Patent Grant
11218819
This is a US national phase application under 35 USC § 371 of international application no. PCT/EP2019/052678, filed 4 Feb. 2019, which claims priority to German application no. 102018107195.7, filed 26 Mar. 2018 and German application no. 102018001016.4, filed 5 Feb. 2018. Each of the applications referred to in this paragraph are herein incorporated by reference in their entireties.
The invention relates to the field of hearing aids and earphones. More specifically, the invention relates to a universal adapter for earphones and hearing aids worn in the ear.
The present invention relates to an adapter which automatically adapts to the most diverse anatomical conditions of the human auditory canal, which can be used in most hearing aids on the hearing aid market, which can be worn on the ear, and which meets the individual audiological requirements with a very high level of wearing comfort.
Hearing aids are offered on the market by various manufacturers as BTE devices (devices to be worn behind the ear) and ITE (in-ear devices) in various designs and sizes. They essentially consist of microphone(s), amplifier, loudspeaker and power supply. In BTE devices, sound is introduced into the ear canal either via a flexible sound tube or via an external loudspeaker (“receiver in the canal”/RIC). At the ITE, all components are installed in a mostly individually fabricated hollow shell. ITEs are currently also available in standard housings. They are designed with a standardized sound outlet socket, which is inserted into a silicone dome, or into a made-to-measure earmold prepared for this socket.
In order to introduce the amplified sound of a hearing aid into the external auditory canal, in most cases a made-to-measure earmold/ear-piece made of cast acrylic (polymethyl methacrylate/PMMA) or light-curing material is made for the ear to be treated, because this provides a better fit for the respective individual anatomical shape of the ear canal of a hearing aid wearer, thereby providing a more secure hold of the earmold in the ear canal. To do this, an impression is made of the outer ear with a two-component silicone material (similar to a tooth impression). Nowadays, the shape of the negative is usually digitally captured using a 3-D scanner. The data is used to manufacture a blank by a third-party company using laser technology, then reworked by hand, so that its final finish is obtained. When sound is introduced by means of a sound tube, the tube is fixed by gluing it into the previously drilled made-to-measure earmold. Any ventilation bores that are required (diameter=0.6-0.8 mm) or bores that enable direct introduction of low-frequency sound events to the residual volume (volume between made-to-measure earmold and eardrum) (diameter=1.0 to 2.5 mm) are usually drilled parallel to the hole for the sound tube. A cerumen protection or a device that prevents the penetration of earwax into the sound outlet opening are extremely rarely integrated into a made-to-measure earmold when using sound introduction through sound tubes. In many hearing aids, the miniature loudspeakers are moved out of the housing of the hearing aid and connected to the hearing aid by means of a thin cable. For coupling to a made-to-measure earmold, external loudspeakers (“Receiver in the canal”; RIC) require special holding devices which have to be incorporated into the earmold, such as disclosed for example in publication DE 10 2006 004 033 A1.
A replacement of the made-to-measure earmold is necessary if the anatomical conditions in the ear canal change due to age or due to an increase or decrease in body weight.
Umbrella-shaped, mostly hemispherical, made of soft silicone, so-called “domes” are currently mostly used for trying hearing aids. The thin-walled hemisphere is, depending on the required sound transmission, provided with perforations and thus suitable for a high-frequency transmission, or closed for a broadband sound amplification. These domes are offered by the hearing aid providers for their own products. For the sound introduction via so called “small tubes” (relatively stiff thin tubes, outer diameter=1.5-2 mm, inner diameter=0.8-1.5 mm), the sound is transmitted from the behind-the-ear device (BTE) via thin tubes, which are provided with the corresponding dome, into the ear canal. With external loudspeakers (receiver in the canal; RIC), the domes are placed directly on the loudspeaker. The connection from the BTE device to the external loudspeaker is ensured by a thin cable (see e.g. publication EP 2 919 486 A1; US 760 905 S1; U.S. Pat. No. 7,681,577 B2). Some manufacturers offer domes for their own specific products (DE 10 2014 200 605 A1; EP 2 819 435 A1).
Hearing aid manufacturers offer product-specific silicone domes for the external loudspeakers they have developed. To anchor the external loudspeaker to the dome, a second component made of firmer material is injection molded into the dome. These domes generally have the same shapes and properties as thin tubes (e.g. documents DE 10 2014 200 605 A1; EP 1 995 991 A2; U.S. Pat. No. 8,290,187 B2; DE 10 2011 006 720 A1; U.S. Pat. No. 6,129,174 A1; US 2008/0 298 618 A1; WO 2001/069 971 A2; EP 2 819 435 A1).
Other, mostly older developments are intended for the use of in-ear devices, the standardized, proximal end of which is to be inserted into the auditory canal with the dome developed for this purpose (for example, documents EP 2 180 724 A1; US 2008/0 019 549 A1; US 368 309 S; EP 0 173 371 A1; U.S. Pat. No. 5,742,692 A1; WO 1993/025 053 A1; U.S. Pat. No. 5,748,743 A1; EP 0 040 259 A1; EP 1 521 498 A2; DE 199 08 854 C1; U.S. Pat. No. 8,693,719 B2; US 2011/0223 864 A1).
Silicone domes of consumer electronics (for earphones) are usually developed for the use of product-specific loudspeakers (“earphones”). Earphones in the entertainment industry generally have a larger sound outlet opening with a special socket that is used to connect the dome produced for this purpose. Relevant prior art can be found, for example, in documents US 2010/0 166 241 A1; U.S. Pat. No. 7,116,793 B2; DE 10 2013 203 784 A1; U.S. Pat. No. 8,189,846 B2; US 611 929 S1; US 2014/0 138 179 A1; U.S. RE38,351 E1; US 2009/0 154 749 A1; US 2013/0 163 803 A1; US 2015/049 897 A1; KR 10 2016 001 108 A1; U.S. Pat. No. 7,681,577.
Domes which are used in medical technology for stethoscopes or examination devices such as tympanometers or similar devices, are mainly designed to close the auditory canals of the examiner or the person being examined. They are usually applied externally to the auditory canal opening (see, for example, documents U.S. Pat. No. 7,664,282 B2; U.S. Pat. No. 4,055,233 A1; U.S. Pat. No. 6,473,513 B1). Manufacturers offer special domes for measurements by means of a probe to be inserted into the ear canal (see e.g. publication U.S. Pat. No. 6,253,871 B1).
The customer must be invited to at least two appointments to make a made-to-measure earmold. In about 30%-40% of all treatments with made-to-measure earmolds, customers complain about poor fit, the formation of moisture, an unpleasant sound, or even a feeling of pressure. Post-processing or even a new fabrication is required. Often more than two customer appointments are required.
Protection against the penetration of cerumen (ear wax) is most rarely incorporated into a made-to-measure earmold.
A problem that occurs in many cases is the so-called occlusion effect (closing effect). This means that the low-frequency parts of the own voice do not get/flow out, as with an open ear canal.
Frequencies reflected by the eardrum can, with the frequencies emitted by the sound exiting the made-to-measure earmold, lead to interference phenomena and thus to phenomena such as reverberation or “wobbling” of the sound. Since the position of the sound outlet in the ear canal, and thus the distance to the eardrum, is fixed due to the anatomical manufacture of the made-to-measure earmold, an improvement can be achieved only by a different position of the sound outlet due to changing the plasty, or by installation of a ventilation hole. However, depending on the diameter and length of the ventilation hole, there is a risk of acoustic feedback.
In addition to the already high costs for a made-to-measure earmold, these circumstances cause additional costs due to post-processing and new fabrications, which the company has to bear. More than 50% of customers find wearing a made-to-measure earmold rather uncomfortable. It usually has to be replaced after about 1.5-2 years of wear. This in turn creates high costs.
Many customers experience permanent tickling or even scratching when using domes and feel insecure because the same easily slip out of the ear canal. Domes are offered in different sizes (diameters), but usually with a fixed, unchangeable circumference within the manufacturing dimensions.
Silicone domes in the so-called “tulip” shape (see, for example, document EP 2 919 486 A1, FIG. 48; US 2005/0244026 A1) offer a variable diameter or circumference, but have, because of the very flexible wall thickness of approx. 0.3 mm, only little hold in the ear canal and itch or tickle the wearer. Chewing movements in particular irritate the ear canal skin. The tulip shape is mainly used to introduce broadband sound amplifications.
Since the proximal end, i.e. the end pointing towards the eardrum, usually has a flat end that is perpendicular to the sound outlet opening, occlusion effects and interference often occur, as described above.
One of the bigger problems arises from the fact that in almost all ear canals, directly behind the entry, there is a kink with an isthmus (constriction) located at this point. It is not uncommon for domes with a fixed circumference to get caught there when being pulled out and remain in the ear canal, which means that a visit to an ear, nose and throat specialist becomes necessary to have the dome removed.
One of the main disadvantages of commercially available silicone domes, however, is that no dome adapts exactly to the very individual anatomical conditions of the ear canal. Most silicone domes are circular at the dorsal end, i.e. towards the ear canal exit. However, there are no circular ear canals in nature. When choosing a dome with a larger diameter, the flexible material folds into the inside of the circumference at the dorsal end due to its thin walls of 0.3-5 mm. The resulting, more pointed, dorsal ends that rest against the wall of the auditory canal lead to the itching and scratching described above. Choosing a smaller silicone dome usually leads to tickling as well, since it is not fixed in the ear canal. Chewing movements intensify these effects, since the ear canal is moved during chewing movements by the jawbone underneath.
For protection against slipping out of the dome from the auditory canal, PVC support devices are known which are attached to thin tubes which are inserted in the large auricular cavity (cavum conchae). This support additionally leads to tickling, is not easy to use for older hearing aid users, and is therefore often rejected. Support devices for manufacturer-specific products are used for external loudspeakers.
Some silicone domes offer a certain variability, but are very complicated to handle and hard to use by the hearing aid wearer. Two-part products made of silicone are generally not suitable for older hearing aid users. With regard to hygiene and replacing the dome by themselves, these target groups are overwhelmed.
Adjustment of the opening for ventilation, up to the open sound introduction for the low sound component, is very difficult for the wearer.
Slightest changes in the opening cross-sections result in significant frequency changes when the amplified sound is fed (see e.g. document DE 10 2010 042 150 A1).
In order to solve the problem of anatomically adapting in a standard system a dome in an ear canal, products have also been developed that expand an air cushion by inflation, or that allow them to cling to the ear canal skin using metallic spring mechanisms. These domes can only be provided to a limited extent with openings that influence frequency. Due to the kink present in almost all auditory canals with the usual subsequent enlargement, the air in the system having an air cushion must be released, and pumped up again by the user when re-used (DE 43 39 899 A1). Metallic spring systems in a dome system can only act selectively, at the location of the greatest enlargement; whether due to temperature changes (described in US 2007/018 3613 A1) or by means of several ring-shaped suspensions. A resilient system makes positioning in the ear canal more difficult (see publication DE 43 39 899 A1). These domes also have a round shape, the problems described above when inserting and pulling out of the ear canal also occur here.
The properties and problems of the domes for external loudspeakers are almost identical to the properties of the domes for thin tubes described above.
Silicone domes, such as those used in consumer electronics or medical technology, are not suitable for the use of external earphones for hearing systems. These domes do not have a suitable connection option.
Thus, the invention is based on the object of providing an adapter for hearing aids and earphones which avoids the disadvantages of the prior art.
Accordingly, the adapter should reduce the effort involved in individually adapting hearing aids and earphones to the wearer. The fit in the ear canal should be improved and unpleasant sensations such as tickling or scratching should be avoided. The adapter should have a nonproblematic response to changes in the geometry of the ear canal. The adapter should be suitable both for in-the-ear devices, for behind-the-ear devices with receiver-in-the-canal, and for earphones from consumer electronics. A cerumen protection should be easy to integrate. The adapter should reduce the occurrence of an “occlusion effect”. He should also have a nonproblematic response to the presence of a constriction in the ear canal as well as the non-circular cross-sectional shape of the ear canal. The use of the adapter should be as simple as possible. The adapter has also the object of reducing the problem of the difficulty of correctly setting a ventilation opening.
By means of the present invention of this new type of adapter, the amplified sound of almost every hearing aid on the market can be guided immediately into the anatomically individually shaped human auditory canal due to its special shape and nature. By means of an intermediate adapter, ear loudspeakers of the entertainment industry can be coupled with the universal adapter.
The invention relates to a universal adapter having a flexible material, for introducing the amplified sound of a hearing aid or earphone into the individually shaped human auditory canal.
In the present case, “flexible material” means a plastic, in particular elastomers with a Shore hardness of 20-100 Shore A, which deforms sufficiently elastically under the pressure that typically occurs in use, and returns to its original shape after use. The universal adapter, or adapter for short, can also be combined with a non-flexible, essentially solid material as defined above, for example to create a solid core or a region intended for handling (e.g. handle).
The terms “hearing aid” and “earphones” are to interpreted broadly and include all the fields mentioned in the introduction, as well as all fields not mentioned in which elements which essentially have to be inserted into the auditory canal are required, i.e. not only when introducing sound, but for example also for noise protection.
According to the invention, the adapter has a plurality of trapezoidal hollow segments, or segments in short, consisting of said flexible material, which are arranged separate from one another, with their side walls that radially decrease from the dorsal (i.e. facing away from the body) to the proximal (i.e. facing towards the body) side, along a centrally arranged locking nipple that is made of (the same or another) flexible or of a solid material, and that serves to receive a sound outlet socket of the hearing aid. “Trapezoidal” refers to the cross-section viewed in the longitudinal direction (dorsal-proximal).
Further, the hollow segments are connected with the proximal, narrow ends of their contact surfaces to a proximal end of the locking nipple, the adapter having the form of a shortened ellipsoidal body, so that the same can be optimally adapted with its contact surfaces to the shape of the auditory canal by the restoring force of the elastic side walls.
An adapter designed according to the invention avoids the disadvantages known from the prior art. In particular, the adapter reduces the effort involved in individually adapting hearing aids and earphones to the wearer and can be produced as an inexpensive series product.
As will be explained in detail below, the fit in the ear canal is significantly improved, as the adapter automatically adapts to the given anatomical conditions of the ear canal when it is inserted, where it can be fixed without pressure due to its high flexibility. In conjunction with its flexible applicability, it can replace a large number of known silicone domes from various manufacturers and thus leads to a reduction of the time required for warehouse management and procurement in the shop of the hearing care professional, since he must stock only a very small range of different diameters of this silicone adapter.
Due to its shape and flexibility according to the invention, the risk of getting stuck when pulled out of the ear canal is very low. Unpleasant sensations such as tickling or scratching are largely avoided, even when chewing. The adapter reacts nonproblematically to changes in the geometry of the ear canal.
As explained below, it is suitable both for in-the-ear devices, for behind-the-ear devices with receiver-in-the-canal, and for earphones from consumer electronics.
A cerumen protection can also be easily integrated. The adapter also reduces the occurrence of an “occlusion effect”. He also reacts nonproblematic to the presence of a constriction in the ear canal, as well as the non-circular cross-sectional shape of the ear canal.
The use of the adapter is particularly simple, does not require any particular skill of the user, and can be done without prior knowledge.
The adapter can also be replaced in a simple manner and without the involvement of a specialist.
Finally, the adapter reduces the problem of difficulty in properly ad-justing a vent, as will also be shown.
Various embodiments of the invention will now be described in more detail below.
The number of trapezoidal hollow segments is preferably four. In other embodiments, it is two or three, or more than four, for example five or six.
According to one embodiment of the universal adapter, the contact surfaces of two adjacent segments run very close (for example 0 to 0.5 mm) from the proximal to the dorsal end of the adapter and parallel to one another, wherein the side wall of a segment has a first, narrow kink which is located on the outer edge and which is directed towards the inside the segment. The side wall adjoining this first kink therefore no longer runs exactly (in a sectional view) in the radial direction.
Optionally, the segment preferably has a radial elevation over the adjacent segment. The region of this elevation thus has a somewhat larger distance/radius from the centrally arranged longitudinal axis than in the case without the elevation.
A narrow kink also located on the outer edge of the neighboring “under-sliding” segment side pushes, upon an annular pressure, from the outside in the direction of a further kink of the receiving segment side, in the direction of which, starting from the first kink, it tilts.
The then one-over-another displaced kinks of the two segments form a closure of the contact surfaces which run parallel in a rest position (outside the auditory canal), so that, when all segments are configured according to this specification, when the adapter is inserted into the auditory canal, due to the small distances between the side walls at their proximal ends, at least a minimum ventilation of the residual volume between the adapter and the auditory canal, or with the outside with the eardrum, is ensured.
According to a further embodiment, in which all segments are shaped as described above (i.e. having kinks) and are arranged radially to the locking nipple, the segments have a distance from one another from the dorsal to the proximal end, said distance decreasing upon insertion into an auditory canal which has a slightly smaller cross section than the adapter. The curved kinks of the adjacent segments, which run parallel to one another in an elliptical arch section (viewed in the longitudinal axial direction), come closer, as a result of which continuous channels extending from the dorsal to the proximal end of the adapter can be formed by means of the curved side walls of the segments. The number of channels corresponds to the number of segments of the same type having the said distance from one another. In addition to the desired sound introduction through the locking nipple, these channels also allow low-frequency sound components to get into the ear canal in a natural or normal way.
According to a further embodiment, two segments form a channel by means of the mutually facing, and having a spacing, side walls configured as lastly described, while the side walls of the other segments shaped in accordance with the embodiment described further above form a closure, as a result of which only one channel is present, which means that only frequencies below about 800 Hz naturally reach the eardrum through this channel.
According to another embodiment, the adapter has two such channels and two closures due to correspondingly shaped segments. Thus, in the case of four segments, two accordingly identical segments are arranged rotated 180° adjacent to each other. According to this embodiment, two channels are available for the passage of sound, so that frequencies below approximately 1 kHz reach the eardrum through these two available channels in a natural way.
According to a further embodiment, the adapter has two segments which form a closure by means of two mutually facing side walls, while the described distance exists between the other side walls of the segments, as a result of which three channels are available, and frequencies below approximately 1.5-1.8 kHz reach the eardrum through these channels in a natural way.
The number of segments determines the possible number and the maximum size of the channels. Due to the number of segments and simple variation of the side walls, the number of channels can be varied, which results in a different transmission characteristic for the sound. The adapter thus reproducibly enables the acoustically desired, correct introduction of the amplified sound from the hearing aid into the auditory canal, and it fulfills the audiological conditions with regard to ventilation openings or openings of different sizes for the natural introduction of frequencies in the mid and low range.
According to one embodiment, the segments are arranged symmetrically around the longitudinal axis of the locking nipple in that, from a proximal point of view, at least the outer edges of the side walls of the segments run at least essentially in a straight line from the locking nipple to the contact surface. Optionally, the side walls also run in the region behind the outer edges in such a way that straight side walls are present, or they are shaped differently there, for example according to the above-described embodiment with a further kink.
According to a further embodiment, all segments are arranged spirally around the longitudinal axis of the locking nipple from the dorsal to the proximal end of the adapter. Accordingly, said outer edges each lie on a spiral path. The regions behind them can lie on the same path in view direction, or they can be “twisted” more, or less.
Any optionally existing channels can also follow said spiral shape.
According to another embodiment of the universal adapter, the centrally arranged locking nipple is formed as an element made of rigid plastic which serves to accommodate the sound outlet opening of external loudspeakers of commercially available hearing aids to be worn behind the ear.
According to another embodiment, the locking nipple comprises this element as a second component, which can either be used separately, or is present in a secure connection (two-component system).
According to one embodiment, which can be combined with all other embodiments, at the proximal end of the adapter an arc-shaped cerumen protection which is easy to clean covers the sound outlet opening. This is particularly preferably formed integrally with the rest of the adapter, but can also be designed to be interchangeable.
According to one embodiment of the adapter, at least two segments form an overlap when inserted into the auditory canal in the region of the outer edge and generate a closure by having two side walls which are displaced into the interior of the segment. The contact surfaces continue to keep the original size, i.e. the distance of the outer surface of the adapter from the longitudinal axis remains essentially the same.
Because of the overlap, the outer wall of a segment slides over that of the adjacent segment instead of forming an indentation, as is known from the prior art, which then naturally forms a region of a smaller distance from the longitudinal axis. Such a region then no longer rests against the wall of the auditory canal, which can lead to a deterioration in the holding properties and to an undesirable transmission of sound.
According to a further embodiment, for coupling ear speakers, in particular of entertainment electronics, the adapter comprises an anatomically shaped intermediate adapter. Said ear speakers mostly have proximally a dome-like shape. The intermediate adapter comprises a sound outlet socket made of solid material, which can be inserted into a receiving opening of the locking nipple and optionally has a kink. In this way, a releasable connection of the intermediate adapter with the rest of the adapter is provided. The intermediate adapter also includes a holding region with a clamping edge for the earphone. The sound transmission can thus be guided comfortably and without pressure into the ear canal by an ear speaker which can be clamped inside the preferably flexible clamping edge of the intermediate adapter. Thus, ear speakers of the entertainment industry can be used with the acoustically shaped intermediate adapter according to the invention with better acoustics and considerably improved wearing comfort.
Instead of the flexible clamping edge, hooks or the like can also be provided, which grip behind the earphone and thus fasten it to the dorsal end of the intermediate adapter. A magnetic holder is also possible if said end consists of or comprises a material which develops attractive forces when approaching the earphone magnet.
According to a further embodiment, the intermediate adapter consists of or comprises a two-component material. The sound outlet socket is preferably made of a solid plastic, and the clamping edge is made of a flexible plastic.
The invention is explained below by way of example using figures. It is shown in
The adapter (
The adapter has the shape of an ellipsoidal body cut off—transverse to the longitudinal direction running horizontally in the picture—to a little more than half of its length (see
From the proximal end (left in the picture) to approximately half the length of the ellipsoidal body, a tubular locking nipple 2 is arranged centrally in the longitudinal direction, see.
The proximal end of the locking nipple 2 forms the sound outlet opening for the amplified sound; in the present case it is covered with a semi-circular cover for protection against cerumen (ear wax) (cerumen protection 4,
Two or more, in the embodiment shown four, hollow “segments” 5 are arranged on the locking nipple 2 in the longitudinal direction around it (
The side walls 15 (
(
The segments 5 can have side walls 15 that extend radially outwards on a straight line. According to another embodiment, the segments 5 are arranged spirally around the longitudinal axis of the locking nipple 2 from the dorsal to the proximal end of the adapter (
The outer, broad sides of the trapezoidal segment 5 or the contact surfaces 1 are curved like a circular section 13 (
The ellipsoidal shape of the adapter is generated by the segments 5 which are arranged around the locking nipple 2 (see
The ends 13 of the contact surfaces 1 located dorsally are curved into the interior of the trapezoidal segments 5. The resulting reduction in the total cross section (reduced cross section 11,
The radial side walls 15 of the trapezoidal, hollow segments 5 connected from the dorsal to the proximal end with the locking nipple 2 can be curved on one or both sides into the interior of the segment 5 (curved radial side walls of the segments 15,
The segments 5 can be arranged at a distance 17 from one another also along the outer elliptical arc section (
For a hearing aid care that provides broadband amplification, i.e. of all frequencies contained in the speech spectrum, the adapter should allow ventilation of the remaining volume in front of the eardrum. For this purpose, and thus covering all ranges between an open hearing aid and one that is only to be provided with ventilation, one or more segments according to the invention can be designed in a simple manner in such a way that the corresponding audiological necessity is met. The differences can be seen from
According to the embodiment shown in
From the tight-fitting, narrow bend 9 present on the side facing the adjacent segment 5 (
The depression of the side surface 15 formed in this way offers space for the adjacent opposing segment 5, so that this—due to external pressure or when inserted into an auditory canal—with its narrow bend 18 running from the proximal to the dorsal end, can push itself under the segment 5 having the depression (
If the adapter is inserted into an auditory canal, the contact surfaces 1 are gently pressed radially outward against the auditory canal wall 19 by the restoring force of the side walls 15 of the segments 5 (
Depending on the arrangement of the different segments 5, the required adapter can close the ear canal (
The design of the adapter allows it to adapt itself automatically to the adequate shape of the human ear canal, whether oval, round or irregular, even with a strong isthmus (
Most sound output sockets of different hearing device designs can be inserted into the locking nipple 2, such as e.g. external loudspeaker 20
(
Likewise, the sound outlet socket 28 of the intermediate adapter shown in
By means of a locking nipple, which is present in the form of a molded or molded bushing 24 made of solid plastic such as polyamide or a material of similar strength,
While maintaining the dimension of the contact surfaces 1, by displacing the radially arranged side walls (offset side walls 26,
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|---|---|---|---|
| 10 2018 001 016.4 | Feb 2018 | DE | national |
| 10 2018 107 195.7 | Mar 2018 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2019/052678 | 2/4/2019 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/149947 | 8/8/2019 | WO | A |
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| 20210076145 A1 | Mar 2021 | US |
