EP0340594B1 - Hearing aid device with wireless remote control - Google Patents

Hearing aid device with wireless remote control Download PDF

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Publication number
EP0340594B1
EP0340594B1 EP89107384A EP89107384A EP0340594B1 EP 0340594 B1 EP0340594 B1 EP 0340594B1 EP 89107384 A EP89107384 A EP 89107384A EP 89107384 A EP89107384 A EP 89107384A EP 0340594 B1 EP0340594 B1 EP 0340594B1
Authority
EP
European Patent Office
Prior art keywords
hearing aid
remote
control
signals
microphone
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
EP89107384A
Other languages
German (de)
French (fr)
Other versions
EP0340594A1 (en
Inventor
Gerhard Dr. Steeger
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 GmbH
Original Assignee
Sivantos GmbH
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
Priority to DE3815598 priority Critical
Priority to DE3815598 priority
Application filed by Sivantos GmbH filed Critical Sivantos GmbH
Publication of EP0340594A1 publication Critical patent/EP0340594A1/en
Application granted granted Critical
Publication of EP0340594B1 publication Critical patent/EP0340594B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/60Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/604Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers
    • H04R25/606Mounting 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/55Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/558Remote control, e.g. of amplification, frequency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/61Aspects relating to mechanical or electronic switches or control elements, e.g. functioning
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/67Implantable hearing aids or parts thereof not covered by H04R25/606

Description

  • The invention relates to a hearing aid with wireless remote control according to the preamble of claim 1.
  • A hearing aid of this type is known from DE-A-1 938 381. It is known that hearing aids should be as small as possible so that they can be worn inconspicuously. This has resulted in miniature hearing aids that are worn on the head, particularly those that can be inserted into the ear canal. In this type of device too, at least the volume, but possibly also a number of other functions essential for adapting to different listening situations, should be able to be changed in operation. This requires adjustment devices that are accessible while the device is in operation in contact with the carrier. In addition, the handling area should be clear when setting. This is achieved, for example, with a hearing aid according to DE-A-1 938 381. For this purpose, the components are distributed over two housings, one of which contains a transmitter that is wirelessly connected to the other, in which the actual hearing aid is located together with a receiver that is tuned to the transmitter. However, the housing, which contains both the hearing aid and the receiver, offers very little volume. Especially the so-called "in-the-ear devices" that are worn in the ear canal rarely have more than 100 mm³ of free space for the installation of a remote control receiver. Therefore, the aim was to get by with a receiver that does not require an additional sensor, antenna or the like.
  • From DE-A-3 431 584 and from the corresponding EP-A-0 175 909 there is also a hearing aid with remote control known according to the preamble of claim 1. In this known hearing aid, the microphone of the hearing aid is also used as the receiving element for the remote control signals. Inaudible sound, in particular ultrasound, is used to transmit the remote control signals. The ultrasound transmitter is located in a control unit in which the control signals are generated via a keyboard and emitted via a loudspeaker, and in the hearing aid the derivation of the signals picked up by the microphone is split into two branches, one of which is inserted into the hearing aid and the other a filter blocking all signals except the ultrasound signals leads to the control part of the hearing aid.
  • A hearing aid apparatus is known from FR-A-1 113 759, which is essentially formed from two modules for speech sound transmission by means of structure-borne sound. A first module can conduct sound with the head of the hearing impaired, e.g. in its mouth with a tooth. The second module, which picks up the speech sound via a microphone, is via a transmitter to a bone, e.g. the hip or arm, the hearing impaired. For the transmission of the speech sound signals by means of structure-borne sound, ultrasound is used as the auxiliary frequency, on which the speech sound signals are modulated. This known hearing device has no remote control.
  • By using the remote control, a hearing aid is largely freed from the ballast of actuators and switches. The following functions essentially take place in the remote control: After pressing an operating button, the transmitter electronics recognizes this process and the control signal is coded and transmitted according to the desired function. The inverse process takes place in the receiver. The signal is received, decoded, recognized and the electronic control element is actuated. For the remote transmission of the control signals, electromagnetic transmission, infrared transmission and the ultrasound transmission described above have already been proposed (DE-C-2 407 726).
  • A comparison of these types of transmission with regard to their suitability for remote control for hearing aids shows that each of the transmission paths can be influenced by specific sources of interference. In the case of electromagnetic transmission, a large number of electromagnetic interference sources must be taken into account. In addition, the free choice of transmission frequencies is very limited due to country-specific postal regulations and varies greatly from country to country. With infrared transmission, direct sunlight on the receiver diode can cause problems and the receiver diode must be attached to an exposed location on the hearing aid. The ultrasonic path can be replaced by sound sources, e.g. an ultrasonic cleaning bath. Additional components are required to receive the control signals for electromagnetic transmission and infrared transmission, while the existing microphone can be used for ultrasound transmission. However, it has been shown that because of the known special propagation conditions of ultrasound, the main emission direction of the loudspeaker in the remote control transmitter must be aimed very precisely in the direction of the ear canal opening in order to be able to control in-the-ear hearing aids. To do this, lift the transmitter relatively high or at least keep it far from the body. Aiming for people with limited spatial awareness is relatively difficult because it has to take place without direct visual control. In addition, such handling is unpopular with many patients because they fear that it could draw the attention of the interlocutor to their disability. These problems can increase if hearing aids are placed even deeper in the ear canal. These can be even smaller ear canal hearing aids, but above all implanted hearing aids, as have already been described variously (DE-A-3 617 118).
  • The invention is based on the object of providing a hearing aid (in particular in-the-ear hearing aids, implanted hearing aids) create magnetic or mechanical excitation of the middle ear) with wireless remote control, which is improved with respect to the transmission of the remote control signals and enables a more inconspicuous use of the remote control.
  • According to the invention, this object is achieved by the features characterized in claim 1. Advantageous embodiments of the invention are characterized in claims 2 to 15.
  • According to the invention, too, sound (outside the hearing range) is used as a transmission medium for remote control signals, but these remote control signals are transmitted to the skeleton, in particular the cranial bone of the hearing aid wearer, by bone sound excitation and not, as in the known designs, to the outer ear by airborne sound transmission. A suitable design of the remote control transmitter ensures that the remote control is possible completely inconspicuously, namely by the hearing aid wearer holding the small control device in his hand and executing movements for transcutaneous contact of the control device contact area with his bone structure. These movements can only be interpreted by the conversation partners of the hearing aid wearer as "adjusting glasses", "stroking hair", "headrests" or similar.
  • The hearing aid according to the invention works in the remote control part with structure-borne sound waves, in particular in the ultrasound or in the low-frequency range outside the hearing range, which are emitted by the vibrator of the remote control device in such a way that when the control device is placed on the scalp, for example, above the rock or temporal bone stimulate the skull bone to vibrate. These vibrations are transmitted to the hearing aid inserted in the ear canal and to a sound transducer present in the hearing aid, which converts them into an electrical signal. The decoding of this signal gives the control signal for setting the hearing aid functions.
  • Further features and advantages of the invention are explained on the basis of the exemplary embodiments shown in the drawing. It shows:
    • 1 shows a block diagram of a control device according to the invention for wireless remote control of a hearing aid device to be worn on the head,
    • 2 shows a control unit according to FIG. 1 to be held in the hand,
    • 3 shows a hearing aid inserted into an auditory canal with a microphone for the speech sound signals and another Sound converter for converting structure-borne sound signals into electrical control signals,
    • 4 shows a hearing aid inserted into an auditory canal with a common transducer for the useful and control signals and a permanent magnet implanted in the middle ear,
    • 5 shows a fully implanted hearing aid with a microphone for the speech sound signals and a structure-borne sound microphone.
  • The control device 1 provided for remote control of the hearing aids shown in FIGS. 3 to 5 is a handy, small, battery-operated device in the embodiment according to FIGS. 1 and 2, the housing of which can be designed ergonomically. For triggering the function changes to be effected remotely in the hearing aid device (for example setting the volume, switching the hearing aid device off and on, operating one or more tone diaphragm circuits, switching a circuit for automatic noise suppression on or off, switching the hearing aid device from microphone to telecoil operation, etc.) the control unit has, for example, an operating panel 2 with sensor buttons 3. The control unit contains a coding circuit 4, which generates a serial sequence of data and test bits in accordance with the programming or control command effected by touching the sensor buttons 3 and which repeatedly transmits to a modulator 6 at the transmission clock frequency determined by the frequency of a clock generator 5 until a timing circuit also fed by the clock generator 5 ends the transmission and switches the control unit back to the ready state. In the modulator 6, the serial information received from the coding circuit 4 of the oscillation generated in a generator 7 is modulated and shifted into a carrier frequency range which can be transmitted inaudibly or at least not disturbingly acoustically to the human skeleton. An audible airborne sound emission into the room is excluded in any case. The modulator 6 is a power amplifier 8, which raises the output signal to a power level that is sufficient for reprogramming the hearing aid, and a vibrator 9 with a contact surface 10, which is used for transcutaneous coupling of the programming or control signal emanating from the vibrator to the bony skeleton of the hearing aid wearer.
  • According to the invention, the selection of the operating function by means of the sensor buttons 3 can take place before the control device 1 is placed on the skin in order to carry out the remote control as inconspicuously as possible. While switching to the body surface, the actuation of switching elements is not absolutely necessary, but is still possible. A simple variant consists in letting the transmitter work for a fixed time (e.g. 5 seconds) after removing the fingers from the control element or the sensor keys and then switching it off.
  • According to a further variant, the control device 1 remains active as long as the contact surface 10 of the vibrator 9 is in contact with the skin. In this case, the control device can be switched on and off by sensor strips on the contact surface 10 or by movable mounting of the vibrator 9 in connection with a microswitch.
  • This form of sequence control also minimizes the energy consumption of the control unit.
  • FIG. 2 shows an embodiment of the housing design of the control device 1 as a flat control device which is adapted to the shape of the hollow hand and has a non-slip coating on the back (facing the hand). In this embodiment, the control device, hidden in the slightly curved hand, can be guided inconspicuously, for example, to the head. The grip and operation of the control device with one hand favors a recessed grip 11. To adjust the function that can be preselected via the sensor buttons 3, a switch 12 that can be actuated by a wheel can be used, for example serve, which is indicated in Figure 2 under the thumb on the control device and strengthens the function (eg volume) when moving in the direction of the thumb tip, decreases the function when moving in the direction of the thumb root. This switch 12 or its actuating wheel preferably assumes a neutral central position when the load is released. If this switch 12 is not required for a simple switchover function (eg microphone off, hearing coil for telephone operation on), it remains inoperative.
  • In Figure 3, the outer ear 13 with ear canal 14, the middle ear with eardrum 15, hammer 16, anvil 17, stirrup 18, tympanic cavity 19, oval window 20, round window 21, Eustachian tube 22 and inner ear with arches 23, snail 24 and Auditory nerve 25 shown. In the ear canal 14, an in-the-ear hearing aid is used which has a housing shell 26 which is adapted to the ear canal and in which a microphone 27 for converting the speech sound signals into electrical signals is arranged such that the microphone 27 is decoupled from the housing 26 in relation to structure-borne sound excitation . Furthermore, a second sound transducer 28 is provided in the housing 26 of the in-the-ear hearing device, but in such a way that the sound transducer 28 is coupled to the housing shell for the purpose of structure-borne sound excitation and can receive the signals transmitted by structure-borne sound for controlling and programming the hearing aid device and convert them into electrical control commands . The receiver 29 of the hearing aid device is designated by 29, which receives the electrical signals emitted by the microphone 27 and amplified and reshaped in an amplifier circuit 30 (for example filtered and / or reduced in dynamics), converts them into sound vibrations and emits them in the direction of the eardrum 15. Contact springs 32 are provided for contacting a circuit board of the amplifier circuit 30 with a battery 31. The sound transducer 28 built into the hearing aid can be a microphone specially developed for the transmission frequencies and mechanically well coupled to the housing wall of the hearing aid, which microphone is present in addition to the normal microphone 27 that receives the speech signals.
  • In the embodiment according to Figure 4, the sound transducer provided for the speech signals is used, i.e. the microphone 33, at the same time as a sound transducer for the structure-borne sound signals for remote control of the hearing aid. The remote control signals are separated from the speech signals by a frequency-selective circuit known per se, e.g. using high and low pass filters. In an advantageous embodiment, the sound transducer 33 is mounted in a plastic pocket 34, which causes a high attenuation in the listening area, but as low as possible at the carrier frequencies of the remote control signals. According to Figure 4, the sound transducer 33 is supported by the plastic part 34 on the housing shell 26 and at the same time embedded in plastic.
  • In this hearing aid with a magnetically excitable middle ear implant formed by a permanent magnet 36, the hearing aid itself can be removed from the auditory canal 14 without any intervention. For exciting the permanent magnet 36, which e.g. is attached to the stirrup 18 of the ear by a screw or adhesive connection, an excitation coil 35 is arranged in the housing shell 26 of the hearing aid device and is connected to the amplifier circuit 30. The excitation coil 35 is fed with the amplified electrical output signal of the circuit 30 and this signal is transmitted in the form of an alternating magnetic field to the small permanent magnet 36 attached to the stirrup 18. The permanent magnet set in vibration transmits the speech sound signals to the inner ear. To attach the permanent magnet 36, the middle ear is opened and the anvil of the ear removed.
  • The fully implantable hearing aid according to FIG. 5 consists of a liquid-tight and gas-tight housing 40 of an amplifier part 41 made of tissue-compatible material, which is used for fixation, but especially for structure-borne sound transmission by means of a screw 50 or the like. is attached to the skull 42. Furthermore, a microphone 43 is implanted in the area of the auditory canal 14, which is the through the ear canal guided speech sound signals and in the form of electrical signals via an electrical line 44 to the input of the amplifier part 41. Finally, a piezoelectric vibrator 45 is attached to the skull bone in such a way that the free end 46 of the vibrator 45 causes the stirrup 18 to vibrate as soon as it deforms under the influence of the electrical alternating voltage transmitted from the output of the amplifier part 41 via an electrical line 47. The anvil and hammer are removed for the implantation of the vibrator 45. The circuit board with integrated and discrete components of the amplifier part 41 is supplied from a connected battery 49. In the case of an implantable hearing aid device with mechanical vibrator 45 for stirrup excitation, the amplifier part 41 containing the battery 49 can also be fully implanted because of the low power consumption. Then an effective coupling of the remote control signals is possible in that the amplifier part 41 is screwed to the cranial bone 42 and a structure-borne sound microphone 48 (structure-borne sound vibration sensor) is brought into mechanical contact, for example via a connecting web 51, with the screw 50.
  • If the amplifier part 41 is not to be fully implanted or a screw connection is not possible for other reasons, the screw connection of the vibrator 45 (near the stirrup 18) can serve as a contact point for the structure-borne sound transmission, the structure-borne sound vibrations then either mechanically via a stiff wire, Connecting bridge or the like (between the screw connection of the vibrator 45 and the structure-borne sound microphone 48 of the amplifier part) or electrically, by screwing a microphone onto the screw connection of the vibrator 45.

Claims (15)

  1. Hearing aid device having wireless remote control of at least parts of its controllable functions, with not only elements of the hearing aid, but also those elements for the control of its functions and a receiver for remote-control signals for the control of these functions being accommodated in a housing which can be worn on the head, with the receiver for the remote-control signals having a sound transducer which is connected by way of an amplifier and also by way of a decoding and recognition unit with at least one control part of the hearing aid device and with the remote-control signals being emitted with a remote-control frequency outside the human hearing range by means of a control device (1) which can be held in the hand and which contains in particular an operator panel (2), a recognition and coding unit and also a transmitter, characterised in that a vibrator (9) is provided as a transmitter in the control device (1), which vibrator emits the remote-control signals by way of body-borne sound excitation to the skeleton of the wearer of the hearing aid device, in that the remote-control signals of the transmitter can be transmitted, by means of transcutaneous coupling of a contact surface (10) of the control device (1), as body-borne sound signals to the receiver and in that the sound transducer of the receiver for the remote-control signals is a sound transducer (28; 33; 48) which converts the body-borne sound signals into electrical signals.
  2. Hearing aid device according to claim 1, characterised in that a microphone (33) for voice sound signals of the hearing aid device is provided as sound transducer (28; 33; 48) for receiving and transforming the body-borne sound remote-control signals, with the microphone (33) being arranged in a housing shell (26), which can be inserted into the auditory canal (14), in such a way that the microphone (33) is supported in respect of the housing shell (26) by means of a plastics moulded portion (34) which acts in an attenuating manner on disturbing acoustic interference in the audio frequency range, yet forms a bridge for the body-borne sound remote-control signals to the microphone and in that arranged after the microphone (33) there is a frequency-selective circuit arrangement for the separation of the body-borne sound remote-control signals from the voice signals.
  3. Hearing aid device according to claim 1 and 2, characterised in that the body-borne sound remote-control signals are supplied as electrical remote-control signals by way of the frequency-selective circuit arrangement to the connected control parts for the execution of the control commands and in that the electrical voice signals are fed, by way of the frequency-selective circuit arrangement, into an excitation coil (35) which is likewise arranged in the housing shell (26), and in that the excitation coil (35) transmits the voice signals in the form of a magnetic alternating field to a permanent magnet (36) which can be secured to the stapes (18) of the ear and which is set into motion by means of the magnetic field of the excitation coil and as a result transmits the voice signals to the internal ear.
  4. Hearing aid device according to claim 2, characterised in that the microphone (33) is embedded in plastics material, in particular foamed plastics material, and this plastics embedding (34) rests in a planar manner against the housing shell (26).
  5. Hearing aid device according to claim 2, characterised in that the microphone (33) is mounted in a plastics pocket (34) or the like which has a high attenuating characteristic in the hearing range and a low attenuating characteristic in the remote-control frequency range.
  6. Hearing aid device according to claim 1, characterised in that an arrangement, which can be inserted into the auditory canal (14), is provided in a housing shell (26) for receiving and transforming the body-borne sound remote-control signals, which arrangement has, in addition to a microphone (27) as a sound transducer for the voice sound signals, a further sound transducer (28) which is tuned to the remote-control frequency of the control device (1), with the microphone (27) for the voice sound signals being dampened and being decoupled from the housing shell (26) and the sound transducer (28) for the body-borne sound remote-control signals being coupled to the housing shell (26).
  7. Hearing aid device according to claim 1, characterised in that a fluid- and gas-tight housing (40) with an amplifier portion (41) can be secured in a fully implantable manner to a cranial bone (42), in that a microphone (43) is provided, which microphone receives the voice sound signals conducted through the auditory canal (14) and is electrically connected with the amplifier portion (41) by means of a line (44), in that a piezoelectric, further vibrator (45) can be secured to the cranial bone and with its free end (46) excites the stapes (18) of the ear when an electric voltage from a voice sound signal is applied, which voltage comes from the amplifier portion (41) and is supplied by way of an electrical line (47), in that there are provided in the housing (40) of the amplifier portion (41) a frequency-selective circuit arrangement for the separation of the body-borne sound remote-control signals from the voice signals, as a circuit board with integrated and discrete electronic components or the like, and also a body-borne sound microphone (48) which is coupled to the wall of the housing (40) for the conversion of the body-borne sound remote-control signals into electrical control signals.
  8. Hearing aid device according to claim 7, characterised in that the housing (40) of the amplifier portion (41) can be secured to the cranial bone (42) by means of a screw (50), a pin or the like and in that the body-borne sound microphone (48) is mechanically connected with the securing element (50).
  9. Hearing aid device according to claim 7, characterised in that the body-borne sound microphone (48) is arranged at the point of securement of the piezoelectric, further vibrator (45) and is connected with the amplifier portion by means of an electrical line.
  10. Hearing aid device according to claim 7, characterised in that for the purpose of transmitting the body-borne sound remote-control signals the body-borne sound microphone (48) is coupled to the point of securement of the piezoelectric, further vibrator (45) by means of a mechanical connection, a wire, bar or the like.
  11. Hearing aid device according to claim 1, characterised in that the control device (1) has a housing which is adapted to the form of the palm of the hand and is otherwise flat.
  12. Hearing aid device according to claim 1, characterised in that the housing of the control device (1) has on the rear side remote from the operator panel (2) a non-slip coating, surface or the like.
  13. Hearing aid device according to claim 1, characterised in that the housing of the control device (1) has the contact surface (10) of the control device (1), which surface is to be applied to the skin above a bone which is close to the surface (of the skin).
  14. Hearing aid device according to claim 1, characterised in that the control device (1) can be switched on and/or off by means of keys (3) of the operator panel (2), by means of sensors on the contact surface (10) of the control device (1), by means of a movable mounting of the contact surface (10) or the like.
  15. Hearing aid device according to claim 1, characterised in that there is provided in the control device (1) a coding circuit arrangement (4) which generates a serial sequence of data and check bits in accordance with the programming command triggered by the operator panel (2) and transmits this sequence constantly and repeatedly to a modulator (6) with the remote-control frequency determined by the frequency of a clock generator (5) until a timing circuit arrangement, which is likewise fed by the clock generator, terminates the transmission and switches the control device (1) back into a stand-by state.
EP89107384A 1988-05-06 1989-04-24 Hearing aid device with wireless remote control Expired - Lifetime EP0340594B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3815598 1988-05-06
DE3815598 1988-05-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT89107384T AT91057T (en) 1988-05-06 1989-04-24 Hearing aid with wireless remote control.

Publications (2)

Publication Number Publication Date
EP0340594A1 EP0340594A1 (en) 1989-11-08
EP0340594B1 true EP0340594B1 (en) 1993-06-23

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EP89107384A Expired - Lifetime EP0340594B1 (en) 1988-05-06 1989-04-24 Hearing aid device with wireless remote control

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US (1) US5012520A (en)
EP (1) EP0340594B1 (en)
JP (1) JPH01318500A (en)
AT (1) AT91057T (en)
DE (1) DE8816422U1 (en)

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US5012520A (en) 1991-04-30
DE8816422U1 (en) 1989-08-10
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EP0340594A1 (en) 1989-11-08

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