Patent Description:
Earpieces are used in a large variety of situations, where an audio signal is presented to the user via the earpiece. Further, earpieces are used in communication systems for presenting to and/or receiving audio signals from the user.

In two-part hearing devices with an earpiece and an external device, the earpiece is connected to the external device by a cable comprising one or more wires and/or a sound guiding channel.

Earpieces for hearing devices are typically worn for many hours and therefore wearing comfort is of key importance for a hearing device user, especially with the varying ear canal sizes of different users. Venting of the ear canal when the earpiece is arranged in the ear canal has proven to be a desired feature e.g., to avoid or reduce occlusion effects. On the other hand, a closed or sealed ear canal may be desired in different user situations.

Patent publications <CIT>, <CIT>, <CIT>, and <CIT> show ear-tip structures having a housing with a receiver and a dedicated speaker output channel and in addition thereto a dome structure, where a vent is formed having a first opening in a proximal end of the housing closest to the ear drum and a second opening in a lateral direction of the housing.

Accordingly, there is a need for hearing devices and methods with improved fit and sound quality.

An earpiece for a hearing device for insertion into an ear canal of a user and having a longitudinal axis is disclosed as defined in claim <NUM>.

The earpiece comprises an earpiece part comprising an earpiece housing having a distal end, a proximal end, and an outer surface connecting the distal end to the proximal end. The earpiece housing comprises a first primary vent aperture and/or a second primary vent aperture in the outer surface. The earpiece part optionally comprises a receiver arranged within the earpiece housing. The earpiece comprises a dome for securing the earpiece in the ear canal. The dome has an inner surface extending circumferentially along the outer surface of the earpiece housing. The dome comprises a proximal surface optionally having a first primary vent aperture. The earpiece comprises a vent path optionally forming a fluid communication between the first primary vent aperture of the dome and the second primary vent aperture of the earpiece housing via the first primary vent aperture of the earpiece housing.

It is an important advantage of the hearing device that a size of the earpiece can be reduced thereby increasing the wearing comfort to a user. By placing the vent apertures, such as the first primary vent aperture and the second primary vent aperture in the outer surface of the earpiece housing, the dimensions of the proximal end of the earpiece housing, such as of a sound outlet from the earpiece housing may be reduced. This can allow for ease of fit with a user. Further, reducing the size of the proximal end of the earpiece housing facilitates insertion and withdrawal of the earpiece from an ear of the user. Furthermore, the risk of the earpiece and/or parts of the earpiece getting stuck inside the ear is reduced. This also allows for an improved form factor of the earpiece and/or the dome which can increase the wearing comfort to a user of the earpiece.

Previous hearing device solutions typically provide venting through the sound outlet on the proximal end of an earpiece housing. In order to provide sufficient venting, the proximal end of the earpiece housing may be of a relatively large size and may thus not fit properly in small ear canals. Since the proximal end of the earpiece housing, such as the sound outlet, is not required to accommodate vent apertures in the disclosed earpiece, the size of the proximal end of the earpiece housing can be reduced. The disclosed earpiece may thus be more accommodating and easier to insert and withdraw to those users with smaller ear canals.

The earpiece of the present disclosure further reduces the risk of vent channels and/or vent mechanisms of the earpiece clogging up. This may e.g., be caused by cerumen entering the earpiece housing through the vent apertures in the earpiece housing. By providing vent apertures in the dome for connecting the vent apertures in the earpiece housing with the ear canal of the user, cerumen entering the vent apertures from the ear canal will enter the vent apertures in the dome from where it is easily removable, e.g., by removing the dome from the earpiece housing and cleaning or replacing the dome. Thus, by providing vent apertures in the dome, the risk of the vent apertures in the earpiece housing getting clogged is reduced, which reduces the risk of the vent mechanism getting clogged, which may otherwise lead to reduced functionality or a malfunction of the earpiece.

Thus, the earpiece of the present disclosure allows for improved sizing, improved comfort to a user, and improved sound quality.

Providing the dome for the earpiece with a first primary vent aperture being in communication with the cavity formed by the inner surface, enables the first primary vent aperture of the earpiece housing to be arranged in the outer surface of the earpiece housing while being in fluid communication with a proximal side of the earpiece. Thus, the dome according to the current disclosure enables a size reduction of the proximal end of the earpiece housing, thereby enabling an improved form factor of the earpiece which can increase the wearing comfort to a user of the earpiece. The dome of the present disclosure further reduces the risk of vent channels and/or vent mechanisms of the earpiece clogging up. By providing the first primary vent aperture in the dome, cerumen entering the vent apertures from the ear canal will enter the vent apertures in the dome, instead of vent apertures in the earpiece housing, from where it can easily be removed. Thus, by providing vent apertures in the dome, the risk of the vent apertures in the earpiece housing getting clogged is reduced, which reduces the risk of the vent mechanism getting clogged, which may otherwise lead to reduced functionality or a malfunction of the earpiece.

Also, a hearing device comprising an earpiece as described herein is provided.

The above and other features and advantages of the present invention will become readily apparent to those skilled in the art by the following detailed description of exemplary embodiments thereof with reference to the attached drawings, in which:.

An earpiece for a hearing device is disclosed. The hearing device may be configured to be worn at an ear of a user and may be a hearable or a hearing aid, wherein the processor is configured to compensate for a hearing loss of a user. The hearing device may be of the behind-the-ear (BTE) type, in-the-ear (ITE) type, in-the-canal (ITC) type, receiver-in-canal (RIC) type, receiver-in-the-ear (RITE) type, and/or microphone-and-receiver-in-ear (MaRie) type.

The earpiece is configured for insertion into an ear canal of a user and has a longitudinal axis. The earpiece comprises an earpiece part comprising an earpiece housing having a distal end, a proximal end, and an outer surface connecting the distal end to the proximal end. The proximal end is the end closest to an ear drum of the user when the earpiece is inserted into the ear of the user. The distal end is the end furthest away from an ear drum of the user when the earpiece is inserted into the ear of the user.

The earpiece housing comprises a first primary vent aperture and/or a second primary vent aperture in the outer surface, such as in the outer surface of the earpiece housing. The first primary vent aperture and the second primary vent aperture allow air to flow through the outer surface of the earpiece housing, such that air can enter or leave the earpiece housing through the first primary vent aperture and the second primary vent aperture.

The earpiece part comprises a receiver arranged within the earpiece housing. The receiver is configured for providing an audio output signal to an ear canal when the earpiece is inserted into the ear canal. The receiver has a receiver axis. The receiver axis may be a longitudinal center axis of the receiver. The receiver may comprise a receiver membrane. The receiver axis may be perpendicular to a normal of the receiver membrane.

The earpiece comprises a dome for securing the earpiece in the ear canal. The dome has an inner surface extending circumferentially along the outer surface of the earpiece housing. The dome comprises a proximal surface optionally having a first primary vent aperture. The proximal surface of the dome is a surface of the dome facing the ear drum when the earpiece is inserted into the ear canal of the user. The earpiece comprises a vent path forming a fluid communication between the first primary vent aperture of the dome and the second primary vent aperture of the earpiece housing via the first primary vent aperture of the earpiece housing and/or between the second primary vent aperture of the dome and the second primary vent aperture of the earpiece housing.

The vent path allows air to flow through at least a part of the earpiece housing, such as from a proximal end of the earpiece housing to a distal end of the earpiece housing and/or from the distal end of the earpiece housing to the proximal end of the earpiece housing. By routing the vent path through the dome, such that the vent apertures in the dome constitute the outer part of the vent path being in contact with the ear canal, the vent apertures and/or the vent mechanism arranged in the earpiece housing clogging up is prevented, since any cerumen entering the vent path from the ear canal will be caught in the dome of the earpiece. The dome of the earpiece can be easily be removed from the earpiece housing and may be cleaned or replaced. Thereby a degradation of the sound quality and subsequently a malfunction of the hearing device may be prevented. In one or more example earpieces, the dome may comprise additional vent apertures, such as first and second tertiary vent apertures, first and second quaternary vent apertures, etc. The first tertiary vent apertures, the first quaternary vent apertures and/or any further first vent apertures may be in fluid communication with the first vent groove. The first tertiary vent apertures, the first quaternary vent apertures and/or any further first vent apertures may be arranged on the proximal surface of the dome. The second tertiary vent apertures, the second quaternary vent apertures and/or any further second vent apertures may be in fluid communication with the second vent groove. The second tertiary vent apertures, the second quaternary vent apertures and/or any further second vent apertures may be arranged on the distal surface of the dome. The vent apertures may be evenly distributed around the proximal surface and/or the distal surface of the dome. The angular distance between the first vent apertures arranged on the proximal surface of the dome may be <NUM>/M degrees, where M is the number of first vent apertures arranged on the proximal surface of the dome. The angular distance between the second vent apertures arranged on the distal surface of the dome may be <NUM>/N degrees, where N is the number of second vent apertures arranged on the distal surface of the dome. In one or more example domes, N and M are equal. In one or more example domes, N and M are different.

The earpiece housing may have a sound outlet at the proximal end of the earpiece housing. The proximal end of the earpiece comprising the sound outlet may herein also be referred to a nozzle or a nozzle element. The nozzle element may have a cylindrical shape. The sound outlet may be an aperture in the earpiece housing, e.g. in proximal end surface of the earpiece housing. The sound outlet may be separate from the first vent aperture(s), such as first primary vent aperture and/or first secondary vent aperture, of the earpiece housing. The sound outlet may have an outlet area, the outlet area having a normal. The normal of the outlet area of the sound outlet may in one or more exemplary earpieces be arranged parallel to a longitudinal axis of the earpiece and/or of the earpiece housing. The outlet area may in one or more example earpieces correspond to a base area of the nozzle element. In one or more exemplary earpieces, the normal of the outlet area of the sound outlet may be arranged at an angle larger than <NUM> to the longitudinal axis of the earpiece and/or of the earpiece housing. Previously, earpiece housings were typically vented through the sound outlet of the earpiece housing, such that the sound outlet constituted and/or comprised the first primary vent aperture of the earpiece housing. However, having the first primary vent aperture in the sound outlet may require that the sound outlet is of a size allowing for both sound to be emitted and air to flow into the earpiece housing via the sound outlet. Increasing the size of the sound outlet of the housing brings with it an increase of the outer dimensions of the earpiece housing, which may cause discomfort for a user of the earpiece. By arranging the primary vent apertures, such as the first primary vent aperture and the second primary vent aperture, in the outer surface of the earpiece housing as disclosed herein, in other words separate from the sound outlet, the size of the proximal end of the earpiece housing, such as of the nozzle element, may be reduced. The sound outlet and/or the proximal part of the earpiece housing may in one or more example earpieces be configured to hold a filter device for preventing cerumen from entering the sound outlet. Thereby, the sound outlet may be prevented from clogging up, which could otherwise cause a degradation of the sound quality and subsequently a malfunction of the hearing device.

In one or more example earpieces, the inner surface of the dome comprises a first vent groove configured to be or being in fluid communication with the first primary vent aperture in the dome. The first vent groove may be aligned with the first primary vent aperture in the earpiece housing along the longitudinal axis, such as the longitudinal axis of the earpiece housing. The first vent groove may be circumferentially arranged along the inner surface of the dome. The first vent groove may have a first depth, e.g., in the range from <NUM> to <NUM>. The first vent groove may extend fully or partly along the circumference of the inner surface. The first vent groove may extend perpendicular to the longitudinal axis. By providing the inner surface of the dome with the first vent groove, fluid connection between the first primary vent aperture (and/or further first vent apertures) in the earpiece housing and the first vent groove is ensured when the dome is correctly aligned with the earpiece housing along the longitudinal axis, without requiring an alignment of the dome with the earpiece housing in an angular direction. Thereby, an easy mounting or alignment of the dome to the earpiece housing is facilitated.

In one or more example earpieces, the proximal surface of the dome has a first secondary vent aperture. The first secondary vent aperture may be in fluid communication with the first vent groove. The first secondary vent aperture allows a fluid, such as air, to flow from the proximal side of the dome to the first vent groove and/or from the first vent groove to the proximal side of the dome.

In one or more example earpieces, the dome comprises a distal surface having a second primary vent aperture in a distal surface. The second primary vent aperture in the dome may be arranged to be in fluid communication with the second primary vent aperture in the earpiece housing. The first secondary vent aperture allows a fluid, such as air, to flow from the second primary vent aperture in the earpiece housing to a distal side of the dome or vice versa.

In one or more example earpieces, the vent apertures of the dome, such as the first primary vent aperture and/or the second primary vent aperture and/or the first secondary vent aperture and/or the second secondary vent aperture may be configured to hold a filter device, such as a respective filter device, for preventing cerumen from entering the vent apertures of the dome. Thereby, the vent apertures of the dome may be prevented from clogging up, which could otherwise cause a degradation of the sound quality and subsequently a malfunction of the hearing device. Arranging filter devices in the vent apertures of the dome also reduces the risk of the vent apertures, such as the first primary and the second primary vent apertures in the earpiece housing from clogging up, since cerumen is prevented from reaching the vent apertures in the earpiece housing via the vent apertures in the dome.

In one or more example earpieces, the inner surface of the dome comprises a second vent groove being in fluid communication with the second primary vent aperture of the dome. The second vent groove may be aligned with the second primary vent aperture in the earpiece housing along the longitudinal axis. The second vent groove may be circumferentially arranged along the inner surface of the dome. The second vent groove may be arranged distal to the first vent groove. The second vent groove may have a second depth, e.g., in the range from <NUM> to <NUM>. The second depth may be the same or greater or smaller than the first depth. The second vent groove may extend fully or partly along the circumference of the inner surface. The second vent groove may extend perpendicular to the longitudinal axis. By providing the inner surface of the dome with the second vent groove, fluid connection between the second primary vent aperture (and/or further second vent apertures) in the earpiece housing and the second vent groove is ensured when the dome is correctly aligned with the earpiece housing along the longitudinal axis, without requiring an alignment of the dome with the earpiece housing in an angular direction. Thereby, an alignment of the dome to the earpiece housing is facilitated.

In one or more example earpieces, the outer surface of the earpiece housing comprises a first vent groove being in fluid communication with the first primary vent aperture of the earpiece housing. The first vent groove may be aligned with the first primary vent aperture in the dome along the longitudinal axis. The first vent groove may be circumferentially arranged along the outer surface of the earpiece housing. By providing the outer surface of the earpiece housing with the first vent groove, fluid connection between the first primary vent aperture in the dome and the first vent groove in the earpiece housing is ensured when the dome is correctly aligned with the earpiece housing along the longitudinal axis, without requiring an alignment of the dome with the earpiece housing in an angular direction. Thereby, an alignment of the dome to the earpiece housing is facilitated.

In one or more example earpieces, the outer surface of the earpiece housing comprises a second vent groove being in fluid communication with the second primary vent aperture of the earpiece housing. The second vent groove may be aligned with the second primary vent aperture in the dome along the longitudinal axis. The second vent groove may be circumferentially arranged along the outer surface of the earpiece housing. The second vent groove of the earpiece housing may be arranged distal to the first vent groove of the earpiece housing. By providing the outer surface of the earpiece housing with the second vent groove, fluid connection between the second primary vent aperture in the dome and the second vent groove in the earpiece housing is ensured when the dome is correctly aligned with the earpiece housing along the longitudinal axis, without requiring an alignment of the dome with the earpiece housing in an angular direction. Thereby, an alignment of the dome to the earpiece housing is facilitated and a correct functioning of the vent mechanism can be ensured.

In one or more example earpieces, the outer surface of the earpiece housing comprises a first protrusion, optionally wherein the first vent aperture(s) of the earpiece housing is formed in the first protrusion. The first protrusion may be aligned with the first vent groove of the inner surface of the dome along the longitudinal axis. The first protrusion may have a first height, e.g., in the range from <NUM> to <NUM>. The first height of the first protrusion may be less than the first depth of the first vent groove in the dome to ensure fluid communication via the first groove in the dome. The first protrusion may be circumferentially arranged along the outer surface of the earpiece housing. The first protrusion may extend fully or partly along the circumference of the outer surface. The first protrusion may extend perpendicular to the longitudinal axis. By providing the outer surface of the earpiece housing with the first protrusion, the dome may be further secured to the earpiece housing. The first protrusion may comprise a plurality of first protrusion parts arranged along the circumference of the outer surface in the first position.

In one or more example earpieces, the outer surface of the earpiece housing comprises a second protrusion, optionally wherein the second vent aperture(s) of the earpiece housing is formed in the second protrusion. The second protrusion may be aligned with the second vent groove of the inner surface of the dome along the longitudinal axis. The second protrusion may have a second height, e.g., in the range from <NUM> to <NUM>. The second height of the second protrusion may be less than the second depth of the second vent groove in the dome to ensure fluid communication via the second groove in the dome. The second protrusion may be circumferentially arranged along the outer surface of the earpiece housing. The second protrusion may extend fully or partly along the circumference of the outer surface. The second protrusion may extend perpendicular to the longitudinal axis. By providing the outer surface of the earpiece housing with the second protrusion, the dome may be further secured to the earpiece housing. The second protrusion may comprise a plurality of second protrusion parts arranged along the circumference of the outer surface in the second position.

In one or more example earpieces, the distal surface of the dome has a second secondary vent aperture in fluid communication with the second vent groove of the inner surface of the dome and/or of the outer surface of the earpiece housing. Thus, the second secondary vent aperture may be in fluid communication with the second vent aperture of the earpiece housing via the second vent groove.

According to the invention, the first primary vent aperture of the earpiece housing is proximal to the second primary vent aperture of the earpiece housing. In other words, the first primary vent aperture is arranged at a first distance from the proximal end of the earpiece housing and the second vent aperture is arranged at a second distance from the proximal end of the earpiece housing. The second distance is larger than the first distance.

In one or more example earpieces, the earpiece part comprises a vent mechanism arranged in the earpiece housing, and wherein the vent mechanism is arranged between the first primary vent aperture and the second primary vent aperture of the earpiece housing and configured to open and close the vent path.

The vent mechanism may be an active vent mechanism. The vent mechanism being active can herein be seen as the vent mechanism being configured to open and close a vent path (such as a vent pathway, an air path, a sound path, a fluid path, and/or a fluid communication). The vent mechanism can be configured to be open in a first state. The vent mechanism can be configured to be closed in a second state.

The vent mechanism may comprise one or more movable components. The opening and closing of the vent mechanism may be done by moving one or more of the movable components of the vent mechanism. The vent mechanism may comprise an actuator for moving the one or more movable components of the vent mechanism. The actuator may be a magnetic actuator, such as a microelectromechanical systems (MEMS) magnetic actuator and or an electrical actuator.

The vent path can pass at least partially through the earpiece housing. The vent mechanism can comprise any mechanical mechanism that opens and closes the vent path. In one or more exemplary earpieces, the vent mechanism may be operated electronically and/or automatically and/or manually and/or mechanically. The opening and closing of the vent mechanism may not be audible to the user.

In one or more exemplary earpieces, the vent mechanism can include a circumferential rim extending around an inner surface of the earpiece housing. The circumferential rim may be a part of the earpiece housing. The circumferential rim may be attached to the earpiece housing. The circumferential rim may form an aperture (e.g., hole, empty space, opening, gap) within the earpiece housing. The circumferential rim may include mating features.

In some example vent mechanisms, the vent mechanism may include a plug that can move in the earpiece housing. For example, the plug can move longitudinally along the longitudinal axis of the earpiece. The plug can form an airtight seal with the circumferential rim when in the closed position, thus closing a vent path. When the plug is moved away from the circumferential rim, regardless of the type of motion, the vent path may be opened. The plug may have a diameter greater than the inner diameter of the circumferential rim. The plug may be flat. The plug may include an extension that fits within an aperture in the circumferential rim. The plug may include corresponding mating features to mate with the mating features of the circumferential rim. The plug and/or circumferential rim may include a sealing material for improving sealing between the plug and circumferential rim.

Other vent mechanisms can be used as well, and the particular vent mechanism is not limiting. For example, the vent mechanism can include rotational components. Alternatively, the vent mechanism can include translational components. In one or more exemplary earpieces, the vent mechanism can include both rotational and translatable components.

The vent mechanism is generally used to open and close the vent path. When the vent mechanism is open, the vent mechanism allows air to flow through the earpiece between a proximal end and a distal end of the earpiece. When closed, the vent mechanism prevents air from flowing through the vent path in the earpiece, e.g., between a proximal end and a distal end of the earpiece and/or between a distal side and a proximal side of the vent mechanism. Thus, the vent mechanism can prevent fluid communication when closed. This can advantageously allow for improved sound quality when a user is for example listening to music. For example, the vent mechanism can be closed so that the user can experience improved bass hearing, in particular during music playback. However, this may reduce the sound received from the environment when the vent is closed. However, when the user desires to hear the surrounding environment, the vent mechanism can be opened to avoid undesired occlusion effects.

In one or more example earpieces, the earpiece housing comprises a flange arranged at the proximal end of the earpiece housing for securely attaching the dome to the earpiece housing. The flange may be configured to secure the dome in a longitudinal direction of the earpiece. In one or more example earpieces, the flange may be arranged circumferentially along the outer surface of the earpiece housing. In one or more example earpieces, the flange may be arranged along a section of the outer surface of the earpiece housing. The dome may comprise a corresponding groove for receiving the flange arranged at the proximal end of the earpiece housing.

The hearing device may be configured for wireless communication with one or more devices, such as with another hearing device, e.g., as part of a binaural hearing system, and/or with one or more accessory devices, such as a smartphone and/or a smart watch. The hearing device optionally comprises an antenna for converting one or more wireless input signals, e.g., a first wireless input signal and/or a second wireless input signal, to antenna output signal(s). The wireless input signal(s) may origin from external source(s), such as spouse microphone device(s), wireless TV audio transmitter, and/or a distributed microphone array associated with a wireless transmitter. The wireless input signal(s) may origin from another hearing device, e.g., as part of a binaural hearing system, and/or from one or more accessory devices.

The hearing device optionally comprises a radio transceiver coupled to the antenna for converting the antenna output signal to a transceiver input signal. Wireless signals from different external sources may be multiplexed in the radio transceiver to a transceiver input signal or provided as separate transceiver input signals on separate transceiver output terminals of the radio transceiver. The hearing device may comprise a plurality of antennas and/or an antenna may be configured to be operate in one or a plurality of antenna modes. The transceiver input signal optionally comprises a first transceiver input signal representative of the first wireless signal from a first external source.

The hearing device comprises a set of microphones. The set of microphones may comprise one or more microphones. The set of microphones comprises a first microphone for provision of a first microphone input signal and/or a second microphone for provision of a second microphone input signal. The set of microphones may comprise N microphones for provision of N microphone signals, wherein N is an integer in the range from <NUM> to <NUM>. In one or more exemplary hearing devices, the number N of microphones is two, three, four, five or more. The set of microphones may comprise a third microphone for provision of a third microphone input signal. The set of microphones may be arranged in the earpiece housing of the earpiece and/or in a secondary earpiece housing, such as in an earpiece housing arranged behind the ear of a user.

The hearing device optionally comprises a pre-processing unit. The pre-processing unit may be connected to the radio transceiver for pre-processing the transceiver input signal. The pre-processing unit may be connected the first microphone for pre-processing the first microphone input signal. The pre-processing unit may be connected the second microphone if present for pre-processing the second microphone input signal. The pre-processing unit may comprise one or more A/D-converters for converting analog microphone input signal(s) to digital pre-processed microphone input signal(s).

The hearing device comprises a processor for processing input signals, such as pre-processed transceiver input signal and/or pre-processed microphone input signal(s). The processor provides an electrical output signal based on the input signals to the processor. Input terminal(s) of the processor are optionally connected to respective output terminals of the pre-processing unit. For example, a transceiver input terminal of the processor may be connected to a transceiver output terminal of the pre-processing unit. One or more microphone input terminals of the processor may be connected to respective one or more microphone output terminals of the pre-processing unit.

The hearing device comprises a processor for processing input signals, such as pre-processed transceiver input signal(s) and/or pre-processed microphone input signal(s). The processor is optionally configured to compensate for hearing loss of a user of the hearing device. The processor provides an electrical output signal based on the input signals to the processor. Input terminal(s) of the processor are optionally connected to respective output terminals of the pre-processing unit. For example, a transceiver input terminal of the processor may be connected to a transceiver output terminal of the pre-processing unit. One or more microphone input terminals of the processor may be connected to respective one or more microphone output terminals of the pre-processing unit.

<FIG> shows a part of an exemplary earpiece part <NUM> for an earpiece of a hearing device. The earpiece part <NUM> has an earpiece axis X_E. The earpiece axis X_E may be a longitudinal axis of the earpiece part <NUM> and/or of the earpiece. The earpiece part <NUM> comprises an earpiece housing <NUM> having a proximal end <NUM>, a distal end <NUM>, and an outer surface <NUM> connecting the distal end <NUM> to the proximal end <NUM>. The proximal end <NUM> is the end closest to an ear drum <NUM> of the user when the earpiece <NUM> is inserted into the ear of the user. The distal end <NUM> is the end furthest away from the ear drum <NUM> of the user when the earpiece <NUM> is inserted into the ear of the user. The earpiece housing <NUM> comprises a first primary vent aperture <NUM>, such as one or more first primary vent apertures <NUM>, and a second primary vent aperture <NUM>, such as one or more first primary vent apertures <NUM>, in the outer surface <NUM>. The first primary vent aperture <NUM> of the earpiece housing <NUM> is proximal to the second primary vent aperture <NUM> of the earpiece housing <NUM>. In other words, the first primary vent aperture <NUM> is arranged closer to the ear drum <NUM> than the second primary vent aperture <NUM>, when the earpiece <NUM> is arranged in the ear of a user. The one or more first primary vent aperture(s) <NUM> are arranged at first distance from the proximal end <NUM> of the earpiece housing <NUM> and the one or more second vent aperture(s) <NUM> are arranged at a second distance from the proximal end <NUM> of the earpiece housing <NUM>. The second distance is larger than the first distance. The earpiece housing <NUM> has a sound outlet <NUM> at the proximal end <NUM> of the earpiece housing <NUM> and separate from the first vent apertures. The sound outlet <NUM> is in the example earpiece part <NUM> shown in <FIG> an aperture in the earpiece housing <NUM>, such as in the proximal end of the earpiece housing <NUM>. In the example earpiece part <NUM> shown in <FIG> the sound outlet <NUM> is arranged in a nozzle <NUM> of the earpiece housing <NUM>. The sound outlet <NUM> may have an outlet area, the outlet area having a normal. In the exemplary earpiece part shown in <FIG> the normal of the outlet area of the sound outlet <NUM> is arranged parallel to a longitudinal axis of the earpiece part <NUM> and/or of the earpiece housing <NUM>, such as parallel to the earpiece axis X_E.

The example earpiece part <NUM> shown in <FIG> comprises a vent mechanism <NUM> arranged between the first primary vent aperture <NUM> and the second primary vent aperture <NUM> of the earpiece housing <NUM>. The vent mechanism <NUM> may be configured to open and close the vent path <NUM> between the first primary vent aperture <NUM> and the second primary vent aperture <NUM>. When the vent mechanism <NUM> is open, the vent mechanism <NUM> allows air to flow through the earpiece part <NUM>, between a proximal end and a distal end of the earpiece <NUM>. When closed, the vent mechanism <NUM> prevents air from flowing through the vent path <NUM> in the earpiece part <NUM>, e.g., between a proximal end and a distal end of the earpiece part <NUM> and/or between a distal side and a proximal side of the vent mechanism <NUM>. Thus, when the vent mechanism <NUM> is closed the vent mechanism <NUM> prevents the first primary vent aperture <NUM> and the second primary vent aperture <NUM> from being in fluid communication.

The exemplary earpiece housing <NUM> shown in <FIG> comprises a flange <NUM> arranged at the proximal end <NUM> of the earpiece housing <NUM> for securely attaching a dome to the earpiece housing <NUM>. The flange <NUM> is configured to mate with a corresponding groove for receiving the flange <NUM> in the dome. The flange <NUM> is configured to secure the dome to the earpiece housing <NUM> in a longitudinal direction of the earpiece housing <NUM>. In one or more example earpieces, the flange <NUM> is arranged circumferentially along the outer surface <NUM> of the earpiece housing <NUM>. The flange <NUM> is arranged along a section of the outer surface <NUM> of the earpiece housing <NUM>. In the exemplary earpiece housing <NUM> shown in <FIG>, the flange <NUM> is arranged on the outer surface <NUM> at the proximal end of the earpiece housing <NUM>. The flange <NUM> is arranged on the earpiece housing <NUM> so that, when a dome with a corresponding groove for receiving the flange <NUM> is arranged on the earpiece housing <NUM>, the first primary vent aperture and/or the first vent groove of the dome is aligned and/or overlaps with the first primary vent aperture <NUM> of the earpiece housing <NUM> in a longitudinal direction of the earpiece housing <NUM>.

<FIG> shows an exemplary dome <NUM> for an earpiece of a hearing device. The dome <NUM> is configured for securing the earpiece in the ear canal of the user. The dome has a dome axis X_D. The dome axis X_D may be a longitudinal axis of the dome <NUM>. The dome <NUM> has an inner surface <NUM> configured to extend circumferentially along an outer surface of an earpiece housing of an earpiece housing part, such as along the outer surface <NUM> of the earpiece housing part <NUM> shown in <FIG>. The dome <NUM> comprises a proximal surface <NUM> having a first primary vent aperture 16A. The proximal surface <NUM> of the dome <NUM> is the surface of the dome <NUM> facing the ear drum <NUM> when the dome is arranged on an earpiece housing part and the earpiece is inserted into the ear canal of the user. The first primary vent aperture 16A of the dome <NUM> is configured to align with a first primary vent aperture in the earpiece housing when the dome <NUM> is arranged on the earpiece housing, so that a vent path forming a fluid communication between the first primary vent aperture 16A of the dome <NUM> and a first primary vent aperture of an earpiece housing is formed, such as the first primary vent aperture <NUM> of the earpiece housing <NUM> of the earpiece part <NUM> of <FIG>.

In the example dome <NUM> shown in <FIG>, the inner surface <NUM> of the dome <NUM> comprises a first vent groove <NUM> being in fluid communication with the first primary vent aperture 16A in the dome <NUM>. The first primary vent aperture 16A is a throughgoing hole and/or a channel in the dome <NUM>, extending from the proximal surface <NUM> of the dome <NUM> to the inner surface <NUM> of the dome <NUM>. The first primary vent aperture allows air to flow between the proximal surface <NUM> of the dome <NUM> to the inner surface <NUM> of the dome <NUM>. The first vent groove <NUM> is configured to be aligned with the first primary vent aperture in the earpiece housing along the longitudinal axis, such as along the earpiece housing axis X_EH. The first vent groove <NUM> is circumferentially arranged along the inner surface <NUM> of the dome <NUM>. By providing the inner surface <NUM> of the dome <NUM> with the first vent groove <NUM>, a fluid connection between the first primary vent aperture in the earpiece housing and the first vent groove <NUM> of the dome <NUM> can be ensured when the dome <NUM> is correctly aligned with the earpiece housing along the earpiece axis, without requiring an alignment of the dome <NUM> with the earpiece housing in an angular direction. Thereby, an alignment of the dome <NUM> to the earpiece housing is facilitated. The first vent groove <NUM> has a first depth. The first vent groove <NUM> may extend fully or partly along the circumference of the inner surface <NUM>. The first vent groove <NUM> extends perpendicular to the longitudinal axis, such as the dome axis X_D. The exemplary dome <NUM> further comprises secondary vent apertures <NUM>. In the example dome <NUM> shown in <FIG>, the proximal surface <NUM> of the dome <NUM> has a first secondary vent aperture 23A. The first secondary vent aperture 23A is in fluid communication with the first vent groove <NUM>. The first secondary vent aperture 23A allows a fluid, such as air, to flow from the proximal side of the dome <NUM>, such as from the proximal surface <NUM> of the dome <NUM> to the first vent groove <NUM> and/or from the first vent groove <NUM> to the proximal side of the dome <NUM>.

The exemplary dome <NUM> of <FIG> comprises a distal surface <NUM> having a second primary vent aperture 16B in the distal surface <NUM>. The second primary vent aperture 16B in the dome <NUM> is configured to be in fluid communication with the second primary vent aperture in the earpiece housing when the dome <NUM> is arranged on the earpiece housing. The second primary vent aperture 16B is configured to allow a fluid, such as air, to flow from the second primary vent aperture in the earpiece housing to a distal side of the dome <NUM> or vice versa. The distal surface <NUM> further has a second secondary vent aperture 23B in the distal surface <NUM>. The second secondary vent aperture 23B is configured to be in fluid communication with the second primary vent aperture in the earpiece housing when the dome <NUM> is arranged on the earpiece part <NUM>.

In the exemplary dome <NUM> of <FIG>, the inner surface <NUM> of the dome <NUM> comprises a second vent groove <NUM> being in fluid communication with the second primary vent aperture 16B of the dome <NUM>. The second vent groove <NUM> is configured to be aligned with the second primary vent aperture <NUM> in the earpiece housing along the longitudinal axis, when the dome is arranged on the earpiece housing part. The second vent groove <NUM> is circumferentially arranged along the inner surface <NUM> of the dome <NUM>. The second vent groove <NUM> is arranged distal to the first vent groove <NUM>. By providing the inner surface <NUM> of the dome <NUM> with the second vent groove <NUM>, fluid connection between the second primary vent aperture in the earpiece housing and the second vent groove <NUM> is ensured when the dome <NUM> is arranged on, and correctly aligned with, the earpiece housing along the longitudinal axis. The second vent groove <NUM> may have a second depth. The second depth may be the same or greater or smaller than the first depth of the first vent groove <NUM>. The second vent groove <NUM> may extend fully or partly along the circumference of the inner surface <NUM> of the dome <NUM>. The second vent groove <NUM> may extend perpendicular to the longitudinal axis, such as the dome axis X_D The exemplary dome <NUM> of <FIG> further comprises a groove <NUM> for receiving a flange arranged at a proximal end of the earpiece housing for securing the dome <NUM> to the earpiece housing <NUM>. The groove <NUM> is arranged circumferentially along the inner surface <NUM> of the dome <NUM>. The groove is arranged on the inner surface <NUM> of the dome <NUM>, such that when the dome <NUM> is arranged on the earpiece housing <NUM> and the flange is received in the groove <NUM>, the first primary vent aperture 16A and/or the first vent groove <NUM> is correctly aligned and in fluid communication with the first primary vent aperture of the earpiece housing <NUM>. Thus, an alignment of the dome <NUM> with the earpiece housing in an angular direction is not required to ensure fluid communication between the second primary vent apertures of the earpiece housing and the second primary vent aperture 16B in the dome <NUM>. Thereby, a mounting and aligning of the dome <NUM> to the earpiece housing is facilitated.

<FIG> shows an exemplary dome <NUM> for an earpiece of a hearing device seen from a proximal side along a longitudinal axis of the dome <NUM>. The dome <NUM> comprises a proximal surface <NUM> facing the ear drum of the user when the dome <NUM> is arranged on an earpiece housing and the earpiece is inserted into the ear canal of the user. In the exemplary dome <NUM> of <FIG>, the proximal surface <NUM> has a circular shape. The proximal surface <NUM> has the first primary vent aperture 16A and the first secondary vent aperture 23A. The first primary vent aperture 16A and the first secondary vent aperture 23A connect the proximal surface <NUM> with the inner surface <NUM> of the dome <NUM> for allowing fluid communication between the proximal surface <NUM> and the inner surface <NUM> of the dome <NUM>. The first primary vent aperture 16A may be in fluid communication with the first vent groove (not shown in <FIG>) being arranged circumferentially on the inner surface <NUM> of the dome <NUM>. The first secondary vent aperture 23A may be in fluid communication with the first vent groove (not shown in <FIG>) being arranged circumferentially on the inner surface <NUM> of the dome <NUM>. In the exemplary dome <NUM> shown in <FIG>, the first primary vent aperture 16A and the first secondary vent aperture 23A are evenly distributed around the circumference of the dome, such as arranged at a <NUM>-degree angle from each other.

<FIG> shows an exemplary dome <NUM> for an earpiece of a hearing device seen from a distal side along the longitudinal axis of the dome <NUM>. The dome <NUM> has an inner surface <NUM> forming a cavity 14A. The inner surface <NUM> is configured for extending circumferentially along an outer surface of an earpiece housing, such as around the outer surface <NUM> of the exemplary earpiece housings <NUM>, 5A, 5B or 5C shown in <FIG> and <FIG>. In other words, the cavity 14A is configured to accommodate at least a part of the earpiece housing, such as at least a part of the earpiece housing <NUM>, 5A, 5B, 5C. The dome <NUM> comprises a distal surface <NUM> facing away from the ear drum <NUM> of the user when the dome <NUM> is arranged on an earpiece housing and the earpiece is inserted into the ear canal of the user. In the exemplary dome <NUM> of <FIG>, the distal surface <NUM> has a circular shape. The distal surface <NUM> has the second primary vent aperture 16B and the second secondary vent aperture 23B. The second primary vent aperture 16B and the first secondary vent aperture 23B connect the distal surface <NUM> with the inner surface <NUM> of the dome <NUM> for allowing fluid communication between the distal surface <NUM> and the inner surface <NUM> of the dome <NUM>. The second primary vent aperture 16B can be in fluid communication with the second vent groove (not shown in <FIG>) being arranged circumferentially on the inner surface <NUM> of the dome <NUM>. The second secondary vent aperture 23B may be in fluid communication with the second vent groove (not shown in <FIG>) being arranged circumferentially on the inner surface <NUM> of the dome <NUM>. In the exemplary dome <NUM> shown in <FIG>, the second primary vent aperture 16B and the second secondary vent aperture 23B are evenly distributed around the circumference of the dome, such as arranged at a <NUM>-degree angle from each other.

<FIG> shows a part of an exemplary earpiece <NUM> for a hearing device. The earpiece <NUM> comprises an earpiece part <NUM> and a dome <NUM> in cross-section. The earpiece part <NUM> may be the earpiece part <NUM> shown in <FIG> and comprising an earpiece housing <NUM> having a distal end <NUM>, a proximal end <NUM>, and an outer surface <NUM> connecting the distal end <NUM> to the proximal end <NUM>. The proximal end <NUM> can herein be seen as the end closest to an ear drum of the user when the earpiece <NUM> is inserted into the ear of the user. The distal end <NUM> can herein be seen as the end furthest away from an ear drum of the user when the earpiece <NUM> is inserted into the ear of the user. The earpiece housing <NUM> comprises a first primary vent aperture <NUM> and a second primary vent aperture <NUM> in the outer surface <NUM>, such as in the outer surface of the earpiece housing. The first primary vent aperture <NUM> and the second primary vent aperture <NUM> allow fluid communication, such as air flow, through the outer surface <NUM> of the earpiece housing <NUM>, such that air can enter or leave the earpiece housing <NUM> through the first primary vent aperture <NUM> and the second primary vent aperture <NUM>. In the example earpiece <NUM> of <FIG>, the first primary vent aperture <NUM> is arranged proximal to the second primary vent aperture <NUM>. The earpiece part <NUM> comprises a receiver <NUM> arranged within the earpiece housing <NUM>. The receiver <NUM> has a receiver axis X_R. The receiver axis X_R may be a longitudinal center axis of the receiver <NUM>. The receiver <NUM> may comprise a receiver membrane. The receiver axis X_R may be perpendicular to a normal of the receiver membrane. The earpiece <NUM> comprises a dome <NUM> for securing the earpiece in the ear canal, such as the dome <NUM> shown in <FIG>. The dome <NUM> is arranged on the arranged on the proximal end <NUM> of the earpiece part <NUM>. The dome <NUM> has an inner surface <NUM> extending circumferentially along the outer surface <NUM> of the earpiece housing <NUM>. The dome <NUM> comprises a proximal surface <NUM> having a first primary vent aperture 16A and a first secondary vent aperture 23A. The earpiece <NUM> comprises a vent path <NUM> forming a fluid communication between the first primary vent aperture 16A and/or the first secondary vent aperture 23A of the dome <NUM> and the second primary vent aperture <NUM> of the earpiece housing <NUM> via the first primary vent aperture <NUM> of the earpiece housing <NUM>. The vent path <NUM> allows air to flow through at least a part of the earpiece housing <NUM>, such as from the proximal end <NUM> of the earpiece housing to a distal end <NUM> of the earpiece housing and/or from the distal end <NUM> of the earpiece housing to the proximal end <NUM> of the earpiece housing. In other words, when the earpiece <NUM> is assembled the vent apertures in the dome <NUM> and in the earpiece part <NUM> form the vent path <NUM> of the earpiece <NUM>. The vent path <NUM> is thus routed through or extends through both the dome <NUM> and the earpiece part <NUM>. Air can thus flow from a proximal side of the earpiece <NUM> via the first primary vent aperture 16A and/or the first secondary vent aperture 23A in the dome <NUM>, through at least a part of the earpiece housing <NUM> via the first primary vent aperture <NUM> and the second primary vent aperture <NUM> of the earpiece housing <NUM>, to a distal side of the earpiece <NUM> via the second primary vent aperture 16B and/or the second secondary vent aperture 23B arranged in the distal surface <NUM> of the dome <NUM>. By routing the vent path <NUM> through the dome <NUM> via the first primary vent aperture <NUM>, the dimensions of the proximal end of the earpiece housing <NUM>, such as of the sound outlet of the earpiece housing, can be reduced. This can allow for ease of fit of the earpiece <NUM> with a user. Further, reducing the size of the proximal end of the earpiece housing <NUM> facilitates insertion and withdrawal of the earpiece <NUM> from an ear of the user, e.g., by provision of an improved attachment of the dome <NUM> to the earpiece housing <NUM>. Furthermore, the risk of the earpiece <NUM> and/or parts of the earpiece <NUM> getting stuck inside the ear can be reduced. Reducing, the size of the proximal end of the earpiece housing <NUM> also allows for an improved form factor of the earpiece <NUM> and/or the dome <NUM> which can increase the wearing comfort to a user of the earpiece <NUM>.

In the exemplary earpiece <NUM>, shown in <FIG>, the inner surface <NUM> of the dome <NUM> comprises the first vent groove <NUM>. The first vent groove <NUM> is in fluid communication with the first primary vent aperture 16A and the first secondary vent aperture 23A in the dome. The first vent groove <NUM> is aligned with, or at least overlaps with, and is in fluid communication with one or more first primary vent aperture(s) <NUM> in the earpiece housing <NUM> along the earpiece axis X_E. The first vent groove <NUM> is circumferentially arranged along the inner surface <NUM> of the dome <NUM>. Thereby, fluid connection between the first primary vent aperture <NUM> in the earpiece housing <NUM> and the first vent groove <NUM> is ensured when the dome <NUM> is correctly aligned with the earpiece housing <NUM> along the earpiece axis X_E, regardless of the angular position of the dome <NUM> on the earpiece housing <NUM>. Thereby, an alignment of the dome <NUM> to the earpiece housing <NUM> is facilitated. The inner surface <NUM> of the dome <NUM> further comprises the second vent groove <NUM> circumferentially arranged along the inner surface <NUM> of the dome <NUM>. The second vent groove <NUM> is aligned and in fluid communication with the second primary vent aperture(s) <NUM> in the earpiece housing <NUM> along the earpiece housing axis X_EH. The second vent groove <NUM> is in fluid communication with the second primary vent aperture 16B and the second secondary vent aperture 23B in the dome and thus provides fluid communication between the distal surface <NUM> of the dome <NUM> and the second primary vent aperture <NUM> of the earpiece housing.

The exemplary earpiece <NUM> shown in <FIG> comprises a vent mechanism <NUM> arranged in the earpiece housing <NUM>. The vent mechanism <NUM> is arranged between the first primary vent aperture <NUM> and the second primary vent aperture <NUM> of the earpiece housing <NUM>. And is configured to open and close the vent path <NUM>. In the exemplary earpiece shown in <FIG>, the earpiece housing <NUM> comprises the flange <NUM> arranged at the proximal end of the earpiece housing <NUM>. The flange <NUM> is arranged in the corresponding groove <NUM> of the dome <NUM>, so that the dome <NUM> is aligned with the earpiece housing <NUM>. When the dome <NUM> is aligned with the earpiece housing <NUM>, the first primary vent aperture 16A, the first secondary vent aperture 23A and/or the first vent groove <NUM> are aligned and in fluid communication with the first primary vent aperture <NUM> of the earpiece housing <NUM>. Correspondingly, the second primary vent aperture 16B, the second secondary vent aperture 23B and/or the second vent groove <NUM> are aligned and in fluid communication with the second primary vent aperture <NUM> of the earpiece housing <NUM>. The flange <NUM> thus secures the dome <NUM> to the earpiece part <NUM> in an aligned position in the longitudinal direction of the earpiece <NUM>.

<FIG> shows a part of an exemplary earpiece 3A. The earpiece 3A comprises an exemplary earpiece housing 5A and an exemplary dome 13A. The outer surface <NUM> of the earpiece housing 5A comprises a first protrusion <NUM>. The first protrusion <NUM> is aligned with the first vent groove <NUM> of the inner surface of the dome 13A along the longitudinal axis, such as along the earpiece axis X_E. The first vent groove <NUM> of the dome 13A receives the first protrusion <NUM> and thereby secures the dome 13A to the earpiece housing 5A in the longitudinal direction, such as along the earpiece axis X_E. The first protrusion <NUM> has a first height. The first height of the first protrusion <NUM> is less than the first depth of the first vent groove <NUM> in the dome 13A to ensure fluid communication via the first vent groove <NUM> in the dome 13A. In other words, by the first height of the first protrusion <NUM> being less than the first depth of the first vent groove <NUM> in the dome 13A a cavity is provided between the outer surface of the first protrusion <NUM> and an inner surface of the first vent groove <NUM> of the dome 13A through which a fluid can flow. The first protrusion <NUM> is circumferentially arranged along the outer surface <NUM> of the earpiece housing 5A. The first protrusion <NUM> may extend fully or partly along the circumference of the outer surface <NUM>. The first protrusion <NUM> extends perpendicular to the earpiece axis X_E. By providing the outer surface <NUM> of the earpiece housing 5A with the first protrusion <NUM>, the dome 13A is further secured to the earpiece housing 5A. The first protrusion <NUM> may comprise a plurality of first protrusion parts arranged along the circumference of the outer surface in the first position. In the example earpiece housing 5A shown in <FIG>, the first vent aperture(s) <NUM> of the earpiece housing 5A is formed in the first protrusion <NUM>. The outer surface <NUM> of the exemplary earpiece housing 5A comprises a second protrusion <NUM>. The second protrusion <NUM> is aligned with the second vent groove <NUM> of the inner surface of the dome 13A along the earpiece axis X_E. The second vent groove <NUM> of the dome 13A receives the second protrusion <NUM> and thereby secures the dome 13A to the earpiece housing 5A in the longitudinal direction, such as along the earpiece axis X_E. The second protrusion <NUM> has a second height. The second height of the second protrusion <NUM> is less than the second depth of the second vent groove <NUM> in the dome 13A to ensure fluid communication via the second vent groove <NUM> in the dome 13A. In other words, by the second height of the second protrusion <NUM> being less than the second depth of the second vent groove <NUM> in the dome 13A a cavity is provided between the outer surface of the second protrusion <NUM> and the inner surface of the second vent groove <NUM> of the dome 13A through which a fluid can flow. The second protrusion <NUM> is circumferentially arranged along the outer surface <NUM> of the earpiece housing 5A. The second protrusion <NUM> may extend fully or partly along the circumference of the outer surface <NUM>. The second protrusion <NUM> extends perpendicular to the earpiece axis X_E. By providing the outer surface <NUM> of the earpiece housing 5A with the second protrusion <NUM>, the dome 13A may be further secured to the earpiece housing 5A. The second protrusion <NUM> may comprise a plurality of second protrusion parts arranged along the circumference of the outer surface <NUM> in the second position. In the example earpiece housing 5A shown in <FIG>, the second vent aperture(s) <NUM> of the earpiece housing 5A is formed in the second protrusion <NUM>. The first primary vent aperture 16A and the first secondary vent aperture 23A in the exemplary dome 13A are arranged parallel to the dome axis X_D. The second primary vent aperture 16B and the second secondary vent aperture 23B in the exemplary dome 13A are arranged parallel to the dome axis X_D.

<FIG> shows an exemplary earpiece housing 5A. The exemplary earpiece housing 5A comprises the first protrusion <NUM> arranged on the outer surface <NUM> of the earpiece housing 5A and the second protrusion <NUM> arranged on the outer surface <NUM> of the earpiece housing 5A. The first protrusion <NUM> is arranged proximal to the second protrusion <NUM>. The first protrusion <NUM> is configured to be aligned with the first vent groove <NUM> of the inner surface of the dome 13A along the longitudinal axis, such as along the earpiece axis X_E, when the dome is mounted to the earpiece housing 5A. The first protrusion <NUM> has a first height. The first height of the first protrusion <NUM> is less than a first depth of the first vent groove <NUM> in the dome 13A to ensure fluid communication via the first vent groove <NUM> in the dome 13A, when the dome 13A is mounted on the earpiece housing 5A. The first protrusion <NUM> is circumferentially arranged along the outer surface <NUM> of the earpiece housing 5A. The first protrusion <NUM> may extend fully or partly along the circumference of the outer surface <NUM>. The first protrusion <NUM> extends perpendicular to the earpiece axis X_E. The second protrusion <NUM> is configured to be aligned with the second vent groove <NUM> of the inner surface of the dome 13A along the longitudinal axis, such as along the earpiece axis X_E, when the dome is mounted to the earpiece housing 5A. The second protrusion <NUM> has a second height. The second height of the second protrusion <NUM> is less than the second depth of the second vent groove <NUM> in the dome 13A to ensure fluid communication via the second vent groove <NUM> in the dome 13A. The second protrusion <NUM> is circumferentially arranged along the outer surface <NUM> of the earpiece housing 5A. The second protrusion <NUM> may extend fully or partly along the circumference of the outer surface <NUM>. The second protrusion <NUM> extends perpendicular to the earpiece axis X_E. A plurality of first vent apertures, such as a first primary vent aperture <NUM>, a first secondary vent aperture 9A, a first tertiary vent aperture 9B, a first quaternary vent aperture 9C, are formed in the first protrusion <NUM>. The first primary vent aperture <NUM>, the first secondary vent aperture 9A, the first tertiary vent aperture 9B and/or the first quaternary vent aperture 9C are arranged around the circumference of the first protrusion <NUM> and are configured to be in fluid communication with the first vent groove <NUM> of the dome <NUM>, 13A. A plurality of second vent apertures, such as the second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C, are formed in the first protrusion <NUM>. The second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C are arranged around the circumference of the second protrusion <NUM> and are configured to be in fluid communication with the second vent groove <NUM> of the dome <NUM>, 13A.

<FIG> shows an exemplary earpiece housing 5B. The exemplary earpiece housing 5B comprises the first protrusion <NUM> arranged on the outer surface <NUM> of the earpiece housing 5B. The first protrusion <NUM> is arranged on a proximal end of the earpiece housing 5B. The first protrusion <NUM> is configured to be aligned with the first vent groove <NUM> of the inner surface <NUM> of the dome <NUM>, 13A along the longitudinal axis, such as along the earpiece axis X_E, when the dome <NUM>, 13A is mounted to the earpiece housing 5B. The first protrusion <NUM> has a first height. The first height of the first protrusion <NUM> is less than a first depth of the first vent groove <NUM> in the dome <NUM>, 13A to ensure fluid communication via the first vent groove <NUM> in the dome <NUM>, 13A, when the dome <NUM>, 13A is mounted on the earpiece housing 5B. The first protrusion <NUM> is circumferentially arranged along the outer surface <NUM> of the earpiece housing 5B. The plurality of first vent apertures, such as the first primary vent aperture <NUM>, the first secondary vent aperture 9A, the first tertiary vent aperture 9B and/or the first quaternary vent aperture 9C, are formed in the first protrusion <NUM>. The plurality of second vent apertures, such as the second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C, are formed in the outer surface <NUM> of the earpiece housing 5B. The second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C are arranged on the outer surface <NUM> of the earpiece housing 5B, such as around the circumference of the outer surface <NUM> of the earpiece housing 5B. The second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C are configured to be aligned with the second vent groove <NUM> of the inner surface <NUM> of the dome <NUM>, 13A along the longitudinal axis, such as along the earpiece axis X_E, when the dome <NUM>, 13A is mounted to the earpiece housing 5B. The second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C are configured to be in fluid communication with the second vent groove <NUM> of the dome <NUM>, 13A.

<FIG> shows an exemplary earpiece housing 5C. The exemplary earpiece housing 5C comprises the second protrusion <NUM> arranged on the outer surface <NUM> of the earpiece housing 5C. The second protrusion <NUM> is arranged on a distal end of the earpiece housing 5C. The second protrusion <NUM> is configured to be aligned with the second vent groove <NUM> of the inner surface <NUM> of the dome <NUM>, 13A along the longitudinal axis, such as along the earpiece axis X_E, when the dome <NUM>, 13A is mounted to the earpiece housing 5C. The second protrusion <NUM> can thus be received by the second vent groove <NUM> of the dome <NUM>, 13A, when the dome <NUM>, 13A is mounted on the earpiece housing 5C. The second protrusion <NUM> has a second height. The second height of the second protrusion <NUM> is less than a second depth of the second vent groove <NUM> in the dome <NUM>, 13A to ensure fluid communication via the second vent groove <NUM> in the dome <NUM>, 13A, when the dome <NUM>, 13A is mounted to the earpiece housing 5C. The second protrusion <NUM> is circumferentially arranged along the outer surface <NUM> of the earpiece housing 5C. The plurality of second vent apertures, such as the second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C, are formed in the second protrusion <NUM>. The plurality of second vent apertures, such as the second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C, are formed in an outer surface of the protrusion <NUM>. The second primary vent aperture <NUM>, the second secondary vent aperture 10A, the second tertiary vent aperture 10B and/or the second quaternary vent aperture 10C are configured to be aligned with the second vent groove <NUM> of the inner surface <NUM> of the dome <NUM>, 13A along the longitudinal axis, such as along the earpiece axis X_E, when the dome <NUM>, 13A is mounted to the earpiece housing 5C. The plurality of first vent apertures, such as the first primary vent aperture <NUM>, the first secondary vent aperture 9A, the first tertiary vent aperture 9B and/or the first quaternary vent aperture 9C, are arranged on the outer surface <NUM> of the earpiece housing 5C. The first primary vent aperture <NUM>, the first secondary vent aperture 9A, the first tertiary vent aperture 9B and/or the first quaternary vent aperture 9C, are configured to be aligned with the second vent groove <NUM> of the inner surface <NUM> of the dome <NUM>, 13A along the longitudinal axis, such as along the earpiece axis X_E, when the dome <NUM>, 13A is mounted to the earpiece housing 5C. The first primary vent aperture <NUM>, the first secondary vent aperture 9A, the first tertiary vent aperture 9B, and/or the first quaternary vent aperture 9C are distributed around the circumference of the outer surface <NUM> of the earpiece housing 5C. The first primary vent aperture <NUM>, the first secondary vent aperture 9A, the first tertiary vent aperture 9B and/or the first quaternary vent aperture 9C are configured to be in fluid communication with the first vent groove <NUM> of the dome <NUM>, 13A.

<FIG> shows a part of an exemplary earpiece 3B. The earpiece 3B comprises an exemplary earpiece housing 5A and an exemplary dome 13B. The outer surface <NUM> of the earpiece housing 5A comprises a first protrusion <NUM>. The inner surface <NUM> of the dome <NUM> comprises a single vent groove, such as the first vent groove <NUM>, being in fluid communication with the first primary vent aperture 16A in the dome <NUM>. As can be seen in <FIG> the exemplary dome 13B does, in contrast to the exemplary dome 13A of <FIG>, not comprise a second vent groove in the distal end of the dome 13B. The first vent groove <NUM> is further in fluid communication with a first secondary vent aperture 23A. The first primary vent aperture 16A and/or the first secondary vent aperture is a through-going hole and/or a channel in the dome 13B, extending from the proximal surface <NUM> of the dome <NUM> to the inner surface <NUM> of the dome 13B. The first primary vent aperture 16A allows air to flow between the proximal surface <NUM> of the dome 13B to the inner surface <NUM> of the dome 13B. The first vent groove <NUM> is configured to be aligned with the first primary vent aperture <NUM> in the earpiece housing 5A along the longitudinal axis, such as along the earpiece axis X_E. The first vent groove <NUM> is circumferentially arranged along the inner surface <NUM> of the dome 13B. By providing the inner surface <NUM> of the dome 13B with the first vent groove <NUM>, a fluid connection between the first primary vent aperture <NUM> in the earpiece housing 5A and the first vent groove <NUM> of the dome 13B can be ensured when the dome 13B is correctly aligned with the earpiece housing along the earpiece axis X_E, without requiring an alignment of the dome 13B with the earpiece housing in an angular direction. Thereby, an alignment of the dome 13B to the earpiece housing is facilitated. The first vent groove <NUM> has a first depth. The first vent groove <NUM> may extend fully or partly along the circumference of the inner surface <NUM>. The first vent groove <NUM> extends perpendicular to the longitudinal axis, such as the dome axis X_D. The first protrusion <NUM> of the earpiece housing 5A is aligned with the first vent groove <NUM> of the inner surface of the dome 13A along the longitudinal axis, such as along the earpiece axis X_E. As can be seen in <FIG>, the first vent groove <NUM> of the dome 13A receives the first protrusion <NUM> and thereby secures the dome 13A to the earpiece housing 5A in the longitudinal direction, such as along the earpiece axis X_E. The first protrusion <NUM> has a first height.

The first height of the first protrusion <NUM> is less than the first depth of the first vent groove <NUM> in the dome 13A to ensure fluid communication via the first vent groove <NUM> in the dome 13A. In other words, by the first height of the first protrusion <NUM> being less than the first depth of the first vent groove <NUM> in the dome 13A a cavity is provided between the outer surface of the first protrusion <NUM> and an inner surface of the first vent groove <NUM> of the dome 13A through which a fluid can flow. The first protrusion <NUM> is circumferentially arranged along the outer surface <NUM> of the earpiece housing 5A. The first protrusion <NUM> may extend fully or partly along the circumference of the outer surface <NUM>. The first protrusion <NUM> extends perpendicular to the earpiece axis X_E. By providing the outer surface <NUM> of the earpiece housing 5A with the first protrusion <NUM>, the dome 13A is further secured to the earpiece housing 5A. The first protrusion <NUM> may comprise a plurality of first protrusion parts arranged along the circumference of the outer surface in the first position. In the example earpiece housing 5A shown in <FIG>, the first vent aperture(s) <NUM> of the earpiece housing 5A is formed in the first protrusion <NUM>. The example earpiece housing 5A comprises a second vent aperture <NUM> arranged distal to the first vent apertures <NUM>. In the example earpiece housing 5A shown in <FIG>, the second vent apertures <NUM> are arranged distal to the distal surface <NUM> of the dome 13B, when the dome 13B is arranged on the earpiece housing 5A. in the exemplary earpiece 3B shown in <FIG>, the distal surface <NUM> of the dome 13B is thus arranged proximal to the second vent aperture <NUM> of the earpiece hosing 5A along the earpiece axis X_E. The second vent apertures <NUM> are thus in fluid communication with an outer ear canal, such that air can flow between the earpiece housing 5A and the outer ear canal, through the second vent apertures <NUM> without passing through the dome 13B.

It may be appreciated that <FIG> comprise some modules or operations which are illustrated with a solid line and some modules or operations which are illustrated with a dashed line. The modules or operations which are comprised in a solid line are modules or operations which are comprised in the broadest example embodiment. The modules or operations which are comprised in a dashed line are example embodiments which may be comprised in, or a part of, or are further modules or operations which may be taken in addition to the modules or operations of the solid line example embodiments. It should be appreciated that these operations need not be performed in order presented. Furthermore, it should be appreciated that not all of the operations need to be performed. The exemplary operations may be performed in any order and in any combination.

Claim 1:
An earpiece (<NUM>, 3A, 3B) for a hearing device (<NUM>) for insertion into an ear canal of a user and having a longitudinal axis (X_E), the earpiece comprising:
an earpiece part (<NUM>, 4A) comprising an earpiece housing (<NUM>, 5A, 5B, 5C) having a distal end (<NUM>), a proximal end (<NUM>), and an outer surface (<NUM>) connecting the distal end to the proximal end, the earpiece housing comprising a first primary vent aperture (<NUM>) and a second primary vent aperture (<NUM>) in the outer surface, the earpiece part comprising a receiver (<NUM>) arranged within the earpiece housing; and
a dome (<NUM>, 13A) for securing the earpiece in the ear canal, wherein the dome has an inner surface (<NUM>) extending circumferentially along the outer surface (<NUM>) of the earpiece housing, the dome comprising a proximal surface (<NUM>) having a first primary vent aperture (16A), wherein the earpiece comprises a vent path (<NUM>) forming a fluid communication between the first primary vent aperture of the dome (16A) and the second primary vent aperture of the earpiece housing (<NUM>) via the first primary vent aperture (<NUM>) of the earpiece housing
wherein the proximal end (<NUM>) is the end closest to an ear drum (<NUM>) of the user when the earpiece is inserted into the ear of the user, and the distal end (<NUM>) is the end furthest away from an ear drum (<NUM>) of the user when the earpiece is inserted into the ear of the user;
wherein the first primary vent aperture (<NUM>) of the earpiece housing is arranged at a first distance from the proximal end (<NUM>) of the earpiece housing and the second vent aperture (<NUM>) of the earpiece housing is arranged at a second distance from the proximal end (<NUM>) of the earpiece housing, and wherein the second distance is larger than the first distance.