearing device housing, and a detachable protection cap configured for detachably covering the second detachable pin when attached to the tool handle in a first mode, the handle and cap being mutually configured to enable the cap to detachably cover the first fixed pin in a second mode after the first fixed pin has been used for pushing out the locking pin and the second pin is to be detachably assembled. An advantage is that the user is protected from being stung/pricked by the first fixed pin as it is securely covered by the cap or at least reduces this risk of injury as the cap then must be detached firstly before the first fixed pin is exposed again. In some embodiments the first fixed pin is arranged at an end of the tool being opposite the end where the second pin is located before it and the cap is detached. Hence, the cap is moved to the other tool end and detachably assembled over the first fixed pin after the first fixed pin has been used to push out the locking pin wherefore the user when pushing on the handle when assembling the second pin do not risk pricking any part of a hand on the fixed pin when pushing on the handle to introduce/push in the second pin into the hearing device for mating its cover and housing as the cap covers it. The cap may be shaped as a cup with a bottom that covers both the protruding end of the first fixed pin and/or the second detachable pin in the radial direction of the handle and at least the whole protruding and exposed length of the first fixed pin and/or the second detachable pin in the axial direction of the handle or a hollow tube with no closed ends covering at least the whole protruding and exposed length of the first fixed pin in the axial direction of the handle. 
     In some embodiments, in the tool, the first fixed pin and the second detachable pin are situated at opposite ends of the tool handle. An advantage is therefore that the pins are easy to keep track of and makes the tool more compact and more flexible as no separate or additional storage or track of a loose pin for exchange is required. 
     Other advantages provided by such a tool is that the hearing device and the tool are separate and easy to use as the tool has a “builtin” detachable locking pin that eliminates or at least reduces the risk of loosing a loosened such small locking pin before replacing an existing locking pin, and that the tool is one and the same separate tool being usable for two functions, i.e. disassembly of the cover from the hearing device housing for cleaning and/or exchange of cover/filters and assembly of the cover to the hearing device housing by providing two “builtin” pins, one fixed pin adapted for pushing out an existing/first locking pin in the hearing device, at one end of the tool, and one second or other or additional detachable locking pin adapted to be pushed by another end of the tool into the hearing device at the same location as the first locking pin for replacing it. 
     In one more aspect, one or more of the above objects are achieved by means of a system, as claimed in the associated independent claim, preferred variants thereof being defined in associated dependent claims. 
     The present disclosure relates to different aspects including the system described above and in the following, comprising corresponding hearing devices, binaural hearing devices, larger and/or smaller hearing devices, hearing devices being more or less advanced, e.g. having more or less functionalities, systems, methods, devices, uses and/or product means for helping people with hearing loss and/or any other equipment, such as the tool and/or similar tool, configured to be used together with and/or in cooperation with hearing devices, each yielding one or more of the benefits and advantages described in connection with the third mentioned aspect, and each having one or more embodiments corresponding to the embodiments described in connection with the third mentioned aspect and/or disclosed in appended claims. 
     One advantage of such a system comprising such a hearing device and tool is that they are easy to use together by having an accessible tool handle that is easy to hold/grip and align with the hearing device. 
     According to the disclosure at least one of the objects are achieved by a system comprising a hearing device according to above and/or below, and a tool according to above and/or below for exchanging a cover and/or sealing of the hearing device, wherein the tool comprises a handle having a first fixed pin for pushing out a/the locking pin detachably connecting/mating the cover and hearing device housing, wherein the tool handle further comprises a second detachable pin being configured for replacing the locking pin and thereby detachably mating the cover and the hearing device housing. 
     Further objects and features will appear from the following description. 
     In some embodiments, the locking pin detachably mating cover and hearing device housing is configured for being locked into the cover and hearing device housing by a first friction force adapted to keep the locking pin in place during normal use of the hearing device. As an advantage, the locking pin is held in place without need of additional means for securing it in place, such as snap means, springs, glue or the like. According to some embodiments, in the system, the second detachable pin is attached to the handle by a second friction force. According to some embodiments, in the system, the second friction force is lower than the first friction force. In some embodiments, in the system, the second friction force is greater than the gravitational force acting on the locking pin. According to some embodiments, in the system, the tool handle comprises a holder/bushing for the second detachable pin. According to some embodiments, in the system, the holder/bushing is made of plastic and/or rubber. 
     Another advantage of such a hearing device of a system is that it is easy to clean, e.g. by being directly put into water and/or other liquid for cleaning without worrying about any leakage of liquid into the electronics of the hearing device. Yet another advantage of such a hearing device of a system is that it is possible to wear it when showering and/or even bathing and/or swimming and/or even during any downpour without risking its functionality by water leaking into the electronics of the hearing device. A further advantage of such a hearing device of a system comprising such a one is that the hearing device and the tool is easy to use together by having an accessible tool handle that is easy to hold/grip and align. 
     Still another advantage provided by such a hearing device and/or a system comprising such a one and a separate tool is that the hearing device and the separate tool are easy to use as the tool has a “builtin” detachable locking pin that eliminates or at least reduces the risk of loosing a loosened such small locking pin before replacing an existing locking pin already in the hearing device. One advantage is that such a tool eliminates the need of two separate tools, i.e. one separate tool for detaching the cover and/or the first locking pin and a second tool comprising the second detachable pin and adapted to detachably attach the second detachable pin instead of the first detachable locking pin are not required. 
     One other advantage by means of such a hearing device and/or a system comprising such a one and a separate tool is that one and the same separate tool is usable for two functions, i.e. disassembly of the cover from the hearing device housing for cleaning and/or exchange of its cover/filters and assembly of the cover to the hearing device housing by providing two “builtin” pins, one fixed pin adapted for pushing out an existing/first locking pin in the hearing device and one second/other/additional detachable locking pin adapted to be pushed into the hearing device at the same location as the first locking pin for replacing it. This is a simplified and more stable/secure way of exchanging cover and/or its filters and/or its sealings of a hearing device by using both hands by a user, one hand holding the hearing device and the other hand holding/moving the tool as desired. 
     Further objects and features will appear from the following description of aspects/examples/embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The embodiments will be described in more detail with reference to the enclosed figures. 
         FIG. 1  is a perspective view of a hearing device comprising an enclosure that in turn comprises two parts, one housing and one cover according to an embodiment. 
         FIG. 2  is a perspective view of a system shown in a first stage, the system comprising a hearing device according to  FIG. 1  and a separate tool, with a first and a second end, being adapted for both separating the two-part hearing device into its housing part and cover and to assemble the two-parts of the hearing device, i.e. its housing part and cover, into the whole hearing device again, which first stage shows the hearing device in an assembled state before the hearing device is disassembled according to an embodiment. 
         FIG. 3  is a perspective view of the system of  FIG. 2  shown in a second stage, where the tool has been aligned in a certain position with a first end comprising a fixed protruding push pin facing the hearing device and moved in the direction of the straight dotted arrow of  FIG. 2  such that its push pin protrudes into and through the hearing device to engage a first locking pin and pushes this first locking pin in the hearing device out of the hearing device in the direction of the straight dotted arrow of  FIG. 3  to enable separating the cover from the housing part according to an embodiment. 
         FIG. 4  is a perspective view of the system of  FIGS. 2 and 3  shown in a third stage, where the tool has been moved in an opposite direction (straight dotted arrow of  FIG. 4 ) compared to the direction of the straight dotted arrow of  FIG. 2  to pull its push pin out of the hearing device according to an embodiment. 
         FIG. 5  is a perspective view showing the hearing device of  FIGS. 1 to 4  in disassembled state, i.e. its parts forming its enclosure are being assembled together after being detached as shown in  FIGS. 2 to 4  and symbolised by the straight/bent/curved dotted arrow heads I or are/are being disconnected as symbolised by the straight/bent/curved dotted arrow heads II according to an embodiment. 
         FIG. 6  is a perspective view of the system of  FIGS. 2, 3 and 4  shown in a fourth stage, where the tool has been turned 180 in the direction of the bent/curved dotted arrows of  FIG. 4 , so that its other/second end comprising a detachable second locking pin faces the hearing device, and a detachable cap/lid of this other/second end of the tool has been detached/removed by being withdrawn from the second tool end in the direction of the straight dotted arrow II to reveal/expose the detachable second locking pin and then is aligned in the corresponding position as for the push pin of  FIGS. 2 and 4 , such that the second locking pin is able to be pushed into the hearing device at the same location as the first locking pin by moving the tool towards the hearing device in the direction of the other straight dotted arrow with one arrow head of  FIG. 6  according to an embodiment. In  FIG. 6 , the detachable cap/lid of the tool is possible to assemble onto the second tool end by being pushed onto it in the direction of the straight dotted arrow I to cover the detachable second locking pin according to an embodiment. 
         FIG. 7  is a perspective view of the system of  FIGS. 2, 3, 4 and 6  shown in a fifth stage, where the tool has been moved with its second locking pin towards and into contact/engagement with the hearing device in the direction of the straight dotted arrow with single arrow head of  FIG. 6  such that its second locking pin protrudes into the hearing device to partly engage it to prepare/initiate final assembly of the cover and housing part of the hearing device according to an embodiment. 
         FIG. 8  is a perspective view of the system of  FIGS. 2, 3, 4, 6 and 7  shown in a sixth stage, where the tool has been moved from the position in  FIG. 7  away from the hearing device in the opposite direction, i.e. according to the straight dotted arrow with single arrow head of  FIG. 8  extending along the length of the tool, such that its second locking pin is released from the tool and protrudes partly out of the hearing device to prepare/initiate final assembly of the cover and housing part of the hearing device according to an embodiment. 
         FIG. 9  is a perspective view of the system of  FIGS. 2, 3, 4, 6, 7 and 8  shown in a seventh stage, where the tool has been moved with its second end firstly along the hearing device in a direction substantially perpendicular or perpendicular to the longitudinal extension of the tool as visualised with the left straight dotted arrow of  FIG. 8  and then in the direction of the straight dotted arrow of  FIG. 9  being the opposite direction compared to the right straight dotted arrow in  FIG. 8  towards and again into contact/engagement with the hearing device and the exposed end of the partly protruding second locking pin of  FIG. 8  of its second end such that the second locking pin is pushed further into the hearing device until it is substantially flush or flush or even somewhat retracted below the outer surface of the hearing device to finally engage and assemble the cover and housing part of the hearing device detachably together according to an embodiment. 
         FIG. 10  is a perspective view of the hearing device according to  FIGS. 1 to 9  with a new locking pin that also is replaceable if required later on according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Various embodiments are described hereinafter with reference to the figures. Like reference numerals refer to like elements throughout. Like elements will, thus, not be described in detail with respect to the description of each figure. It should also be noted that the figures are only intended to facilitate the description of the embodiments. They are not intended as an exhaustive description of the claimed invention or as a limitation on the scope of the claimed invention. In addition, an illustrated embodiment needs not have all the aspects and/or advantages shown. An aspect or an advantage described in conjunction with a particular embodiment is not necessarily limited to that embodiment and can be practiced in any other embodiments even if not so illustrated, or if not so explicitly described. Throughout, the same reference numerals are used for identical or corresponding parts. 
     A system  1  comprising at least one hearing device  10  and at least one tool  20  is shown in  FIGS. 2-4 and 6-9  as examples/embodiments. The hearing device  10  comprises a housing  100  having at least one sealing  130  and at least one detachable cover  200  having at least one exchangeable audio filter  210 . The separate tool  20  with handle is adapted for disconnecting the cover  200  from the housing  100  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  10  is shown in  FIGS. 1-10  as an example/embodiment. The hearing device  10  comprises the housing  100 , at least one microphone  110 , at least one audio channel  120  to guide sound to the microphone. The hearing device  10  comprises the at least one sealing  130 , a first coupling part  140  and a second coupling part  150  for detachable connection with corresponding or mating parts  240 ,  250  of cover  200 . The hearing device  10  comprises a mating and/or upper and/or top interface or part and/or flange/-s/side/-s/wall/-s  160  at which the cover  200  is removably connected. The hearing device  10  comprises a lower or outer enclosure or part  170  facing away from its upper part  160 . The hearing device  10  comprises at least one locking hole  180  for detachable connection and alignment with one or more corresponding hole/-s  260  of cover  200  to enable a locking pin  400 ,  410  to protrude therethrough. The complementary coupling parts  140 ,  150 ,  240 ,  250  comprise snap coupling means configured for detachably connecting cover  200  and hearing device housing  100 . The complementary coupling parts  140 ,  150 ,  240 ,  250  comprise the exchangeable locking pin  400 ,  410  being configured for detachably connecting cover  200  and hearing device housing  100 . The complementary coupling parts  140 ,  150 ,  240 ,  250  are configured for engaging the exchangeable locking pin  400 ,  410  that in turn is configured for detachably connecting cover  200  and hearing device housing  100  by engaging and locking into the complementary coupling parts. The holes  180  is inner holes of the hearing device  10 . The other holes  260  is situated closer to the outer/envelope surface of the hearing device  10 , i.e. its cover  200  and/or its housing  100 , and/or the other holes  260  are outer through holes and/or have orifices that the locking pin  410  firstly enter before entering the inner through holes  180  when pushed in. The complementary coupling parts  140 ,  150 ,  240 ,  250  are configured to mate as a finger joint, almost intertwined, whereafter the holes  180  on/in first fingers and holes  260  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  21  and lockings pins  400 ,  410  are able to be pushed through and into/out of this through passage of holes  180 ,  260  when a new locking pin  410  is assembled into the holes as a beam and the first locking pin  400  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  400  and the first pin  410  then changes place. 
     The holes  180  of hearing device housing  100  are configured for alignment with the similar cover holes  260  such that the cover is able to be detachably locked with the hearing device housing by means of the exchangeable locking pin  400 ,  410  as being configured for engaging and detachably locking into the aligned holes  180 ,  260  in both cover and housing when finally assembled together. The complementary coupling parts  240 ,  250  of cover  200  comprise the holes  260  situated in the flanges/sides/walls  230  being configured for alignment with the similar holes  180  of the complementary coupling parts  140 ,  150  of housing  100  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  400 ,  410  to engage and lock into all the aligned holes  180 ,  260  by being pushed therethrough. The cover and housing holes  180 ,  260  and each exchangeable locking pin  400 ,  410  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 1  (see  FIG. 2 ) adapted to keep the locking pin in place during normal use of the hearing device  10  after assembly. The hearing device  10  comprises at least one power source  190 , e.g. a battery, for its operation. 
     The hearing device  10  comprises and is controlled by at least one controlling unit, e.g. via a knob or button  300  that is accessible from its exterior. The unit for controlling hearing device  10  is operatively connected to other components including the microphones  110  and battery  190 , 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  200  comprises an user interface, e.g. the knob  300 , configured for controlling at least the power source  190  of the hearing device  10  for its operation. The user interface is a button  300  being movably and mechanically connected to cover  200  such that the button is operatively connected to the control electronics of hearing device  10  and its power source  190  when the cover is detachably connected to the hearing device housing  100  but could in other aspects be a touch sensitive button using the same technology as a touch screen. The button  300  is operatively connected to the control electronics of hearing device  10  and at least its power source  190  via at least a part of the sealing  130  of hearing device housing  100 . 
     The sealing  130  of the hearing device  10  is adapted for sealing the interior of the hearing device housing  100  against damp, moist, water or other liquids, dirt and dust for protection of control circuits, including control unit  300  and power source  190  and all other associated components necessary for operation of the hearing device  10 . The cover  200  and hearing device housing  100  comprise the complementary coupling parts  140 ,  150 ,  240 ,  250  for detachable connection, such that the cover is exchangeable while keeping the hearing device housing  100  tightly sealed/watertight, when the cover is disconnected from it, but also when the cover is connected to the housing. The sealing  130  comprises silicone and/or is at least partly made of silicone and/or is provided by a silicone membrane. 
     Each microphone  110  works as an input transducer and the functionality of hearing device  10  is explained shortly here as its function is common knowledge for a skilled person. Each microphone  110  receives sound through an audio channel  120  and a filter  210  and outputs an analogue audio signal based on the acoustic sound signal arriving at the microphone when the hearing device  10  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  10  may be configured to restore loudness, such that loudness of the hearing loss compensated signal as perceived by the user wearing the hearing device  10  substantially matches the loudness of the acoustic sound signal arriving at the microphone  110  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&#39;s individual hearing loss. The hearing loss processor is operatively coupled to the control unit and/or master unit and/or the knob  300  of hearing device  10  in a way being common knowledge to a skilled person, wherefore this functionality of the hearing device is not further explained herein. 
     The separate tool  20  is shown in  FIGS. 2-4 and 6-9  as examples/embodiments. The tool  20  is adapted for easy and quick exchange of a cover  200  with one or more filters  210  (audio filters or the like). This is enabled in that the cover  200  is detachable from the hearing device housing  100 , which also enables changing a sealing  130  if desired, after the cover is detached from the housing as this gives access to sealing  130  and/or filters  210 . The cover  200  comprises at least one void or cavity  220  for receiving and/or holding at least a part of or the whole filter  210 . The cover  200  comprises at least one flange or side or wall  230 . The cover  200  comprises at least one first coupling member  240  for detachable connection with the first coupling part  140  of housing  100  and at least one second coupling member  250  for detachable connection with the second coupling part  150  of housing  100 . The cover  200  comprises at least one locking hole  260  for detachable connection and alignment with one or more of the corresponding holes  180  of housing  100  by means of the locking pin  400 ,  410  protruding therethrough. The cover  200  comprises the flanges and/or sides and/or walls  230  configured for fitting to the hearing device housing  100  such that at least a part of the flange/wall/side  160  of the hearing device housing can be enclosed by the flanges and/or sides and/or walls of cover  200  or hearing device housing  100  comprises one or more flanges and/or sides and/or walls  160  configured for fitting to cover  200  such that at least a part of cover/cover flange/side/wall  230  can be enclosed by a flange/side/wall  160  of housing  100 . In one aspect, the complementary hearing device coupling parts  140 ,  150 ,  240 ,  250  comprise at least two sets of different coupling parts, one part being a hook-like member  250  (see  FIG. 5 ) and a thereto adapted member  150  so that movement between the cover  200  and the hearing device housing  100  is limited when connected by the one part, and a second part  140 ,  240  complementing the one part  150 ,  250  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  10  comprising the coupling parts  140  and  240  is located at a first end  10 A of the hearing device as seen in  FIG. 5 . The one part of the hearing device  10  comprising the coupling parts/members  150  and  250  is located at a second end  10 B of the hearing device as seen in  FIG. 5 . The complementary member  250  of the hearing device  10  is introduced and/or hooked over the complementary adapted member  150  in a straight and/or somewhat rotary movement as seen in  FIG. 5  at a second end  10 B of the hearing device. The first hearing device end  10 A comprises a first coupling part  140  placed at/on a part of the hearing device housing  100 . The second hearing device end  10 B comprises a second coupling part  150  placed at/on a part of the hearing device housing  100 . The first hearing device end  10 A comprises a first coupling member  240  placed at/on the hearing device housing cover  200 . The second hearing device end  10 B comprises a second coupling member  250  at/on the hearing device housing cover  200 . The first coupling part  140  is configured for being part of a finger joint of the hearing device  10 . The second coupling part  150  is in some aspects configured for being part of a finger joint of the hearing device  10 . The first coupling member  240  is configured for being part of a finger joint of the hearing device  10 . The second coupling member  250  is in some aspects configured for being part of a finger joint of the hearing device  10 . The complementary member  250  is introduced/hooked over the complementary adapted member  150  at/on the second hearing device end  10 B just before the first coupling parts  140  and  240  are joined in a finger joint at/on the first hearing device end  10 A when the cover  200  is assembled onto the hearing device housing  100  to make up the whole hearing device  10  as seen in  FIG. 5 . When detaching the cover  200  from the housing  100 , this is done in a reverse or opposite order. The hearing device  10  comprises in some aspects one or more finger joints as disclosed, e.g. one finger joint at its first end  10 A or one finger joint at its second end  10 B. The hearing device  10  comprises in some aspects at least two finger joints as disclosed, e.g. one finger joint at its first end  10 A and one finger joint at its second end  10 B. 
     In some aspects, the hearing device housing  100  or the cover  200  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  400 ,  410  and being configured for introduction/receivment of a hole or receptacle (not shown) in the opposite entity, i.e. the cover  200  if the pin is placed in and protrudes out of the housing  100  or the housing  100  if the pin is placed in and protrudes out of the cover  200 . In some aspects, the housing  100  and/or cover  200  could each comprise more than one guiding pin and/or receptacle, e.g. a pair of pins/receptacles each. 
     The cover  200  is exchangeable to another type of cover and/or another cover comprising another type of filter  210  and/or at least two different types of filter as shown in  FIG. 5  or more. Each filter  210  protects the interior of hearing device  10  from dirt or at least reduces the amount of dirt entering an audio channel  120 . Cover  200  and hearing device housing  100  are configured for creating a space therebetween such that at least a part of the filter  210  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  210  is provided in the associated cover void  220  and/or at least a third of the weight of a filter is provided in the cover void. 
     The tool  20  comprises an easy grippable handle having a first fixed pin  21  for pushing out a first locking pin  400  detachably connecting cover  200  and hearing device housing  100  as the hearing device  10 . The tool handle comprises the second detachable locking pin  410  being configured for replacing the first locking pin  400  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  410  in the same holes  180 ,  260  as the first locking pin  400 . The first locking pin  400  and second detachable locking pin  410  are essentially identical or identical in dimension (within tolerances of this technical area). In one aspect, the first locking pin  400  and the second detachably locking pin  410  are made of the same material. 
     When the separate tool  20  and the hearing device  10  is in use, they together form a system  1  enabling easy exchange of the hearing device cover  200  (including one or more filters  210  and/or sealings  130 ). In one aspect of the tool  20  and/or system  1 , the second detachable locking pin  410  is attached to the tool  20 , i.e. at its second end  20 B of its handle by a second friction force F 2 . In one aspect, the second friction force F 2  is lower than the first friction force F 1 . In one aspect, the second friction force F 2  is greater than the gravitational force acting on the detachable locking pin  410 . The second detachable locking pin  410  is held by a holder and/or receiver  23  of the handle of the tool  20 . The pushing of the second locking pin  410  into the same holes  180 ,  260  as the first locking pin  400  is enabled by engaging an interface or surface  24  of the second tool end  20 B against the end of a locking pin  410  as shown in  FIGS. 2, 8 and 9  that pushes the locking pin further into a final assembly position shown in  FIG. 10 . The surface  24  is flat and extends in a plane being perpendicular to the longitudinal axes of the tool  20  and its pins  21 ,  410 . The surface  24  is shaped as a cross/plus sign as seen in  FIGS. 2-4  but could in other aspects be 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  410  that protrudes out of the hole  260  of cover  200  of hearing device  10  as shown in  FIG. 8 , i.e. the contacting area between surface  24  and the protruding end of the second locking pin  410  are separated from the centre area of the holder  23 , i.e. not coinciding with the centre of the holder  23  as shown in  FIGS. 2-4 . The holder  23  of the tool handle is in the form of a hole and/or bushing  23  for the second detachable locking pin  410 . The bushing  23  is made of plastic and/or rubber. The bushing  23  comprises a centre cavity or the centre hole in which the second detachable locking pin  410  is introduced and received and detachably held after introduction, which cavity/hole and pin  410  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  410  by means of the second friction force F 2  is achieved. Examples of the shape of the centre cavity or hole of the holder  23  achieving the second friction force F 2  are cross-sections or openings with a shape corresponding to the surface  24  or with a circular cross-section or being shaped as a three-leaf clover or trefoil as seen in  FIG. 2  when viewing tool  20  from its second end  20 B in the longitudinal direction of the tool. 
     The tool  20  comprises at least one outer rib  25  extending radially along the tool length, see  FIGS. 2-4 and 6-9 , for increased/better/improved grip when held/moved to push against and pull away from the pins  400 ,  410 . As a preferred example, the tool  20  comprises four ribs  25  distributed symmetrically around the envelope surface of the tool  20 . The four ribs  25  are configured to secure holding of and simplify/improve making of the tool  20 , in particular if plastic moulded, as the ribs transcend at their ends towards the first tool end  20 A with a decreasing height radially relative the longitudinal axis of the tool towards the first pin  21 . The four ribs  25  are configured to secure holding of and simplify/improve making the tool  20 , in particular if plastic moulded, as these ribs transcend at their ends towards the second tool end  20 B and the holder  23  corresponding ribs that abruptly ends in/at the plane of the surface  24 . 
     In  FIGS. 2-4 , the tool  20  is shown with one detachable protection cap  22  assembled and configured for covering the second detachable pin  410  and/or the first fixed pin  21  when attached to the tool handle. In  FIG. 6 , the tool  20  is shown with its detachable protection cap  22  removed from its handle to reveal/expose and give access to the second detachable pin  410  for enabling its introduction into the hearing device  10  but could have at least two such caps  22 . The detachable protection cap  22  is shown transparent but could in other aspects be opaque and/or partly transparent. In  FIGS. 2-4, 6, and 7-9 , the tool  20  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  10  and/or have a shorter or longer fixed pin  21  depending on the width of the hearing device that is necessary to protrude through when pushing out a locking pin  400 ,  410 . The first fixed pin  21  is situated with its longitudinal axis in parallel with the longitudinal axis of tool  20 , 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  21  have to be straight. 
     The second detachable pin  410  is situated with its longitudinal axis in parallel with the longitudinal axis of the tool  20  when attached to the tool handle but could also extend at least somewhat inclined in relation to the longitudinal axis of the tool  20  or even extend substantially perpendicular or perpendicular to the longitudinal axis of the tool  20  requiring another orientation and movement of the tool  20  when pushing in and out the first and second pins  400 ,  410 . The present layout/structure/design of the hearing device  10  and location of its holes  180 ,  260  and the tool  20  give a stability and repeatability when aligning and moving these entities in relation to each other. The first fixed pin  21  and the second detachable pin  410  are situated at opposite ends  20 A,  20 B of the tool  20 , i.e. its handle to provide a better and easier targeting of the holes  180 ,  260 . 
     The hearing device  10  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, a system  1  comprises the hearing device  10  and a separate tool  20  with a handle. The tool  20  is adapted for enabling easy and quick exchange of the cover  200  of the hearing device  10  and thereby one or more filters  210  of the cover. Another aspect also relates to the tool itself. In one aspect, the finger or gear like joint achieved by the complementary coupling parts  140 ,  150 ,  240 ,  250  and the holes  180 ,  260  and the pins  400 ,  410  are applicable in other devices than hearing devices  10  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. 
     In some aspects, an item no 1 concerns a hearing device  10  comprising a hearing device housing  100 . The hearing device housing  100  comprises at least one microphone  110  and a cover  200 . The cover  200  comprises at least one filter  210  for covering an audio channel  120  for channeling sound between the surroundings and the at least one microphone arranged in the hearing device housing. The hearing device housing  100  comprises a control unit  300  and a power source  190 . The hearing device housing  100  comprises a sealing  130  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  300  being operatively connected to the microphone  110  and the power source  190 . The cover  200  and the hearing device housing  100  comprises complementary coupling parts  140 ,  150 ,  240 ,  250  for detachable connection such that said cover is exchangeable, wherein the hearing device housing  100  is kept sealed when the cover is disconnected from it. In some aspects, an item no 2 concerns a hearing device  10  according to item no 1, wherein the cover  200  is exchangeable to another type of cover. In some aspects, an item no 3 concerns a hearing device  10  according to item no 1 or item no 2, wherein the cover  200  is exchangeable to another cover comprising another type of filter  210 . In some aspects, an item no 4 concerns a hearing device  10  according to item no 1 or item no 2, wherein the cover  200  and hearing device housing  100  are configured for creating a space therebetween such that at least a part of the filter  210  can be situated in the space created between cover and hearing device housing. In some aspects, an item no 5 concerns a hearing device  10  according to any preceding item, wherein at least a part of the filter  210  is provided in a void  220  in the cover  200 . In some aspects, an item no 6 concerns a hearing device  10  according to item no 5, wherein at least a third of the volume of the filter  210  is provided in a void  220  in the cover  200 . In some aspects, an item no 7 concerns a hearing device  10  according to item no 5 or no 6, wherein at least a third of the weight of the filter  210  is provided in a void  220  in the cover  200 . In some aspects, an item no 8 concerns a hearing device  10  according to any preceding item, wherein the complementary coupling parts  140 ,  150 ,  240 ,  250  comprise snap coupling means configured for detachably connecting the cover  200  and the hearing device housing  100 . In some aspects, an item no 9 concerns a hearing device  10  according to any preceding item, wherein the complementary coupling parts  140 ,  150 ,  240 ,  250  comprise an exchangeable locking pin  400 ,  410  configured for detachably connecting the cover  200  and the hearing device housing  100 . In some aspects, an item no 10 concerns a hearing device  10  according to any preceding item, wherein the complementary coupling parts  140 ,  150 ,  240 ,  250  are configured for engaging an exchangeable locking pin  400 ,  410  configured for detachably connecting the cover  200  and the hearing device housing  100  by engaging and locking into the complementary coupling parts. In some aspects, an item no 11 concerns a hearing device  10  according to any preceding item, wherein the cover  200  comprises first complementary coupling parts  240 ,  250 . In some aspects, an item no 12 concerns a hearing device  10  according to any preceding item, wherein the hearing device housing  100  comprises second complementary coupling parts  140 ,  150 . In some aspects, an item no 13 concerns a hearing device  10  according to any preceding item, wherein the cover  200  comprises flanges and/or sides and/or walls  230  configured for fitting to the hearing device housing  100  such that at least a part  160  of the hearing device housing can be enclosed by said flanges and/or sides and/or walls. In some aspects, an item no 14 concerns a hearing device  10  according to any of items no 1 to 12, wherein the hearing device housing  100  comprises flanges and/or sides and/or walls  160  configured for fitting to the cover  200  such that at least a part  230  of the cover can be enclosed by said flanges and/or sides and/or walls. In some aspects, an item no 15 concerns a hearing device  10  according to any preceding item, wherein a sealing  130  is provided for watertight connection between the cover  200  and the hearing device housing  100 . In some aspects, an item no 16 concerns a hearing device  10  according to item no 15, wherein the sealing  130  comprises silicone. In some aspects, an item no 17 concerns a hearing device  10  according to item no 11 or no 12, wherein the hearing device housing  100  comprises holes  180  being configured for alignment with similar holes  260  provided in the cover  200  such that said cover is able to be detachably locked with said hearing device housing by means of an exchangeable locking pin  400 ,  410  configured for engaging and locking into the holes  180 ,  260 . In some aspects, an item no 18 concerns a hearing device  10  according to item no 13 or no 14, wherein the complementary coupling parts  140 ,  150 ,  240 ,  250  comprise holes  260  situated in the flanges and/or sides and/or walls  160 ,  230 , said holes being configured for alignment with similar holes  180  provided in the at least one enclosed part such that said cover  200  is able to be detachably locked with said hearing device housing  100  by enabling for an exchangeable locking pin  400 ,  410  to engage and lock into the holes  180 ,  260 . In some aspects, an item no 19 concerns a hearing device  10  according to item no 17 or no 18, wherein the holes  180 ,  260  and the exchangeable locking pin  400 ,  410  configured for detachably connecting said cover  200  and said hearing device housing  100  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 F 1  adapted to keep the locking pin in place during normal use of the hearing device  10 . In some aspects, an item no 20 concerns a hearing device  10  according to any of preceding items, wherein the complementary coupling parts  140 ,  150 ,  240 ,  250  comprise at least two sets of different coupling parts, one part being a hook-like member  250  and a thereto adapted member  150  such that movement between the cover  200  and hearing device housing  100  is limited when connected by the one part, and a second part  140 ,  240  complementing the one part  150 ,  250  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. In some aspects, an item no 21 concerns a hearing device  10  according to any of preceding items, wherein the cover  200  comprises an user interface  300  configured for controlling power source  190  of the hearing device for its operation. In some aspects, an item no 22 concerns a hearing device  10  according to item no 21, wherein the user interface is a button  300  being movably connected to the cover  200  such that the button is operatively connected to the hearing device  10  and its power source  190  when the cover is detachably connected to the hearing device housing  100 . In some aspects, an item no 23 concerns a hearing device  10  according to item no 22, wherein the button  300  is operatively connected to the hearing device  10  and its power source  190  via at least a part of the sealing  130  of the hearing device housing  100 . In some aspects, an item no 24 concerns a hearing device  10  according to any of the preceding items, wherein the sealing  130  of the hearing device housing  100  is provided by a silicone membrane. In some aspects, an item no. 25 concerns a tool  20  for exchanging a cover  200  of a hearing device  10  comprising a hearing device housing  100 . The tool  20  comprises a handle having a first fixed pin  21  for pushing out a locking pin  400 . The locking pin  400  detachably connects the cover and hearing device housing. The handle further comprises a second detachable pin  410 , which can replace the locking pin  400 , thereby detachably mating the cover and hearing device housing. In some aspects, an item no 26 concerns a tool  20  for exchanging a cover  200  of hearing device  10  according to item no 25, wherein the locking pin  400  and the second detachably pin  410  are essentially identical in dimension. In some aspects, an item no 27 concerns a tool  20  changing a cover  200  of a hearing device  10  according to item no 25 or no 26, wherein locking pin  400  and second detachably pin  410  are made of the same material. In some aspects, an item no. 28 concerns a system  1  comprising a hearing device  10  according to any of items no. 9 to 24 and a tool  20  for exchanging a cover  200  of the hearing device. The tool  20  comprising a handle having a first fixed pin  21  for pushing out the locking pin  400 . The locking pin  400  detachably mating the cover and hearing device housing  100 . The tool handle further comprises a second detachable pin  410  being configured for replacing the locking pin and thereby detachably mating cover and hearing device housing. In some aspects, an item no 29 concerns a system  1  comprising a hearing device  10  according to item no 28 when dependent on item no 20 or according to any of items no 21 to 24 when dependent on item no. 20, wherein said second detachable pin  410  is attached to said tool handle by a second friction force F 2 . In some aspects, an item no 30 concerns a system  1  according to item no 29, wherein the second friction force F 2  is lower than the first friction force F 1 . In some aspects, an item no. 31 concerns a system  1  according to item no 29 or no 30, wherein the second friction force F 2  is greater than the gravitational force acting on the locking pin  410 . In some aspects, an item no. 32 concerns a system  1  according to any of items no 28 to 31, wherein the handle of the tool  20  comprises a holder and/or bushing  23  for the second detachable pin  410 . In some aspects, an item no. 33 concerns a system  1  according to item no. 32, wherein the bushing  23  is made of plastic and/or rubber. In some aspects, an item no 34 concerns a tool  20  according to any of items no 25 to 27, wherein the second detachable pin  410  is attached to the tool handle by a second friction force F 2 . In some aspects, an item no. 35 concerns a tool  20  according to item no. 34, wherein the second friction force F 2  is lower than the first friction force F 1 . In some aspects, an item no 36 concerns a tool  20  according to item no 35, wherein the second friction force F 2  is greater than the gravitational force acting on the second detachable pin  410 . In some aspects, an item no 37 concerns a tool  20  according to any of items no 34 to 36, wherein the tool handle comprises a holder/bushing  23  for the second detachable pin  410 . In some aspects, an item no. 38 concerns a tool  20  according to any of items no 34 to 37, wherein the tool  20  comprises a detachable protection cap  22  configured for covering the second detachable pin  410  and/or the first fixed pin  21  when attached to the tool handle. In some aspects, an item no. 39 concerns a tool  20  according to item no. 38, wherein the detachable protection cap  22  is transparent. In some aspects, an item no. 40 concerns a tool  20  according to any of items no. 34 to no. 39, wherein the tool  20  is elongated. In some aspects, an item no. 41 concerns a tool  20  according to any of items no. 34 to no. 40, wherein the first fixed pin  21  is situated with its longitudinal axis in parallel with the longitudinal axis of the tool  20 . In some aspects, an item no. 42 concerns a tool  20  according to any of items no. 34 to no. 41, wherein the second detachable pin  410  is situated with its longitudinal axis in parallel with the longitudinal axis of the tool  20  when attached to the tool handle. In some aspects, an item no. 43 concerns a tool  20  according to any of items no. 34 to no. 42, wherein the first fixed pin  21  and the second detachable pin  410  are situated at opposite ends  20 A,  20 B of the tool handle. A system may be provided, which comprises a hearing device  10  with improved sealing and a tool  20  providing easy exchange of one or more covers  200  and/or one or more filters  210  and/or one or more sealings  130  in/on the hearing device, and the tool itself. 
     NOMENCLATURE 
     
         
           1 : Hearing device system comprising a hearing device  10  with exchangeable audio filter  210  and a separate tool/handle  20  for exchanging said audio filter/-s. 
           10 : Hearing device 
           20 : Tool/Handle for exchanging locking pins.  20 A: First tool/handle end.  20 B: Second tool/handle end.  21 : Fixed push pin on tool/handle.  22 : Detachable cap/lid on tool/handle. 
           23 : Holder/Receiver for locking pin.  24 : Interface/Surface for engaging/pushing locking pin. 
           25 : Outer radial ribs of the tool. 
           100 : Hearing device housing.  110 : Microphone.  120 : Audio channel.  130 : Sealing.  140 : First coupling part of hearing device housing part.  150 : Second coupling part of hearing device housing part.  160 : Mating/Upper/Top interface/part/flanges/sides/walls of housing part.  170 : Lower/Outer enclosure/part of housing part.  180 : Locking hole/-s.  190 : Power source, e.g. a battery. 
           200 : Hearing device housing lid/cover.  210 : Filter.  220 : Void/Cavity for receiving/holding filter.  230 : Flanges/Sides/Walls of cover.  240 : First coupling member of hearing device housing cover.  250 : Second coupling member of hearing device housing cover.  260 : Locking hole/-s. 
           300 : Control unit/Knob 
           400 : First/Detachable/Exchangeable/Replaceable locking pin 
           410 : Second/Detachable/Exchangeable/Replaceable pin for locking 
         I: Symbolises directions of assembly and/or assembling/connecting/mounting entities 
         II: Symbolises directions of disassembly and/or disassembling/removing/detaching entities 
         F 1 : First friction force F 1  adapted to keep a locking pin in place locked into at least one of the holes  180 ,  260  during normal use of the hearing device after assembly 
         F 2 : Second friction force F 2  adapted to provide detachable holding of the reserve/substitute locking pin  410  by means of the tool  20