EP0487601B1 - Dispositif d'aide a l'audition par conduction osseuse - Google Patents

Dispositif d'aide a l'audition par conduction osseuse Download PDF

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Publication number
EP0487601B1
EP0487601B1 EP90912875A EP90912875A EP0487601B1 EP 0487601 B1 EP0487601 B1 EP 0487601B1 EP 90912875 A EP90912875 A EP 90912875A EP 90912875 A EP90912875 A EP 90912875A EP 0487601 B1 EP0487601 B1 EP 0487601B1
Authority
EP
European Patent Office
Prior art keywords
vibrating element
hearing aid
aid device
tooth
forming
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.)
Expired - Lifetime
Application number
EP90912875A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0487601A1 (fr
Inventor
Robert Issalene
Jean-François Lantrua
Bernard Saoli
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.)
AUDIODENT CIVILE Ste
Original Assignee
AUDIODENT
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 AUDIODENT filed Critical AUDIODENT
Publication of EP0487601A1 publication Critical patent/EP0487601A1/fr
Application granted granted Critical
Publication of EP0487601B1 publication Critical patent/EP0487601B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/604—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers
    • H04R25/606—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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
    • H04R2460/13—Hearing devices using bone conduction transducers

Definitions

  • the present invention generally relates to a hearing aid device by bone conduction.
  • the most conventional air conduction hearing aid devices operate by amplifying the sound signal, in particular by means of a loudspeaker placed in the channel of the external ear.
  • Other hearing aid devices less widespread, called bone conduction aim to excite the cochlea, by vibrating the cranial box.
  • Such devices include an emitting part and a transducing receiving part comprising a vibrating element which is placed either against the skin, usually behind the ear, under a certain pressure, or even in contact with the bone in the mastoid region.
  • direct bone conduction devices require surgical intervention for their placement.
  • the use of such devices poses serious maintenance problems such as charging or replacement. of batteries, reaction of the bone subjected to vibrations, adjustment, replacement in the event of failure.
  • Document FR-A-1 113 759 discloses a hearing aid device according to the preamble of claim 1, the transmission of which between the transmitting part and the receiving part is carried out by acoustic waves.
  • Such a device is binding on the user insofar as according to this prior document the transmitting part must be held firmly against a bone of the human body, such as for example the hip.
  • the quality of the sound reaching the ear is relatively poor, due to parasitic filtering effects by the bone during transmission.
  • This device also has serious drawbacks which limit the possibilities of use, insofar as to be able to listen, the user must keep his mouth open, the microphone constituting the emitting part being disposed between the incisors. In addition, this microphone amplifies on the one hand, the user's own way, on the other hand, the noises of chewing, which is very uncomfortable.
  • the invention therefore aims to solve the new technical problem consisting in the supply of a hearing aid device by bone conduction which makes it possible to obtain a quality of reception of sounds comparable to that of known devices, but who does not suffer from the various drawbacks induced by a surgical procedure necessary for their final placement.
  • a hearing aid device of the type comprising an extra-oral emitting part and an intra-oral transducing receiving part comprising a vibrating element, said receiving part being adapted to be fixed in the mouth of its user, and comprising means for supporting and holding the vibrating element shaped to ensure in position of use the permanent contact of said vibrating element with at least one tooth, and / or with the palatine bone, thus ensuring transmission of the sounds to the inner ear, by bone conduction, characterized in that the transmission between the transmitting part and the receiving part is carried out by means of coupling by electromagnetic waves. , and in that said vibrating element is sealed and electrically isolated.
  • the aforementioned vibrating element comprises a thin metal plate coated on one of its faces, preferably with the exception of two lateral bands, of a piezoelectric ceramic, said plate thus coated being included in an envelope consisting of a film of biocompatible polymer, waterproof and electrically insulating, having an extra thickness at said side bands.
  • the vibrating element further comprises a portion forming a stud preferably made of the same material as the aforementioned envelope, arranged substantially in the center of said vibrating element and adapted to come into contact with a tooth in position d 'use.
  • the means for supporting and maintaining the vibrating element comprise at least one hook-forming element comprising lugs for hooking to said tooth and to the two adjacent teeth and connected to at least one slide-forming element shaped to receive said vibrating element and to ensure its maintenance against the vestibular face of the tooth.
  • these support and holding means consist of two hook-shaped elements arranged on either side of the tooth, each hook-shaped element being connected to a slide-forming element, said slide-forming elements being secured by a rigid rod.
  • the two elements forming a slide have a cross section substantially in the shape of a U and ensure, by their bottom portion of said U, the connection to the above-mentioned hook elements.
  • the means for supporting and holding the vibrating element consist of a palatal plate, optionally the palatal plate of a partial or total dental prosthesis, preferably made of an acrylic resin and comprising a housing shaped to receive said vibrating element and to ensure its maintenance against the palatal bone.
  • the receiving part further comprises a miniaturized assembly comprising a receiver, an amplifier and batteries preferably rechargeable by inductive coupling, these elements being joined together and to said vibrating element by means of flexible connectors.
  • the aforementioned receiver, amplifier and possibly the batteries are included in an envelope made of a polymer resin, shaped to adapt, in the case of contact with a tooth, with the vestibular space available.
  • a hearing aid device in accordance with the invention, consists of two separate parts, namely an extraoral emitting part and an intraoral transducing receiving part.
  • the transmitting part is constituted, in a manner known per se, by a microphone connected to the input of a correcting amplifier modulating a conventional wireless transmission system.
  • This part can be made in compact form and powered by batteries.
  • the receiving part is constituted by a miniaturized assembly comprising a receiver, an amplifier and a vibrating element, these different elements being advantageously joined together by flexible electrical conductors, thus allowing great adaptability to the anatomical particularities of the mouth of each person to set sail.
  • FIG. 1 shows a cross-sectional view of a vibrating element (vibrator or vibrator) of a hearing aid device according to the invention, in the case of contact with a tooth.
  • This vibrating element 2 is constituted by a metallic plate 10, substantially rectangular and of small thickness coated on one of its faces with a piezoelectric ceramic 13; said plate thus coated being included in an envelope 14 constituted by a film of biocompatible, waterproof and electrically insulating polymer, such as for example an acrylic resin film.
  • the vibrating element further comprises electrical connections, not shown, preferably embedded in the polymer film constituting the envelope.
  • the piezoelectric ceramic layer 13 will cover the entire surface of one of the faces of the metal plate 10, with the exception of two lateral bands 11, 12 in order to increase the amplitude gradient between the center of the plate 13 and its two lateral edges.
  • the polymer film constituting the envelope 14 has an extra thickness 15, 16 at the side strips 11, 12 for reasons which will be explained below.
  • the vibrating element 2 further comprises a portion 17 forming a stud, substantially frustoconical and preferably arranged in the center of the vibrating element 2 and intended to come into contact with the tooth, in the position of use.
  • This stud 17 is preferably made of the same material as the casing 14 and can be attached or made from one material.
  • FIG. 2 is a perspective view illustrating the means for supporting and maintaining the vibrating element shown in FIG. 1.
  • These means comprise two elements 21, 22 forming a hook, intended to be arranged, in the position of use, on either side of a tooth 4 (see FIG. 3); each element 21, 22 being connected to a slide element 26, said slide elements being secured by a rigid rod 25.
  • This rod may be placed, in the position of use, in the vicinity of the vestibular face of tooth 4, as in the example shown and makes it possible to avoid mechanical stresses (in particular torsion or bending) being exerted in a significant manner on the vibrating element.
  • the hook elements 21, 22 can be made of nickel-chrome and ensure the attachment of the vibrating element to the tooth. To this end, these elements include lugs for hooking 23 to tooth 4 and 24 to adjacent teeth.
  • These elements can be produced by taking an impression of the tooth 4 and the adjacent teeth, so as to ensure effective fixing.
  • the two elements forming a slide 26 disposed at each end of the rod 25 are intended to receive the lateral edges of the vibrating element 2 and to ensure that it is held against the vestibular face of the tooth 4.
  • the thicknesses 15, 16 of the envelope 14 of the vibrating element 2 are advantageously conformed to the internal dimensions of the elements forming slide 26 which have a cross section substantially in the shape of a U, to maintain the vibrating element in the slide, without risk of bending or pulling.
  • the slide elements 26 further ensure the connection of the hook elements 21, 22 to the rigid rod 25.
  • the hook elements 21, 22 are fixed, for example by welding to the bottom part 27 of the elements slide 26, while the rod 25 is fixed on the adjacent face 28 of this element.
  • the receiving part generally represented by the reference 1 in FIG. 4 further comprises a miniaturized assembly comprising a receiver, an amplifier and batteries.
  • the receiver, the amplifier and possibly the batteries are included in an envelope made of a polymer resin, such as for example an acrylic resin, of foam form, shaped to adapt to the available vestibular space 30.
  • the envelope 29 advantageously has a sealing strip 29a ensuring intimate contact, on the vestibular face of the tooth, near the free edge of the latter. This strip masking the vibrating element 2 prevents food stuffing in the space existing between the vibrating element and the tooth, during chewing.
  • FIG. 5 illustrates a second embodiment of the receiving part of a hearing aid device according to the invention, in the case of contact with the palatal bone.
  • Teeth can be all natural, or natural for some and artificial for others.
  • the teeth 37 are artificial, the three visible hooks bearing on natural teeth.
  • FIG. 6 is a sectional view of FIG. 5 at the level of artificial teeth, while FIG. 7 is an enlarged view of detail A of FIG. 6.
  • This second embodiment finds particular application in the case where the patient to be fitted has incomplete toothing (partial edation). It should be noted that, in this hypothesis, both conduction through the palatine bone and conduction through the teeth are used.
  • FIGS. 6 and 7 can also represent a sectional view of a complete prosthesis in the case of total edation.
  • the means for supporting and holding the vibrating element are formed by the palatal plate and the conduction is done only by the palatal bone.
  • contact with the palatal bone is understood to mean the intimate contact of the underside of the palatal plate (which may be the palatal plate of a total prosthesis) with the fibromuqueuse covering the bone palatine by means of the salivary film.
  • This film contributes to the conduction of vibrations and constitutes a conduction medium very much superior to air.
  • the vibrating element 2 has a general structure identical to that described above with reference to FIG. 1.
  • the means for supporting and holding the vibrating element are constituted by a palatal plate 31, preferably made of an acrylic resin and comprising a housing 32 shaped to receive the vibrating element 2 and ensuring its maintenance against the 'palatine bone.
  • the dimensions of the housing 32 are such that the portion forming a stud 17 exerts a pressure at the center of the wall 33 of small thickness, forming the bottom of the housing 32 in contact with the palatal bone.
  • the palatal plate 31 can be that of a partial or total dental prosthesis of the "assistant" type, that is to say mobile.
  • this is one of the original features of the invention which provides, in the case of partial or total toothlessness, a bifunctional device which fulfills both the role of dental prosthesis and the role of prosthesis hearing, each of the two functions does not interfere with the other.
  • a palatal plate is prepared which is adapted to the shape of the patient's palate to be fitted.
  • an open housing is provided, the dimensions of which are slightly greater than those of a vibrating element 2.
  • a vibrating element on the lateral edges of which are fixed hooks 34 is introduced into the housing 32 so that the vibrator comes into contact with the wall 33 forming the bottom of the housing.
  • the vibrating element is placed in its housing, it is covered by a film of plastic foam 35, then by a layer of acrylic resin 36 sealingly closing the housing 32.
  • the batteries, the amplifier and the receiver can be placed inside artificial teeth 37, in the case of partial edentulousness.
  • FIG. 8 The elements constituting the transmitting part (FIG. 8) and the receiving part (FIG. 9) of a hearing aid device according to the invention are shown diagrammatically, by way of example of embodiment.
  • the transmitting part comprises the following elements connected in series: a sensitive microphone 101, an amplifier 102, a "low pass” filter 103, a voltage controlled oscillator 104, a second amplifier 105, a transformer 106 and an induction loop 107 .
  • this transmitting part is as follows: The signal is picked up by the microphone 101, amplified by the amplifier 102 and then limited in its bandwidth by means of the filter 103 (filter 6 dB at 4.5 kHz; 70 dB min from 6.5 kHz to 50 kHz); a carrier substantially equal to the free frequency of the oscillator 104 is thus modulated by the output of the filter 103 which acts on the voltage control input of the oscillator 104 then the modulated signal is transmitted to the transformer 106, by the intermediate of the amplifier 105, to drive the induction loop 107.
  • the receiving part likewise includes the following elements: a coil 111, an amplifier 112, a demodulator (phase locked loop) 113, an amplifier 114 and the piezoelectric resonator 115.
  • this receiving part is as follows: The signal is detected by the coil 111, it is amplified by the amplifier 112, the demodulator with locking loop 113 detects the carrier at 24 kHz, locks and extracts the signal which is then amplified by the amplifier 114 to attack the piezoelectric resonator 115.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Neurosurgery (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Finger-Pressure Massage (AREA)
  • Prostheses (AREA)
EP90912875A 1989-08-17 1990-08-17 Dispositif d'aide a l'audition par conduction osseuse Expired - Lifetime EP0487601B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8910987A FR2650948A1 (fr) 1989-08-17 1989-08-17 Dispositif d'aide a l'audition par conduction osseuse
FR8910987 1989-08-17
PCT/FR1990/000614 WO1991002503A1 (fr) 1989-08-17 1990-08-17 Dispositif d'aide a l'audition par conduction osseuse

Publications (2)

Publication Number Publication Date
EP0487601A1 EP0487601A1 (fr) 1992-06-03
EP0487601B1 true EP0487601B1 (fr) 1995-05-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90912875A Expired - Lifetime EP0487601B1 (fr) 1989-08-17 1990-08-17 Dispositif d'aide a l'audition par conduction osseuse

Country Status (9)

Country Link
US (1) US5447489A (es)
EP (1) EP0487601B1 (es)
AT (1) ATE122226T1 (es)
AU (1) AU6278790A (es)
DE (1) DE69019356T2 (es)
DK (1) DK0487601T3 (es)
ES (1) ES2074579T3 (es)
FR (1) FR2650948A1 (es)
WO (1) WO1991002503A1 (es)

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Also Published As

Publication number Publication date
DK0487601T3 (da) 1995-10-09
ATE122226T1 (de) 1995-05-15
WO1991002503A1 (fr) 1991-03-07
US5447489A (en) 1995-09-05
EP0487601A1 (fr) 1992-06-03
AU6278790A (en) 1991-04-03
DE69019356T2 (de) 1996-02-08
DE69019356D1 (de) 1995-06-14
ES2074579T3 (es) 1995-09-16
FR2650948A1 (fr) 1991-02-22

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