EP3249953A1 - Pièce rapportée standard pour un écouteur classique - Google Patents

Pièce rapportée standard pour un écouteur classique Download PDF

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Publication number
EP3249953A1
EP3249953A1 EP17165387.6A EP17165387A EP3249953A1 EP 3249953 A1 EP3249953 A1 EP 3249953A1 EP 17165387 A EP17165387 A EP 17165387A EP 3249953 A1 EP3249953 A1 EP 3249953A1
Authority
EP
European Patent Office
Prior art keywords
standard
head piece
ear
attachment
earpiece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17165387.6A
Other languages
German (de)
English (en)
Other versions
EP3249953B1 (fr
Inventor
Thomas NÄTHER
Mareike SCHULTEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sivantos Pte Ltd
Original Assignee
Sivantos Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sivantos Pte Ltd filed Critical Sivantos Pte Ltd
Publication of EP3249953A1 publication Critical patent/EP3249953A1/fr
Application granted granted Critical
Publication of EP3249953B1 publication Critical patent/EP3249953B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • H04R25/656—Non-customized, universal ear tips, i.e. ear tips which are not specifically adapted to the size or shape of the ear or ear canal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/658—Manufacture of housing parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/021—Behind the ear [BTE] hearing aids
    • H04R2225/0213—Constructional details of earhooks, e.g. shape, material
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/023—Completely in the canal [CIC] hearing aids
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/025—In the ear hearing aids [ITE] hearing aids
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/77—Design aspects, e.g. CAD, of hearing aid tips, moulds or housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/11—Aspects relating to vents, e.g. shape, orientation, acoustic properties in ear tips of hearing devices to prevent occlusion

Definitions

  • the invention relates to a standard attachment for a standard earpiece which can be introduced into an ear canal in an insertion direction. Furthermore, the invention relates to a standard earpiece with a corresponding standard attachment.
  • BTE hearing aids (behind-the-ear, or behind-the-ear or BTE) wear a housing with components such as a battery and the signal processing unit behind the ear.
  • a flexible sound tube also referred to as a tube, directs the receiver's acoustic output signals from the housing to the ear canal.
  • RIC (Receiver-In-Canal) hearing aids are BTE hearing aids with an electrical connection to a speaker worn in the ear.
  • ITE hearing aids in-the-ear, also IdO or in-the-ear
  • CIC hearing aids are similar to ITE hearing aids, but are worn fully in the ear canal.
  • instant-fit hearing systems can be used.
  • Such instant-fit hearing systems are designed to be as universally applicable as possible and include standard ear pieces which are small enough to be placed independently of the respective anatomy in the ear canal of the respective hearing aid wearer.
  • standard earpieces often do not have sufficient support in the auditory canal, since they are not adapted to the individual ear canal or the auditory canal of the hearing aid wearer. The ear pieces slip easily.
  • domes umbrellas made of a plastic material can be used. Due to their soft edges, the domes adapt closely to the auditory canal or the ear canal. An irritation of the affected skin with itching and redness may be the result. Also, domes tend to occlusion by the tight completion of the ear canal. Some hearing aid wearers reject the use of domes for these reasons. Furthermore, standard domes find their limit in large auditory canals, as here the stop in the ear canal is not guaranteed. In this case, double domes must be used.
  • Otoplastics are attachments, which are manufactured by an ear impression individually for the respective hearing aid wearer.
  • earmolds are not optimized for standard hearing aids or standard ear pieces and therefore do not achieve a good fit in the earmould Ear. For this reason, the individual impression via CAM (computer-aided manufacturing) systems must be subsequently elaborately processed and optimized.
  • CAM computer-aided manufacturing
  • the invention is based, as a first object, on a possibility of how, when using a standard ear piece, optimum hearing perception and a comfortable fit of the respective hearing device can be achieved.
  • a second object of the invention is to provide a corresponding standard ear piece with improved wearing properties and improved hearing comfort.
  • the first object of the invention is achieved according to the invention by a standard attachment for a standard earpiece which can be introduced into an ear canal in an insertion direction, wherein the standard attachment comprises an end-side head piece and an adjoining wing portion, the outer contour of the earpiece Headpiece is formed to a multi-point or multi-line support of the head piece on the wall of an ear canal.
  • the invention proceeds from the fact that there are currently problems with the adaptation to the ear canal in standardized ear pieces and the corresponding articles.
  • attention is paid either to the best possible fit of the ear piece and accepting occlusion effects accepted.
  • special attention is paid to avoiding occlusion effects; the seat and hold of the ear piece in the ear then play a minor role.
  • it is difficult with the currently popular essays such as domes or earmolds to ensure both optimal comfort and optimal hearing when using in particular a standard ear piece.
  • the invention addresses this problem now by a standard essay whose geometry is changed compared to articles of the prior art.
  • the presently specified standard attachment comprises an end-side head piece, and an adjoining wing portion, wherein the outer contour of the head piece is formed into a multi-point or multi-line support of the head piece on the wall of an ear canal.
  • a punctiform or linear support of the standard essay at individual positions along the outer periphery, in particular at three positions by type a "three-point support" (viewed in cross section) on the wall within the ear canal is a secure positioning of the standard earpiece at the same time minimal Contact between the ear canal and the standard attachment ensures.
  • the outer contour of the end-side head piece is designed so that the standard essay is supported only at a few places within the ear canal. The hearing aid wearer hardly feels the ear piece in the ear, the wearing comfort is high.
  • the standard essay is available in the same geometry preferably in different sizes for different auditory canal anatomy and combines the advantages of standard domes and earmolds, as it allows an immediate adaptation of the ear piece to the ear canal without ear impression.
  • the attachment is suitable for standardized ear pieces, such as in particular CIC hearing aids, RIC hearing aids or ear pieces of a BTE hearing aid.
  • the basic cross-sectional area of the head piece is advantageously circular or oval, wherein the formation of a head piece with an oval cross-sectional area is preferred.
  • an oval cross-sectional area of the seat of the standard essay and thus the standard earpiece is particularly well within the usually also oval ear canal. From a circular or oval cross-sectional area can be deviated in detail but also, so that irregular cross-sectional areas arise.
  • a number of grooves extending substantially parallel to the direction of insertion are arranged on the outer circumference of the head piece, with the or each groove on the outer circumference of the head piece extending at least as far as the wing portion.
  • the outer contour of the head piece is modified, the number of possible locations for supporting the standard ear piece or the standard attachment is reduced to the remaining between the grooves outer circumference of the head piece.
  • the header preferably comprises a plurality of grooves uniformly distributed along its outer periphery. In this way, the hold of the standard ear piece within the ear canal is further improved.
  • the standard essay can be used preferably for both a left ear and a right ear.
  • the plurality of grooves along the circumference of the head piece by spaced substantially parallel to the insertion direction webs spaced from each other.
  • the outer contour of the webs is thus formed to a multi-point or multi-line support of the head piece on the wall of an ear canal.
  • possible support points of the head piece on or within the ear canal are reduced to the outer contours of the webs.
  • Line pads against the ear canal result in each case approximately parallel to the insertion along the outer contours.
  • four grooves and four webs are arranged along the outer circumference of the head piece, resulting in a substantially X-shaped cross-sectional area of the head piece.
  • a substantially X-shaped design provides a small footprint while maintaining a secure fit in the ear.
  • each web preferably forms a partial section of a circular path.
  • the outer contour of each bridge is thus rounded.
  • the outer contours of the webs can either lie on a common circular path or else form a subsection of a separate circular path.
  • the outer contours of the webs each form part of a separate circular path.
  • the diameter of the or each circular path which forms the outer contour of a web is expediently smaller than the diameter of the head piece. This results in a favorable for maintenance in the ear canal inclination of the retaining surfaces on the outer contour of the webs.
  • the wing portion a number of him from outside to inside penetrating openings, each opening is associated with a groove, and wherein each groove opens into the respective associated opening.
  • the wing section is dimensioned such that it is circumferentially spaced from the standard earpiece in the attached state of the standard essay. Due to the circumferential spacing between the inner wall of the wing portion and the outer wall of the standard ear piece a free space is formed. Since this interior of the wing section ends open on the outward-facing side of the standard attachment-that is, at the entrance of the ear canal-it represents a ventilation volume which enables ventilation in particular via the aforementioned openings and thus pressure equalization. Unwanted occlusion effects or occlusion effects are avoided.
  • the cross-section of the standard attachment expands counter to the insertion direction.
  • the used in the state of the standard essay (together with the standard ear piece) of the Eustachian tube facing head of the standard essay thus has a smaller cross-section than the located at the entrance of the ear canal wing section. In particular, this widens the cross section of the wing section.
  • the standard attachment is expediently fastened to the standard earpiece via the head piece or attached thereto in the attached state.
  • the head piece is preferably formed with a mounting opening for a frictional connection with the standard ear piece.
  • the attachment opening is preferably formed on the insertion-side end face of the standard attachment. In the mounting hole, a fastener of the standard ear piece can be inserted to releasably fix both components together.
  • the second object of the invention is achieved by a standard ear piece with a standard attachment according to one of the above Configurations.
  • the non-positive connection is designed as a rotatable clip connection.
  • the standard attachment is attached to the standard earpiece.
  • the fastening element is preferably rotatably received in the attachment opening. Because of this rotatable embodiment of the clip connection, the standard earpiece together with the standard attachment is suitable both for use in the ear canal of the right ear and in the ear canal of the left ear.
  • any ear piece can be used, which is located in the inserted state within the ear canal of the hearing aid wearer.
  • the standard ear piece is designed as a standard CIC hearing aid (Completely-In-Channel).
  • the housing of the hearing aid ends in the outer part of the ear canal and is characterized by little or no visible from the outside.
  • the standard attachment is attached to the hearing aid as described above and meets the requirements for comfort, secure fit and ventilation of the ear alike.
  • Fig. 1 is a standard essay 1 for a in Fig. 3 shown.
  • the standard attachment 1 is for a standard earpiece insertable into an ear canal in an insertion direction (shown in FIG Fig. 3 as a CIC hearing aid 27).
  • the insertion direction 3 which in this case extends out of the plane of the paper, is in Fig. 2 located.
  • the standard attachment 1 comprises an end-side head piece 5 and an adjoining wing portion 7.
  • the outer contour 8 of the head piece 5 is in this case formed to a multi-point or multi-line support of the head piece 5 along the wall of an ear canal.
  • four grooves 3 extending essentially parallel to the insertion direction 3 are present on the outer circumference 9 of the head piece 5.
  • the grooves 11 are distributed uniformly along the outer circumference 9 and are spaced apart from one another by webs 13 which extend along the outer circumference 9 of the head piece 5 and also extend substantially parallel to the insertion direction 3.
  • the head piece 5 essentially has an X-shaped cross-sectional area 15.
  • the X-shaped design of the cross-sectional area 15 offers in the inserted state of the standard essay 1 (in combination with a standard ear piece) a comparatively small bearing surface at the same time secure hold in the ear canal.
  • the rounded outer contours 17 of the webs 13 are in each case approximately on a circular path 19.
  • the normally oval ear canal the bearing surfaces on the outer contours 17 of the webs 13 are arranged approximately 45 ° to the normal, so that a firm and secure fit can be achieved.
  • the wing section 7 of the standard attachment 1 has four openings 21 penetrating it from the outside to the inside.
  • Each of the four openings 21 is assigned to one of the four grooves 11, each groove 11 opening into its associated opening 21.
  • the standard essay 1 is designed for optimal adaptation within an ear canal and at the same time compatible with a standard earpiece. There are both different sized standard ear pieces, as well as standard essays 1 combined with each other, so that an immediate adaptation of the ear piece to an ear canal despite different anatomy without ear impression is possible.
  • a fastening opening 25 is formed on the insertion-side end face 23 of the head piece 5, in which a fastening element of a standard ear piece, such as a ball head, can engage.
  • the occlusion-reducing construction elements 11, 21 are in Fig. 2 to recognize. Both the openings 21 and the grooves 11 extend substantially parallel to the insertion direction 3, wherein the grooves 11 are introduced on the outer circumference 9 of the head piece 5 and the openings 21 penetrate the wing gate 7. In this way, the necessary ventilation of the ear can be ensured if a standard ear piece with such a standard attachment 1 is inserted into the ear.
  • Fig. 3 the standard essay 1 attached to a standard ear piece 27 designed as an instant fit CIC hearing aid is shown. Both components are, as already mentioned, attached to each other via a non-positive rotatable clip connection.
  • an (indicated) fastener 29 engages, such as a ball head, the standard ear piece 27 in the mounting hole 25 of the standard attachment 1 a.
  • the instant fit CIC hearing aid 27 can be used together with the standard attachment 1 in an ear canal. For this purpose, both components are inserted together in the insertion direction 3 in the ear canal.
  • the standard essay 1 comes with a secure hold only a few line or point positions along the webs 13 to support and thus gives the respective hearing aid wearer a comfortable fit, as this barely feels the standard earpiece 27.
  • the ventilation takes place. as described above, on the occlusion-reducing construction elements 11, 21 of the standard attachment 1.
  • wing section 7 is circumferentially spaced from the standard earpiece 27, so that between the standard earpiece 27 and the wing portion 7, an interior 31 is formed within the wing portion 7.
  • the interior 31 of the wing section 7 is formed on the outwardly directed side 33 of the standard essay 1 - ie at the entrance of the ear canal - open and represents a ventilation volume. In this way, in combination with the openings 21 and the grooves 11, the necessary ventilation and thus the pressure equalization ensured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Manufacturing & Machinery (AREA)
  • Headphones And Earphones (AREA)
  • Prostheses (AREA)
EP17165387.6A 2016-05-24 2017-04-06 Pièce rapportée standard pour un écouteur classique Active EP3249953B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016208939.0A DE102016208939A1 (de) 2016-05-24 2016-05-24 Standard-Aufsatz für ein Standard-Ohrstück

Publications (2)

Publication Number Publication Date
EP3249953A1 true EP3249953A1 (fr) 2017-11-29
EP3249953B1 EP3249953B1 (fr) 2019-09-18

Family

ID=58709717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17165387.6A Active EP3249953B1 (fr) 2016-05-24 2017-04-06 Pièce rapportée standard pour un écouteur classique

Country Status (5)

Country Link
US (1) US10334375B2 (fr)
EP (1) EP3249953B1 (fr)
CN (1) CN107426640A (fr)
DE (1) DE102016208939A1 (fr)
DK (1) DK3249953T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10652644B2 (en) * 2018-09-20 2020-05-12 Apple Inc. Ear tip designed to enable in-ear detect with pressure change in acoustic volume
US11570537B2 (en) * 2020-08-31 2023-01-31 Oticon A/S Dome for hearing aids
US11425515B1 (en) * 2021-03-16 2022-08-23 Iyo Inc. Ear-mount able listening device with baffled seal
US11877110B2 (en) * 2022-01-13 2024-01-16 Bose Corporation Flow relief features embedded in cosmetic surface of wearables

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5002151A (en) * 1986-12-05 1991-03-26 Minnesota Mining And Manufacturing Company Ear piece having disposable, compressible polymeric foam sleeve
US20020027996A1 (en) * 1999-05-05 2002-03-07 Leedom Marvin A. Disposable modular hearing aid
EP2107832A2 (fr) 2008-04-01 2009-10-07 Siemens Hearing Instruments, Inc. Procédé pour la construction adaptative d'un petit instrument d'aide auditive CIC
US8411890B2 (en) 2008-03-27 2013-04-02 Siemens Medical Instruments Pte. Ltd. Hearing aid
US20160066110A1 (en) * 2014-08-30 2016-03-03 iHear Medical, Inc. Trenched sealing retainer for canal hearing device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006094502A1 (fr) 2005-03-10 2006-09-14 Widex A/S Oreillette pour prothese auditive
DE102010022324A1 (de) * 2010-06-01 2011-12-01 Siemens Medical Instruments Pte. Ltd. Tief-Ohrkanal-Hörinstrument sowie Gehäuse und Ohrstück
CN202334890U (zh) * 2011-11-16 2012-07-11 欧仕达听力科技（厦门）有限公司 可通气的通用式耳道助听器
CN204993858U (zh) * 2015-04-22 2016-01-20 欧仕达听力科技（厦门）有限公司 触控式耳道式助听器
CN105050016A (zh) * 2015-08-14 2015-11-11 张洪飞 入耳式助听器控制系统

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5002151A (en) * 1986-12-05 1991-03-26 Minnesota Mining And Manufacturing Company Ear piece having disposable, compressible polymeric foam sleeve
US20020027996A1 (en) * 1999-05-05 2002-03-07 Leedom Marvin A. Disposable modular hearing aid
US8411890B2 (en) 2008-03-27 2013-04-02 Siemens Medical Instruments Pte. Ltd. Hearing aid
EP2107832A2 (fr) 2008-04-01 2009-10-07 Siemens Hearing Instruments, Inc. Procédé pour la construction adaptative d'un petit instrument d'aide auditive CIC
US20160066110A1 (en) * 2014-08-30 2016-03-03 iHear Medical, Inc. Trenched sealing retainer for canal hearing device

Also Published As

Publication number Publication date
CN107426640A (zh) 2017-12-01
EP3249953B1 (fr) 2019-09-18
DK3249953T3 (da) 2019-12-16
US10334375B2 (en) 2019-06-25
DE102016208939A1 (de) 2017-11-30
US20170347211A1 (en) 2017-11-30

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