Patent Description:
Within hearing diagnostics, it is of great importance to be able to perform efficient and accurate hearing test of infants as well as adults. When assessing the hearing loss of humans, a hearing diagnostic device, which is configured to be controlled to emit a sound signal and collect a response from the auditory system of the patient, is generally used. Different diagnostic devices, which are used for different hearing testing purposes, exist.

Diagnosing hearing impairment in the auditory system of infants or adults by use of e.g. Otoacoustic Emissions (OAE's), Auditory Evoked potentials (AEP), Acoustic Reflectivity (AR), Otoacoustic Reflectance (OR) or Tympanometry often requires inserting an acoustic probe into the ear canal of a patient. Typically, such acoustic probes consist of at least one transducer, and sometimes two transducers, configured for generating and emitting a stimulus signal to the auditory system of the patient. The auditory system of a human may respond to the stimuli signal by reflecting an emission signal, and during OAE measurements this emission signal is measured by a third transducer of the acoustic probe. The emission signals measured are easily affected by noise introduced into the signal, therefore an acoustic probe which accurately transmits and records the signal and which limits noise introduced into the measurements, is preferable.

Current hearing diagnostic devices continuously aim at optimizing the design in order to limit especially noise introduced into the measurements. Usually the acoustic probes are connected to a handheld device either directly by forming an integrated part of the handheld device or connected to the handheld device by a cable, which cable in one end is connected to the handheld device and in the other end is connected to the acoustic probe. However, several drawbacks exist for both types of devices, which therefore need further improvements to optimize the hearing diagnostic measurement setup.

A handheld device having the acoustic probe substantially integrated into the device has been extensively used and developed to optimize the accuracy of the diagnostic measurements. However, with a handheld device there still exist the risk of introducing errors into the measurement, since a handheld device is placed directly against the patient's ear, and any movement of the handheld device while the acoustic probe is inserted into the ear increases the risk of introducing noise. A similar risk of introducing noise is present in the cable attached acoustic probe solutions, where a movement of the cable to adjust the acoustic ear probe introduces noise and instability of the transducer, which is why a proper placement of the ear probe against the ear canal is needed in order to limit the risk of introducing noise.

Furthermore, when performing diagnostic hearing measurements, the risk of cross-contamination between two patients if the device is not sufficiently cleaned after use is increased when using a handheld device. That is, a large part of the handheld device comes into contact with the skin of a patient during measurement, and therefore needs substantive cleaning after a diagnostic hearing test has been performed. In a cable attached acoustic probe solution, such cross-contamination may be limited due to the cable creating a distance between the patient and the handheld part of the device. However, such cable solutions requires a secure coupling to the ear canal, since any movement of the cable during measurement may introduced unwanted noise.

The risk of erroneous measurements is further increased when debris is allowed to enter the acoustic tubes of the acoustic ear probe. Debris, which is allowed to enter and get trapped in the acoustic tubes may block the acoustic path which influences the calibration parameters of the probe and the subsequent diagnostic measurements.

In addition, during a diagnostic hearing measurement, especially when testing infants, the space available to operate a handheld device is limited. That is, when testing e.g. an infant, the infant usually lies in the arms of a parent or a crib, and the operator needs to operate the device in a limited amount of space, which may be difficult with a large handheld device, which should be arranged closely to the ear of the infant. Therefore, a repositioning of the handheld device and the ear probe may be necessary prior to the measurements, which increases the risk of disturbing the infant and introducing noise into the subsequent measurement. Furthermore, with a handheld device having an integrated ear probe, the operator should keep the handheld device in place, while the operator at the same time should angle the device such that the measurement screen is visible.

<CIT> discloses a hand held ear test probe for use in clinical evaluations of hearing problems. There are a number of important tests for evaluating hearing system losses which are based upon measurements taken in patients' external ear canals using a test probe. A probe is described for such tests which is inserted in the patient's ear and which is hand held by the clinician without the use of head bands or other probe supports. The hand held probe has a shaped outer casing which supports the probe and the related ear sealing and pressurizing means as well as the transducers for the transmitted and received audio test signals.

<CIT> discloses an improved ear probe and disposable ear tip system for insertion into an ear canal of a subject during auditory testing. The probe includes a base portion and a cap portion. The base portion of the probe houses electronic components for sound generation, transmission and collection. The cap portion of the probe includes features for mechanical attachment of the tip to the probe in such a way as to provide a tight acoustic seal between the probe and the tip. The tip is disposable and protects the probe from being occluded by debris in the ear canal.

<CIT> discloses a system and method for adaptively detecting a desired signal S(n) in a noisy environment. A main signal is obtained that has the desired signal and at least one of noise and interference from a collective noise source, an auxiliary signal is obtained comprising a version of the noise and/or a version of the interference from the collective noise source; and at a processing unit at least one signal feature is defined, noise and interference components corresponding to the noise and/or interference and the version of the noise and/or version of the interference are defined, and strengths thereof are estimated. The desired signal is estimated using the at least one signal feature and corresponding strengths, and the noise and/or interference components are estimated using the components and corresponding strengths.

<CIT> discloses a hearing testing probe apparatus. The hearing testing probe apparatus includes a probe tube detachably coupled at a first end to a probe body and extending through a center hole in an eartip to align proximate a face of the eartip at a second end. The probe tube includes a plurality of stimulus lumens for receiving and carrying stimulus from the first end of the probe tube for output at the second end of the probe tube. The probe tube includes one or more microphone lumens for receiving and carrying one or more measured responses from the second end of the probe tube to one or more microphones at the first end of the probe tube.

Thus, the drawbacks of a handheld devices having an integrated acoustic ear probe or a cable attached acoustic ear probe are many, and a need therefore exists to provide a solution, which limits at least some of these drawbacks to provide an improved diagnostic device that provides more accurate measurements and a more efficient diagnostic environment setup. Therefore, there is a need to provide a solution that addresses at least some of the above-mentioned problems. The present disclosure provides at least an alternative to the prior art solutions.

This and further objectives are met by an ear probe assembly comprising a housing structure having a proximal side and a distal side, wherein at least a first transducer and a second transducer are arranged in the housing structure. The first transducer comprising a first sound port and the second transducer comprising a second sound port. The ear probe assembly furthermore comprises at least one channel structure comprising at least a first transducer entrance and a second transducer entrance, configured to receive the first and second sound ports, respectively, wherein the channel structure protrudes from the proximal side of the housing structure. For guiding sound emitted by at least one of the transducers to the ear canal of a patient, the at least one channel structure forms an acoustic path between the first and second transducer and a tip portion of the ear probe assembly, where the tip portion is configured to connect with the channel structure. The tip portion furthermore comprises a set of integrated acoustic channels, which set of integrated acoustic channels are configured to connect with the channel structure in a detachable manner.

Accordingly, an ear probe, which comprises a detachable tip portion having a set of integrated acoustic channels, which are acoustically sealed and connected with the channel structure, is provided. This allows for an efficient ear probe of e.g. a diagnostic device, which limits noise and efficiently seals the acoustic path between the at least one or more transducers and the tip portion, thereby optimizing the acoustic signal emitted by the transducer and the further measurements by another transducer of a signal emitted by the auditory system of a patient.

In diagnostic devices used for hearing impairment testing, it is especially important to avoid cross-talk components introduced during the measurement, since the signals emitted by the.

auditory system as a response to a stimulus, are small and easily contaminated by cross-talk from the electronics of the measurement device. Thus, to reduce potential cross-talk in the acoustic probe of the diagnostic device, the ear probe assembly may in one embodiment be configured such that the first transducer comprises a first membrane and the second transducer comprises a second membrane, wherein the first and second transducers are arranged in the housing structure, such that the first membrane lies substantially perpendicular to the second membrane. Such an arrangement of the first and second transducer decreases the mechanical cross-talk in the ear probe assembly. That is, the signal produced by the second transducer (e.g. a receiver) may induce a signal (due to mechanical vibration of the receiver) in the first transducer, where the first transducer may be a measurement transducer (e.g. a microphone). Any cross-talk from the second transducer to the first transducer (i.e. a measurement transducer) may introduce an unwanted signal component in the hearing measurements performed by the hearing diagnostic device.

Furthermore, the perpendicular arrangement of the membrane of the first transducer and the membrane of the second transducer also provides and optimized space consumption within the housing structure of the ear probe assembly. With such construction, the first and second transducer can be arranged so that a limited amount of space is needed and a smaller housing structure is achieved.

Accordingly, in an embodiment of the ear probe assembly the housing structure may comprise a top end and a bottom end defining a longitudinal axis of the housing structure. Furthermore, the second transducer may comprise a top end facing the top end of the housing and a bottom end facing the bottom end of the housing. The first transducer may comprise a proximal side and a distal side facing the proximal side and the distal side of the housing structure, respectively, and defining a longitudinal axis of the sound port of the first transducer, where the longitudinal axis of the sound port is arranged substantially perpendicular to the longitudinal axis of the housing structure. Thus, the first and second transducer are arranged in relation to each other such that a bottom side of the first transducer faces the top end of the second transducer and a top side of the first transducer faces the top end of the housing structure. This allows for a better sound performance in the ear probe, where less cross-talk is introduced from e.g. mechanical vibrations between the first and second transducer. Furthermore, less space in the housing structure is needed to contain the first and second transducer, which in effect provides the possibility of a smaller housing structure of the ear probe assembly that is easier to handle for an operator handling the diagnostic device.

Furthermore, in an embodiment, a distal end of the first transducer is arranged to be substantially flush with a distal side of the second transducer. Having the first and second transducer substantially flush with each allows for a substantially flat surface area on at least a distal side of the housing structure, in a space optimized solution.

In a further embodiment, a circuitry board, such as a printed circuitry board (PCB), of the housing structure is arranged so as to cover the first transducer and the second transducer. This allows for a simple assembly process of the ear probe assembly, where the risk of overheating and damaging of the transducers during soldering of electrical components to the PCB is reduced. Furthermore, by attaching a PCB directly on the transducers the first and second transducer may be easily assembled prior to connection with the remaining components of the ear probe assembly.

Accordingly, in one embodiment, the first and second transducers are assembled together with the PCB and the channel structure. This combined structure is, after assembly, "clicked" into engagement with the housing structure, followed by a soldering of electrical components, such as wires to the PCB. Consequently, the components may be secured tightly in the housing by use of glue or other suitable means, such as a by mechanical fixation by adding attaching elements and/or structure to the PCB and the components, which are to be secured to the PCB.

In more detail, the circuitry board may in one embodiment, be arranged such that in a top end of the housing structure the circuitry board is connected to a distal end of the first transducer. From here, the circuitry board may extend along the longitudinal direction of the housing to a bottom end of the second transducer, where the circuitry in the bottom end is connected to the second transducer. This allows the circuitry board to follow the outer contours of the transducers, whereby space is optimized.

With the transducer arrangements in the housing structure of the ear probe assembly as described herein, a substantially longitudinal housing structure having a protruding channel structure is provided for. The substantially longitudinal housing structure allows for a better alignment of the tip portion to the ear canal of the user, since a small housing structure at least in the "width direction" defined by the direction between the proximal side of the housing structure and the distal side of the housing structure creates a small moment arm, which stabilizes the housing structure when the tip portion is inserted into the ear canal of a patient.

That is, in an embodiment, the housing structure may comprise a substantially flat surface area on the proximal side, wherein a distal side of the tip portion is configured to abut the substantially flat surface. Furthermore, the channel structure of said housing structure may extend into the acoustic channels of the tip portion, such that at least a part of the channel structure is substantially contained in the tip portion. This allows for an efficient seal between the tip portion and the channel structure, while also providing a substantially stable tip portion, which does not easily bend when the tip portion is arranged in the ear canal of a patient.

Furthermore, this also allows for a better ear probe placement in the ear in such a way that the operator does not need to stabilize the probe by holding the probe cable, which would cause noise to be induced into the measurements.

In more detail, in an embodiment, the ear probe assembly may be configured such that a distance between a proximal surface and a distal surface of the tip portion defines a length of the tip portion, wherein the channel structure is extending into the tip portion so as to take up at least half of the length of said tip portion. This allows for a substantially changing stability of the tip portion along the length thereof, such that the tip portion is more stable at the distal surface where the tip portion abuts the housing structure and less stable (i.e. more flexible) along the length of the tip portion towards the proximal side thereof.

When attaching a tip portion of the acoustic ear probe to the acoustic channels of the transducers, a correct alignment of the acoustic channels of the tip portion with the acoustic channels of the transducer should be achieved. This complexity of alignment between the tip portion and the channel structure of the ear probe assembly is alleviated with an ear probe assembly, which in one embodiment is configured such that the channel structure is formed with a substantially triangular circumference. The tip portion comprises a corresponding triangular opening configured to engage said triangular circumference of said channel structure in a detachable manner. This allows an attachment structure of the ear probe assembly, which can be attached in a one-way manner, in that the triangular shape allows for a perfect alignment between the acoustic channels of the tip portion and the acoustic path of the channel structure.

Furthermore, in an embodiment, the channel structure comprises at least two, preferably three independent and acoustically separated acoustic paths, which acoustic paths are each configured to connect with at least two, preferably three independent and acoustically separated acoustic channels of the tip portion.

According to the invention, the channel structure comprises at least three channels, wherein each channel comprises one of the transducer entrances, each configured to receive a corresponding acoustic channel of the tip portion in a proximal end thereof, and configured to receive the first and second sound ports of said first and second transducers in a distal end of said channel structure, wherein a filter is arranged in each of said three channels of said channel structure. This allows a sufficient damping of the impulse response of the ear probe.

In one embodiment, the filter may be a wax filter, which is configured to be exchangeable, inserted into each of the three channels of the channel structure. This allows for a disposable wax guard, which may easily be replaced by the user. Accordingly, not only does the tip portion reduce wax from entering the sound ports of the transducer, but also the wax guard of the channel structure provides an extra protection. Thus, if wax does penetrate into the channel structure, this may be stopped by the wax guard prior from entering the sound ports of the transducers.

The embodiments described herein, may furthermore comprise both an acoustic filter and a wax filter, where the wax filter ensures that debris is kept out of the acoustic channels of the channel structure to improve the acoustics of the probe, and where the acoustic filter improves the impulse response characteristics of the acoustic ear probe. The acoustic filters act as resistors to damp resonances in the frequency response of the transducers of the acoustic ear probe and thereby the length of the impulse responses. In certain measurements, such as e.g. Transiently evoked otoacoustic emissions (TEOAE), it is assumed that the impulse response of the acoustic ear probe has completely decayed after <NUM>-<NUM> in order to distinguish between speaker artefacts and an actual OAE response and if no filter is present, this would not be the case and the measurement would have a false response. Accordingly, the acoustic filters improve the accuracy of the acoustic probe measurements, by damping the resonances in the frequency response of the transducers.

In an embodiment, which is to be explained in further detail later, the channel structure may comprise a first and/or a second engagement structure, which is configured to engage with a part of said housing and/or the tip portion to provide an efficient seal and locking between the elements of the ear probe assembly.

It should be noted that, in an embodiment, the second transducer is preferably a receiver configured to emit a stimuli and the first transducer is a microphone configured to record an emitted signal from the auditory system being tested.

In accordance with embodiments described herein, the ear probe is configured to transmit an acoustic signal through one of the acoustic channels of the ear tip and to receive an acoustic signal through one of said acoustic channels and emitted by an auditory system of the person under test. Accordingly, as previously described, the acoustic channel of the channel structure and the ear tip are configured to as to be acoustically separated from each other.

Furthermore, in one embodiment, the bottom end of the housing structure is preferably connected to a cable, where the cable is another end is connected to a hearing testing system configured to control a hearing test setup. Accordingly, the diagnostic hearing testing system according to embodiments herein should preferably be understood so as to comprise a handheld device, from where a cable extends in order to optimize the hearing test measurements. By such a device, substantially constructed according to the embodiments described herein, a diagnostic device, which substantially overcomes the drawbacks of the prior art is provided for.

The individual features of each embodiment may each be combined with any or all features of the other aspects or embodiment.

Several aspects of the device and methods are described by various structures, functional units, modules, components, circuits, steps etc. (collectively referred to as "elements"). Depending upon the particular application, design constraints or other reasons, these elements may be implemented using electronic hardware, computer program, or any combination thereof.

A diagnostic device used for testing hearing impairment generally includes a handheld device and or a stationary device, to which an acoustic probe (i.e. an ear probe) is connected through e.g. a cable or integrated into e.g. the handheld device. The stationary device or handheld device comprises electronics configured to generate a stimuli signal to the acoustic ear probe, such that a stimuli signal may be transmitted into the ear canal of a patient by use of the transducers of the acoustic ear probe. Furthermore, the handheld or stationary device may comprise a processing unit configured to process a received signal, measured from the auditory system of a patient, by a second transducer of the acoustic ear probe. The processing unit may be configured to process the signal to obtain a hearing impairment characteristic of the patient being examined. Furthermore, the handheld or stationary device may comprise a display, from where an operator of the device may activate the device to send out a stimuli signal, analyze the signal measured by a measurement transducer of the acoustic ear probe etc..

It should be noted that throughout the disclosure, the wording "proximal" should be understood as defining a side of an element (e.g. tip portion, housing structure, transducers etc.) facing the opening of the ear canal of a patient, when the ear probe assembly is operated in the measurement position. Accordingly, the wording "distal" should be understood as a side opposite to the proximal side of and facing away from the opening into the ear canal of a patient.

Referring initially to <FIG>, a general overview of an ear probe assembly according to the disclosure is illustrated. The ear probe assembly <NUM> comprises a housing structure <NUM> having a proximal side <NUM> and a distal side <NUM>. The housing structure <NUM> is configured to contain at least a first transducer and a second transducer, where the first transducer comprises a first sound port and the second transducer comprising a second sound port (not shown). Furthermore, the ear probe assembly <NUM> comprises a tip portion <NUM>, which further comprises a set of integrated acoustic channels <NUM>. The tip portion <NUM> is configured to engage with a channel structure (not shown) of the ear probe assembly <NUM> in a detachable manner. The tip portion <NUM> is configured to engagement with the channel structure, such that a side portion <NUM> (i.e. the distal side) of the tip portion abuts a part of the proximal side <NUM> of the housing structure.

The housing structure is furthermore in a bottom end <NUM> connected to a cable <NUM>, which in the opposite end connects to e.g. a handheld device configured to be operated to control a measurement of the hearing impairment measurement setup in accordance with the definitions provided herein. It should be noted that even though not illustrated in more detail, the probe tip is configured such that the probe tip <NUM> substantially contains the channel structure, such that a sufficient acoustic seal is obtained. Furthermore, the detachable probe tip <NUM> makes it easy to change from patient to patient upon performing hearing measurements, whereby cross-contamination and clogged ear tips are avoided.

Accordingly, the ear probe assembly according to the disclosure is configured to transmit an acoustic signal through one of the acoustic channels of the ear tip <NUM> and to receive an acoustic signal emitted by an auditory system of a patient through one of the acoustic channels.

In the following figures, embodiments of the ear probe assembly will be described in more detail. It should be noted that substantially same elements will be provided with the same numbering.

Referring now to <FIG>, a partly exploded view of the ear probe assembly <NUM> according to <FIG>, where the tip portion <NUM> has been detached from a part of the housing structure <NUM>, is illustrated. In more detail, <FIG> illustrates a channel structure <NUM>, which forms part of the housing structure <NUM>. That is, in the embodiment shown, at least one channel structure <NUM> is configured to protrude from the proximal side <NUM> of the housing structure <NUM>. The channel structure <NUM> comprises at least a first transducer entrance and a second transducer entrance, configured to receive a first and second sound port of the first and second transducer in the housing structure, explained in further details in the following. The at least one channel structure <NUM> forms an acoustic path <NUM> from the first and second transducer to the tip portion <NUM>. The ear probe is configured to connect with the channel structure <NUM>, such that the set of integrated acoustic channels <NUM> connects with the channel structure <NUM>.

As may be best seen in at least <FIG>, the housing structure <NUM> comprises a substantially flat surface area on the proximal side <NUM>, wherein a distal side <NUM> of the tip portion <NUM> is configured to abut the substantially flat surface forming the proximal side <NUM> of the housing structure.

As seen in <FIG>, the channel structure <NUM> may comprise at least three channels <NUM>, <NUM>, <NUM>, wherein each channel <NUM>, <NUM>, <NUM> is configured to receive a sound port of either the first transducer or the second transducer in the distal end thereof, and in the opposite proximal end configured to connect with a corresponding acoustic channel <NUM> of the tip portion <NUM>. Accordingly, the channels <NUM>, <NUM>, <NUM> are configured to be contained in the integrated acoustic channels <NUM> of the tip portion, whereby a sealed acoustic path between the transducers of the housing structure and the ear canal of a patient is established.

Furthermore, as seen on <FIG>, the channel <NUM> structure further comprises an engagement structure <NUM> (also denoted a second engagement structure), which is configured to engage with the tip portion <NUM>.

With the construction ear probe assembly having the channel structure <NUM> and tip portion <NUM> as described herein, not only an efficient acoustic seal is achieved but also a sufficiently stable ear probe assembly. That is, the channel structure being substantially contained in the tip portion allows a proper alignment with the ear, since the "moment arm" of the probe tip in relation to the housing structure is minimized (to be explained in further detail). Accordingly, the risk of an unintentional bending by e.g. up and/or down movement of the ear probe causing noise, when the probe is inserted into the ear is decreased.

The ear probe according to embodiments of the disclosure is illustrated in more detail in <FIG>, which shows an exploded view of the ear probe assembly <NUM>. As seen in <FIG>, the ear probe assembly comprises at least a first transducer <NUM> and a second transducer <NUM>, which are arranged in the housing structure <NUM>. Preferably, a third transducer <NUM> is also arranged in connection with the first <NUM> and second transducers <NUM>. The arrangement of the transducers <NUM>, <NUM>, <NUM> is best illustrated in <FIG> and <FIG> and will be explained in further detail in relation to these figures.

<FIG> furthermore illustrates the channel structure <NUM>, which comprises at least two, preferably three independent and acoustically separated channels <NUM>, <NUM>, <NUM>, defining an acoustic path on the interior sides thereof. The acoustic paths are each configured to connect with the at least two, preferably three independent and acoustically separated acoustic channels <NUM> of the tip portion. The acoustic channels <NUM> of the tip portion <NUM> is in <FIG> illustrated with the acoustic channels <NUM> opening into a proximal side of the tip portion <NUM>. At the distal side of the ear tip <NUM>, the acoustic channels forms openings configured to receive the acoustic separated channels <NUM>, <NUM>, <NUM> of the channels structure <NUM>.

Furthermore, <FIG> illustrate the channel structure <NUM> according to embodiments of the disclosure in more detail. As is seen, the channel structure <NUM> comprises a first engagement structure <NUM> configured to engage with a part of the housing structure <NUM> on an inner side <NUM> of the housing structure to lock the channel structure <NUM> in said housing structure <NUM>.

In more detail, and best illustrated in further details in <FIG>, the first engagement structure <NUM> of the channel structure <NUM> comprise a step-wise flange structure protruding from a base portion <NUM> of the channel structure <NUM>. In other words the base portion <NUM> of the channel structure <NUM> forms a substantially triangular base (see e.g. <FIG>) of the channel structure <NUM>. From the distal side, a protrusion is formed, which form a first step <NUM> having a first diameter and which continues into a second step <NUM> with a second larger diameter than the first step. As best seen in <FIG>, the transition between the first step <NUM> and the second step <NUM> of the plate shaped flange protrusion forming the first engagement member <NUM> is configured to be recessed in the housing structure <NUM>, such that the second step <NUM> abut a protrusion <NUM> in the housing structure <NUM>, whereby the first engagement member <NUM> is retained inside the housing structure upon assembly thereof.

Accordingly, the channel structure <NUM> may as illustrated be formed with a substantially triangular circumference, wherein the tip portion <NUM> comprises a corresponding triangular opening configured to engage the triangular circumference of the channel structure <NUM> in a detachable manner. In this way, a "one-fit" attachment is achieved. That is, the substantially triangular shaping of the channel structure <NUM> and the tip portion <NUM> allows an easy alignment of the acoustic channels <NUM> of the tip portion and the channels <NUM>, <NUM>, <NUM> of the channel structure <NUM>.

In a further embodiment, also illustrated in <FIG>, the channel structure <NUM> comprises a second engagement structure <NUM>, which second engagement structure is configured to engage with the tip portion <NUM>. Accordingly and with reference to e.g. <FIG>, the second engagement structure <NUM> is formed as a protruding flange extending as a circular protrusion from said channel structure <NUM>. The second engagement structure <NUM> is configured to engage with a groove <NUM> of the tip portion <NUM>. Furthermore, a space between the second engagement structure <NUM> and the first step <NUM> of the first engagement structure <NUM> is configured to receive a protrusion <NUM> of the tip portion. Accordingly, the first and second engagement structures of the ear probe assembly ensures that the channel structure is tightly connected to the housing structure and furthermore that the ear tip is tightly connected to the ear tip.

Returning now to <FIG>, the transducer assembly will be explained in more detail. As previously mentioned, the ear probe assembly <NUM> comprises at least two transducers <NUM>, <NUM> where the first transducer <NUM> comprises a first membrane (not shown) and the second transducer <NUM> comprises a second membrane (not shown). In order to reduce cross-talk between the transducers <NUM>, <NUM>, the first <NUM> and second <NUM> transducers are arranged in the housing structure <NUM>, such that the first membrane of the first transducer <NUM> lies substantially perpendicular to the second membrane of the second transducer <NUM>. That is, the first membrane of the first transducer <NUM> substantially follows the longitudinal axis <NUM> of the first transducer defined by the longitudinal axis of the first sound port <NUM> of the first transducer <NUM>, whereas the second membrane of the second transducer <NUM> substantially follows a longitudinal axis <NUM> of the housing structure <NUM>. In this way, the first and second membrane are arranged perpendicularly to each, which at least reduces the mechanical cross-talk between the transducers.

In more detail in an embodiment, the housing structure comprises a top end <NUM> and a bottom end <NUM> defining said longitudinal axis <NUM> of the housing structure. The second transducer <NUM> comprises a top end <NUM> facing the top end <NUM> of the housing structure <NUM> and a bottom end <NUM> facing the bottom end <NUM> of the housing structure <NUM>. Furthermore, the first transducer <NUM> comprises a proximal side <NUM> and a distal side <NUM> facing the proximal side <NUM> and the distal side <NUM> of the housing structure <NUM>, respectively. The proximal side <NUM> and the distal side <NUM> of the first transducer defines said longitudinal axis <NUM> of the first sound port <NUM> of the first transducer <NUM>. Thus, the longitudinal axis <NUM> of said first sound port <NUM> is substantially perpendicular to the longitudinal axis <NUM> of the housing structure. Furthermore, the transducers <NUM>, <NUM> are arranged such that a bottom side of the first transducer faces the top end of the second transducer and a top side of the first transducer faces the top end of the housing structure.

With the arrangement of the transducer as described herein, not only is cross-talk between the transducer is minimized, but also a space optimization is achieved. That is, when arranging the transducer as previously described a substantially flat transducer arrangement may be obtained. That is, a smaller width of the housing is achieved, allowing for a more stable ear probe assembly which is more easily aligned with the ear of a patient.

Accordingly, in a further development of this embodiment, a distal end of the first transducer is arranged to be substantially flush with a distal side of the second transducer. This creates a substantially flat surface area of the transducer assembly, whereby less space is needed for the transducers to be arranged in the ear probe housing structure <NUM>.

Accordingly, the width, indicated in <FIG> as the dotted line <NUM>, of the housing structure <NUM>, defined by the distance between the proximal side <NUM> and the distal side <NUM> of the housing structure <NUM> may be decreased due to this substantially "flat" transducer assembly.

As illustrated in e.g. <FIG>, the ear probe assembly is configured such that a distance between a proximal surface and a distal surface of the tip portion defines a length (illustrated by the dotted line <NUM>) of the tip portion <NUM>. As illustrated, the channel structure <NUM> is at least in one embodiment extending into the tip portion <NUM> so as to take up at least half of the length of the tip portion <NUM>. However, it should be noted that the channel structure may extend more or less into the tip portion <NUM>. By providing the channel structure <NUM> such that it substantially extends into the tip portion, a better probe placement is allowed for in the ear, since the moment arm of the tip portion is decreased. In this way the operator of the diagnostic device does not need to stabilize the ear probe by holding the probe cable, whereby noise is reduced.

In a further embodiment, best illustrated in <FIG>, the ear probe assembly comprises a circuitry board <NUM>, which is arranged in the housing structure <NUM> so as to substantially cover the first transducer <NUM> and the second transducer <NUM>.

In further details, in an embodiment, the circuitry board <NUM> is arranged in the housing structure <NUM>, such that in a top end <NUM> of the housing structure <NUM>, the circuitry board is connected to a distal end of the first transducer <NUM>. From here, the circuitry board <NUM> extends along the longitudinal direction of the housing structure <NUM> to a bottom end <NUM> of the second transducer <NUM>. In this bottom end <NUM> the circuitry board <NUM> is connected to the second transducer <NUM>.

Arranging the PCB in connection with the transducers as described, provides for a simplified assembly process, where the PCB is mounted to the transducers prior to insertion in to the housing structure. Furthermore, the risk of overheating and damaging the transducers during soldering is reduced.

In an embodiment best illustrated in e.g. <FIG>, the ear probe assembly <NUM> is as previously described configured to receive the first sound port <NUM> and second sound port <NUM> of the first <NUM> and second <NUM> transducers in a distal end of the channel structure. In the embodiment shown in <FIG>, a filter <NUM> is arranged in a channel <NUM> of the channel structure <NUM>. Even though not shown in more detail in this cross-sectional view of the ear probe assembly, according to the invention, each of the three channels <NUM>, <NUM>, <NUM> of the channel structure <NUM> has a filter <NUM> arranged therein. It should be noted that the ear probe assembly could be made without this filter. However, for example, the filter could be construed as a wax filter which prohibits wax from entering into the transducers of the ear probe assembly.

Furthermore, with e.g. reference <FIG>, the acoustic ear probe may comprise both an acoustic filter <NUM> and a wax filter <NUM>, where the wax filter ensures that debris is kept out of the acoustic channels of the channel structure to improve the acoustics of the probe, and where the acoustic filter improves the impulse response characteristics of the acoustic ear probe. The acoustic filters act as resistors to damp resonances in the frequency response of the transducers of the acoustic ear probe and thereby the length of the impulse responses. Accordingly, the acoustic filters improve the accuracy of the acoustic probe measurements, by damping the resonances in the frequency response of the transducers.

Referring now to <FIG>, the substantially combined structural advantages of the ear probe assembly according to embodiments described herein will be explained in view of a diagnostic setup. The ear probe assembly <NUM> is configured to be inserted into e.g. an adult or infant ear <NUM> of a patient and of which patient the functionality of the auditory system should be measured. The tip portion <NUM> of the ear probe assembly <NUM> is inserted into the ear canal <NUM> of the patient, and the housing structure <NUM> is substantially aligned with the outer contours <NUM> of the ear. Accordingly, the ear probe assembly <NUM> is constructed such that the housing structure <NUM> comprises a substantially flat surface area, which aligns with the outer contours of the ear, whereby a secure and stable alignment with the ear reducing the risk of introducing noise due to re-positioning of the ear probe is achieved.

This is substantially achieved by the ear probe assembly construction described herein, which provides a reduced moment arm <NUM> of the ear. That is, the length <NUM> (i.e. the moment arm) of the tip portion <NUM> which extends outside the ear canal, when the tip portion <NUM> is inserted into the ear canal <NUM> is minimized due to the arrangement of the channel structure <NUM> in the tip portion <NUM> as described herein. Furthermore, the tip portion is stable and not easily "bendable", which together with the construction of the housing limits the need for re-positioning and thereby limits the introduction of noise.

It should be noted that the first transducer of the ear probe assembly preferably is a microphone, and the second and third transducers preferably are configured as receiver. The microphone is intended for measuring an acoustic response of the auditory system, which response is triggered by an emitted signal introduced into the ear canal by use of the one or more receivers.

With reference to at least <FIG> and <FIG>, a method of assembly of the ear probe assembly according to embodiments of the disclosures will be explained. As described previously, the ear probe assembly at a top level comprises a tip portion <NUM> connected to a channel structure <NUM> protruding from a housing structure <NUM>. Upon assembly of the ear probe assembly a first step is to provide a housing structure having an opening, into which the channel structure <NUM> should be arranged. A second step includes providing the above mentioned channel structure <NUM>, and a set of transducers. In a first step of assembly, at least a first and a second transducer is connected with the channel structure. In a second step of assembly, a printed circuit board is attached to the transducers, such that a probe assembly comprises the channel structure <NUM>, the first and second transducers and a PCB is provided. Accordingly, in a third step of assembly, the channel structure <NUM>, with the PCB and transducer set attached thereto is arranged in a first shell part of the housing structure <NUM>. The first shell part comprises the opening, through which the channel structure <NUM> protrudes. Furthermore, the first shell part of the housing structure <NUM> also comprises the protrusion <NUM> (c. <FIG>), which is configured to retain the first engagement member <NUM> of the channel structure <NUM> in the housing. In a fourth step of assembly, the cable <NUM>, which in one end is configured to connect with the housing structure <NUM>, and in the other end to diagnostic handheld operative device, is connected to the housing structure and the electrical wires configured to control the transducers of the housing structure <NUM> is soldered on the back of the PCB. Consequently, in a final step, the interior of the housing structure is filled with a glue to secure the different components in the housing structure <NUM>, and a second shell structure (formed as a lid) is attached to the first shell structure of the housing <NUM>. Preferably, the second shell structure is snapped into engagement with the first shell structure.

With the method described herein, especially with the subassembly of the PCB and transducers improves the assembly process and decreases assembly cost, since the transducers together with the PCB and the channel structure in this way are easily and accurately arranged in the housing.

It will also be understood, that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element but one or more intervening elements may also be present, unless expressly stated otherwise.

Claim 1:
Ear probe assembly (<NUM>) comprising:
a housing structure (<NUM>) having a proximal side (<NUM>) and a distal side (<NUM>);
at least a first transducer (<NUM>) and a second transducer (<NUM>) arranged in said housing structure (<NUM>), said first transducer (<NUM>) comprising a first sound port (<NUM>) and said second transducer (<NUM>) comprising a second sound port (<NUM>), wherein the first transducer (<NUM>) is configured as a microphone and the second transducer (<NUM>) is configured as a receiver;
wherein at least one channel structure (<NUM>) comprises at least a first transducer entrance and a second transducer entrance configured to receive said first (<NUM>) and second sound ports (<NUM>), respectively, wherein said channel structure (<NUM>) protrudes from said proximal side (<NUM>) of said housing structure (<NUM>), and
wherein said at least one channel structure (<NUM>) forms an acoustic path between said first and second transducer and a tip portion (<NUM>) of said ear probe, said tip portion (<NUM>) being configured to connect with said channel structure (<NUM>), wherein
said tip portion (<NUM>) further comprises a set of integrated acoustic channels (<NUM>), wherein the set of integrated acoustic channels (<NUM>) are configured to connect with said channel structure (<NUM>) in a detachable manner, and wherein the first transducer (<NUM>) comprises a first membrane and the second transducer (<NUM>) comprises a second membrane, wherein the first (<NUM>) and second transducers (<NUM>) are arranged in the housing structure (<NUM>), such that the first membrane lies substantially perpendicular to the second membrane,
and wherein the channel structure (<NUM>) comprises at least three channels (<NUM>, <NUM>, <NUM>), wherein each channel (<NUM>, <NUM>, <NUM>) comprises one of said transducer entrances, each configured to connect with a corresponding acoustic channel of said tip portion in a proximal end thereof, and configured to receive said first (<NUM>) and second sound ports (<NUM>) of said first (<NUM>) and second (<NUM>) transducers in a distal end of said channel structure (<NUM>),
characterised in that
a filter (<NUM>) is arranged in each of said three channels (<NUM>, <NUM>, <NUM>) of said channel structure (<NUM>).