EP2587841A1 - Membrane destinée à recouvrir une ouverture d'un appareil auditif - Google Patents

Membrane destinée à recouvrir une ouverture d'un appareil auditif Download PDF

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Publication number
EP2587841A1
EP2587841A1 EP20120188609 EP12188609A EP2587841A1 EP 2587841 A1 EP2587841 A1 EP 2587841A1 EP 20120188609 EP20120188609 EP 20120188609 EP 12188609 A EP12188609 A EP 12188609A EP 2587841 A1 EP2587841 A1 EP 2587841A1
Authority
EP
European Patent Office
Prior art keywords
membrane
opening
hearing aid
cover
fibers
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
EP20120188609
Other languages
German (de)
English (en)
Other versions
EP2587841B1 (fr
Inventor
Charles Paul James Neilson
Claus Rudolph
Joseph Saurer
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
Siemens Medical Instruments 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 Siemens Medical Instruments Pte Ltd filed Critical Siemens Medical Instruments Pte Ltd
Publication of EP2587841A1 publication Critical patent/EP2587841A1/fr
Application granted granted Critical
Publication of EP2587841B1 publication Critical patent/EP2587841B1/fr
Not-in-force 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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • H04R25/654—Ear wax retarders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/658—Manufacture of housing parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24008—Structurally defined web or sheet [e.g., overall dimension, etc.] including fastener for attaching to external surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]

Definitions

  • This invention relates to a membrane for covering an opening in a hearing aid, a cover of an opening in a hearing aid, and a method of manufacturing a membrane for covering an opening in a hearing aid.
  • Hearing aids typically have a multiplicity of openings that are prone to water penetration and contamination.
  • openings are a microphone opening, a receiver opening, an opening for a switch element or an opening for ventilating a battery.
  • hearing aids are known in which parts of the hearing aid are arranged behind the ear, in the ear or in the ear canal.
  • hearing aids are e.g. Sweat or - especially in the ear canal - cerumen, ie earwax exposed. If moisture penetrates into the hearing aid, this can lead to corrosion and thus to malfunctions and defects.
  • cerumen in particular the acoustic openings for the microphone and the handset - also called receiver - be blocked. In the hearing aid penetrating cerumen can also lead to defects.
  • the openings become smaller and can therefore be blocked by relatively small amounts of external contamination and cerumen.
  • the dirt and cerumen accumulate over the course of the use, so that the blocking of the openings is initially easily overlooked by the user.
  • Microporous membrane which is attached to protect against cerumen and moisture in front of a sound outlet opening of a hearing aid, wherein the membrane, for example made of polytetrafluoroethylene (PTFE). Screeched polytetrafluoroethylene, also called expanded PTFE (ePTFE), is known under the Gore-Tex® brand.
  • PTFE polytetrafluoroethylene
  • ePTFE expanded PTFE
  • electrostatic spinning electrospinning for short, it is possible to produce a membrane with a structure of non-interwoven micro- or nanofibers, which is water and dirt repellent.
  • the use of such a membrane to cover an opening in a hearing aid asks for protection against ingress of moisture and dirt into the hearing aid.
  • the membrane is made of a polylactic acid, also known as polyactides or PLA for the common English term “polyactic acid” produced.
  • a polymer as a starting material allows easy electrospinning.
  • the levorotatory L-form of polyactides also called PLLA, is used for the common English term “poly (L-lactide) acid”.
  • the fiber is made from a fluoropolymer which is hydrophobic and oleophobic and thus offers particularly good protection against water or cerumen.
  • a fluoropolymer examples include polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE), also known under the trademark Teflon®.
  • Fibers in the form of microfibers with a diameter of 1 ⁇ m and 3 ⁇ m can be easily manufactured, are sturdy and yet allow the production of a membrane that provides protection against water and dirt.
  • Nanofibers with a diameter between 200nm and 500nm are particularly suitable for a very dense structure with very small pores, which are particularly water and dirt repellent.
  • the membrane for covering an acoustic interface of the hearing aid e.g. a sound outlet opening on the listener or sound inlet opening on the microphone
  • the use of a very thin - and thus sound-permeable - membrane with a thickness of less than 50 microns is particularly advantageous.
  • the thicknesses increase, water impermeability increases. A good balance of the various requirements is possible in the range between 20 ⁇ m and 80 ⁇ m.
  • a membrane diameter between 2mm and 10mm is preferred.
  • a separate from the hearing aid cover with a membrane described above allows easy replacement of the membrane in the event of damage.
  • a cover for a hearing aid offers the possibility to equip a hearing aid model with different membranes or to change the type of cover.
  • the cover next to the membrane itself still has a holding frame which partially surrounds the membrane, and a fastening means for attaching the cover to the hearing aid.
  • a cover with a holding frame made of plastic, in which the membrane is cast, is particularly easy to produce.
  • a fastener with a click closure By a fastener with a click closure, a simple attachment of the cover to the hearing aid is possible despite the small size of a hearing aid.
  • a hearing aid with an embodiment of the aforementioned membrane is protected against ingress of water and protection in the hearing aid.
  • the method for producing the membrane is based on the known method for electrospinning, wherein the non-woven structure resulting from the electrospinning is shaped in adaptation to the opening of the hearing device. This shaping can e.g. done by punching or cutting.
  • the membrane can either be inserted into the holding frame of the cover which can be fastened to the hearing device or fastened directly to the opening of the hearing device.
  • FIG. 1 shows the principle of an arrangement for the electrospinning of fibers.
  • a syringe 1 is a molten or dissolved polymer 2, which is pushed out of the syringe 1 through the cannula 3.
  • the cannula 3 is aligned with a target plate 4. Both the cannula 3 and the target plate 4 are metallic.
  • a voltage source 5 a voltage between the cannula 3 and the target plate 4 is generated, wherein the voltage is typically between 5kV and 35kV.
  • the distance between the cannula 3 de target plate 4 may for example be 5cm to 30cm.
  • the polymer at the tip of the cannula 3 forms a so-called Taylor cone, from the tip of a thin, initially still liquid polymer thread 6 emerges.
  • the polymer thread 6 accelerates on the way to the target plate 4 and hardens increasingly, until it finally accumulates on the target plate 4 as a thin, stiffened fiber. Due to the stress gradient from the tip of the cannula 3 and the target plate 4, the polymer thread 6 accelerates its Movement and assumes an irregularly swirling shape during the solidification process.
  • the fibers can have a diameter between 50nm and 10 ⁇ m. Among other things, this depends on the distance between the cannula 3 and the target plate 4, the type of polymer, the form of the liquefaction of the polymer and the applied voltage. This method and the relationships between these production parameters and the resulting thread are basically known per se.
  • FIG. 2 shows another arrangement for electrospinning, which differs from the in FIG. 1 illustrated arrangement differs by the type of the target electrode.
  • a metallic target drum 7 is arranged, which rotates about its longitudinal axis and is displaceable in the longitudinal direction.
  • the fibers can be given a particular orientation in particular. It is also possible, after passing through the roll in one direction, to repeat the process of electrospinning on the same roll with a changed orientation of movement to superimpose fiber layers with different orientations into a total structure.
  • FIGS. 3 to 6 show in each case in a plan view and a cross section two examples of non-interwoven structures of fibers 8 as a result of electrospinning.
  • These fiber structures are designed to meet certain requirements for a membrane to cover an opening in a Hearing aid meet.
  • Such membranes should be water, grease and / or dirt repellent. In addition, they must be mechanically durable enough and easy to handle. To cover sound openings, the membrane must also be sound permeable.
  • Suitable polymers are PET, PLA, PLLA and fluoropolymers such as PTFE, ePTFE and PVDF.
  • the fibers 8 may have an average diameter between 400 nm and 2 ⁇ m and be arranged to a membrane thickness between 20 ⁇ m and 70 ⁇ m.
  • the density of the structure may be, for example, 10% or less, i. the polymer volume corresponds to 10% or less of the total volume of the membrane. With increasing density and increasing membrane thickness, the structure becomes increasingly impermeable to water, but at the same time less permeable to sound. This shows by way of example that the individual manufacturing and material parameters have to be weighed in terms of requirements and coordinated in the context. This is done in the context of the expert trade by a systematic, iterative adaptation process.
  • Figures 3 and 4 show in plan view and a cross section of a membrane with a structure of non-interwoven fibers 8 made of PLLA with an average diameter of 2 microns and a thickness of 70 .mu.m. Even thinner membranes of this type with a thickness of 20 microns are conceivable.
  • the membrane With a membrane thickness of 60 ⁇ m to 70 ⁇ m, the membrane withstands a water pressure of 20mbar for more than 12 hours without water penetrating the membrane. A reduction in the membrane thickness increased to 40 ⁇ m significantly increases your water permeability.
  • Figures 5 and 6 also show in plan view and in cross-section, respectively, an acoustically improved membrane having an average fiber diameter of 400 nm and an increased fiber density.
  • the fibers 8 are as in the in the Figures 3 and 4 illustrated embodiment of the polymer PLLA.
  • this membrane With a membrane thickness of 20 ⁇ m, this membrane withstands a pressure of about 10mbar for 60 seconds before water slowly permeates through the membrane.
  • the membrane can be produced by stacking fiber structures of different polymers and different fiber properties.
  • the individual fiber layers may also differ with regard to their fiber density, the respective thickness and the fiber structure.
  • a coarse layer strengthen the stability of the membrane and a thin and dense layer increase the waterproofness.
  • the membrane should be as thin as possible, e.g. less than 50 ⁇ m thick yet durable.
  • fluoropolymers can be used for grease and water repellent properties.
  • the membrane should be easily connected to the hearing aid.
  • FIG. 7 shows in a plan view a cover 9 for an opening in a hearing aid.
  • the cover 9 comprises a round membrane 10 and a holding frame 11 which encloses the membrane 10 in its full extent.
  • the membrane 10 has a diameter of 5mm in this embodiment.
  • To cover openings in a hearing aid typically membrane diameters between 2mm and 10mm are useful.
  • the holding frame 11 has a radial width of 1mm.
  • the membrane 10 is round in this embodiment. Alternative also elliptical, rectangular and any other shapes are conceivable.
  • the membrane 10 is made flat here, but may also be curved in one direction, spherically curved or bulged locally.
  • the shape of the membrane 10 may be determined by the enclosure in the support frame 11 or may already be predetermined by a shape of electrospinning, e.g. by a corresponding shape of the target electrode.
  • FIG. 8 shows a cross section of the cover 9 after FIG. 7 , In this view, it can be seen that the membrane 10 is cast radially into the holding frame 11.
  • the holding frame 11 comprises a fastening means in the form of a click fastener 12, whose operation in FIG. 9 is explained.
  • FIG. 9 shows schematically a listener housing 13, on which the cover 9 after the FIGS. 7 and 8 by means of the click fastener 12 is attached.
  • the click closure 12 has a radially inwardly directed formation, which engages positively in a corresponding counterpart in the receiver housing 13.
  • the molding rotates in this embodiment, the full extent of the support frame 11.
  • the formation may also have individual punctiform nubs.
  • the receiver housing 12 is designed for insertion into an auditory canal. Accordingly, the shape of the receiver housing 12 is anatomically adapted, which is not apparent from this schematic drawing.
  • a receiver 14 which is connected by means of an electric line 15 via a cable 16 leading out of the receiver housing 12 to the remaining part of the hearing device, which is e.g. is designed for an arrangement behind the auricle.
  • the receiver 14 Depending on an electrical signal via the electrical line 15, the receiver 14 generates an acoustic signal that emerges through the membrane 10 from the receiver housing 12.
  • the cover 9 is mounted in front of an opening of the receiver housing 12 so that the membrane 10 seals the opening against ingress of water and foreign particles, e.g. Cerumen and dust, closes.
  • the membrane 10 is acoustically transparent, so that the sound generated by the receiver 14 can emerge from the receiver housing 12.
  • FIG. 10 shows a grid-like arrangement of a plurality of membranes 10.
  • the membranes 10 are each connected via six radially arranged around the respective membranes 10 plastic webs 17 with a plastic mesh 18. This shape is suitable for transporting the membranes 10 in a simple manner and for incorporating them in an automatic further processing process.
  • the shape of the membranes 10 is determined after electrospinning by laser ablation or by simple blanking or punching. Then the individual membranes 10 are received in the grid-like arrangement and connected to the plastic webs 17. Arranged in this form, further details of the shape of the membranes 10 can be determined by further laser ablation.
  • FIG. 10 merely shows a section of the grid-like arrangement which widens in all directions by repeating the pattern shown.
  • a linear arrangement of the membranes 10 in a chain one behind the other also permits simple further processing.
  • FIG. 11 schematically shows a behind the ear portable hearing aid 19 with two microphones 20, a signal processing unit 21, a battery compartment 22, a control element 23 and a receiver 14.
  • the microphones 20 the battery compartment 22, the control element 23 and the handset 14 is in the housing the hearing aid 19 each provided an opening.
  • the membranes 10 are each made by electrospinning, wherein the production parameters are adapted to the respective requirements of the membrane 10.
  • an opening which serves to ventilate the battery, which is usually dependent on an air supply for operation.
  • the membrane 10 mounted in front of this opening must be particularly watertight.
  • the control element may be a switch element for selecting a hearing program or a volume control.
  • the associated opening in the housing of the hearing aid 19 must in this case with a mechanically stable and waterproof membrane 10th be covered. However, the membrane 10 does not have to be acoustically permeable.
  • FIG. 12 shows a method of manufacturing the membrane 10 to cover an opening of a hearing aid 19.
  • a non-interwoven structure is created by electrospinning fibers 8.
  • the process of electrospinning has already been linked to the FIGS. 1 and 2 described in more detail.
  • the production parameters are systematically adapted to the requirements for covering openings on a hearing aid 19.
  • the membrane 10 is shaped to conform to the opening. This shaping is done by laser ablation, cutting or punching.
  • a plurality of the membranes 10 are arranged in a regular grid, as shown in FIG FIG. 10 is shown.
  • the membrane 10 is attached to the hearing aid 19 to cover the opening. This is done, for example, in two sub-steps, so that the membrane 10 first - as in the context of FIGS. 7, 8 and 9 described - is poured into a holding frame 11 and then the resulting cover 9 by means of the click mechanism 12 is attached to the hearing aid 19.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP12188609.7A 2011-10-31 2012-10-16 Membrane destinée à recouvrir une ouverture d'un appareil auditif Not-in-force EP2587841B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110085511 DE102011085511A1 (de) 2011-10-31 2011-10-31 Membran zum Abdecken einer Öffnung in einem Hörgerät

Publications (2)

Publication Number Publication Date
EP2587841A1 true EP2587841A1 (fr) 2013-05-01
EP2587841B1 EP2587841B1 (fr) 2015-12-30

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EP12188609.7A Not-in-force EP2587841B1 (fr) 2011-10-31 2012-10-16 Membrane destinée à recouvrir une ouverture d'un appareil auditif

Country Status (5)

Country Link
US (1) US20130108097A1 (fr)
EP (1) EP2587841B1 (fr)
CN (1) CN103096227A (fr)
DE (1) DE102011085511A1 (fr)
DK (1) DK2587841T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3114858B1 (fr) 2014-03-06 2019-06-26 Sonova AG Dispositif d'étanchéité thermoformé

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KR102201032B1 (ko) * 2014-11-10 2021-01-11 주식회사 아모그린텍 방수 음향 장치
KR20160075170A (ko) * 2014-12-19 2016-06-29 주식회사 아모그린텍 방수 음향 장치
CN105812968A (zh) * 2014-12-30 2016-07-27 桃园创新科技学校财团法人桃园创新技术学院 具备抗菌防臭与优越音质功能的麦克风覆布制造方法
US10015602B2 (en) 2015-08-26 2018-07-03 Cochlear Limited Systems and methods for improving output signals from auditory prostheses
DK3325703T3 (da) 2016-08-02 2019-10-28 Fitesa Germany Gmbh System og fremgangsmåde til fremstilling af ikke-vævede polymælkesyrestoffer
US11441251B2 (en) 2016-08-16 2022-09-13 Fitesa Germany Gmbh Nonwoven fabrics comprising polylactic acid having improved strength and toughness

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3114858B1 (fr) 2014-03-06 2019-06-26 Sonova AG Dispositif d'étanchéité thermoformé

Also Published As

Publication number Publication date
EP2587841B1 (fr) 2015-12-30
DE102011085511A1 (de) 2013-05-02
US20130108097A1 (en) 2013-05-02
CN103096227A (zh) 2013-05-08
DK2587841T3 (da) 2016-04-04

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