DE1071892B

DE1071892B -

Info

Publication number: DE1071892B
Application number: DENDAT1071892D
Authority: DE

Description

BUNDE'BUNDE '

DEUTSCHESGERMAN

Für die Hörhilfsgeräte ist ein nach Abdruck angefertigtes sogenanntes Ohrmaßstück erforderlich, um dem Hörer des Gerätes einen festen Halt im Ohr zu geben und darüber hinaus eine akustische Rückkopplung zu vermeiden.For the hearing aid devices, what is known as an ear measure made from an impression is required in order to to give the listener of the device a firm hold in the ear and also provide acoustic feedback to avoid.

Die Herstellung dieser Ohrmaßstücke geschieht bisher auf folgendem Wege. Es wird ein Abdruck des Ohres gemacht, und zwar entweder aus wachsähnlichen Stoffen, Kunststoffen oder Gips. Das Wesentliche beim Abdrucknehmen besteht darin, daß die jeweilige Abdruckmasse anfangs so weich sein muß, daß sie durch das Ohr geformt und nicht das Ohr verformt wird.The production of these ear measuring pieces has so far been done in the following way. It becomes an imprint of the ear, either from wax-like materials, plastics or plaster of paris. That When taking an impression, it is essential that the respective impression material is initially so soft it must be shaped by the ear and not deformed by the ear.

Das durch die Abdruckmasse gewonnene Negativ wird in Gips eingebettet und hierdurch nach Entfernung der Abdruckmasse ein Positiv gewonnen, das alsdann mit hauptsächlich aus der Zahnheilkunde stammenden Kunststoffen z. B. ausgestopft oder aus— gegossen wird.The negative obtained by the impression material is embedded in plaster and thereby after removal A positive was obtained from the impression material, which then came mainly from dentistry originating plastics z. B. stuffed or poured out.

Bei dieser Methode lassen sich Verformungen, die — wenn auch in der Regel nur geringfügig — aber ausschlaggebend sind, nicht ganz vermeiden. Die Umsetzung von Gips und Wasser beim Erhärten des Gipsbreies bzw. das Schrumpfen der verwendeten Kunststoffe erfolgt unter Volumenänderung. Infolge der mehrmaligen Umkehr von der positiven in die negative Form addieren sich die Fehler, so daß das fertige Ohrmaßstück nicht mehr genau der Ohrform entspricht und einen schlechten Sitz des Ohrmaßstückes im Ohr sowie ein schlechte Schallübertragung ergibt. Insbesondere tritt bei elektrischer Schallverstärkung bei ungenügendem Schallabschluß zwischen Ohrmaßstück und Ohr eine akustische Rückkopplung vom Schallerzeuger zum Mikrophon ein, die sich meist durch Pfeifen bemerkbar macht. Beim Anpassen des fertigen Ohrmaßstückes werden daher häufige Nacharbeiten erforderlich.With this method, deformations that - albeit usually only slightly - but are crucial, do not avoid them altogether. The implementation of plaster of paris and water during the hardening of the Plaster of paris or the shrinking of the plastics used takes place with a change in volume. As a result the multiple reversals from the positive to the negative form add up the errors, so that the The finished ear measure no longer corresponds exactly to the shape of the ear and the ear measure fits poorly in the ear as well as poor sound transmission. In particular occurs with electrical sound amplification if there is insufficient sound insulation between the ear measure and the ear, acoustic feedback from the sound generator to the microphone, which is usually noticeable by whistling. When adjusting the finished ear measuring piece therefore requires frequent reworking.

Das Ausgießen des Ohres mit Gips führt außerdem leicht zu Verklebungen im Gehörgang, zumal die Masse beim Hereindrücken in den Gehörgang dort auf keinen Widerstand stößt, der Gehörgang sich vielmehr in der Tiefe wesentlich erweitert und somit die erhärtete Masse nur schwer zu entfernen ist. Auch kann der Schallkanal in den bisher verwendeten Materialien nur nachträglich mit Abwinkelung gebohrt werden, wobei die Sprödigkeit des Materials dem Kanal durchmesser eine bestimmte obere Grenze setzt. Außerdem wird die Schallübertragung zum Gehörgang durch die abgewinkelte Ausführung des Kanals beeinträchtigt.Pouring the ear with plaster of paris also easily leads to adhesions in the ear canal, especially since the mass does not encounter any resistance when it is pushed into the ear canal, the ear canal rather widens in depth and thus the hardened mass is difficult to remove. Also, the sound channel can only be drilled at a later date with angled in the materials used so far, the brittleness of the material setting a certain upper limit to the channel diameter. In addition, the sound transmission to the ear canal is impaired by the angled design of the canal.

Die Erfindung bezweckt vor allem eine Behebung dieser Mängel und den Erhalt eines genau passenden Ohrmaßstückes, und besteht im wesentlichen darin, daß plastisches Material, vorzugsweise. Impressia, ins-Ohrmaßstück für HörhilfegeräteThe main purpose of the invention is to remedy these deficiencies and to obtain a precisely fitting one Ear measuring piece, and consists essentially in that plastic material, preferably. Impressia, in-ear measuring piece for hearing aids

Anmelder:
Deutsche Phonak-GesellschaftApplicant:
German Phonak Society

Sapper & Co.,
Stuttgart-S, Neue Brücke 6Sapper & Co.,
Stuttgart-S, New Bridge 6

Dr. Dr. Georg Halff, Stuttgart-Zuffenhausen, ist als Erfinder genannt wordenDr. Dr. Georg Halff, Stuttgart-Zuffenhausen, has been named as the inventor

Iiesondere also ein Material mit geringem Schwundmaß beim Erhärten, unmittelbar im Ohr in eine der Ohrform entsprechende negative Abdruckform gebracht, hierauf die Abdruckform auf galvanischem Wege mit einer festen metallischen Hülle überzogen und alsdann das die Abdruckform bildende Material unter Beibehaltung der festen Hülle durch ein anderes, formbeständiges, die endgültige Füllung bildendes Material ersetzt wird.In particular, a material with little shrinkage when hardening, directly in the ear in one of the Ear shape brought the corresponding negative impression form, then the impression form on galvanic Paths covered with a solid metallic shell and then the material forming the impression form while maintaining the solid shell by another, dimensionally stable, the final filling forming Material is replaced.

Vorzugsweise wird der Ohrabdruck galvanisch mit einer Hülle aus Kupfer, Silber, Chrom, Nickel od. dgl. in einer Stärke von 0,2 mm überzogen, so daß die durch Schrumpfung bewirkte Formänderung der Abdruckform wieder ausgeglichen wird. Um dies zu erreichen, muß der Abdruck an der Oberfläche leitend gemacht werden. Dies geschieht entweder durch Aufspritzen von Metall oder durch Anwendung von plastischem Metall oder durch Bedecken mit einem Silber- oder Kupferfilm im Kontaktverfahren oder vorzugsweise durch Bestreichen mit Leitfarbe.
Der dem Gehörgang gegenüberliegende Teil des Abdrucks wird durch entsprechende Maßnahmen, z. B. durch Aufbringen der Abdruckform auf eine Platte, durch Lackieren od. dgl. von der Bedeckung mit Metall freigehalten.The ear impression is preferably galvanically coated with a sheath made of copper, silver, chromium, nickel or the like in a thickness of 0.2 mm, so that the change in shape of the impression form caused by shrinkage is compensated for again. In order to achieve this, the imprint must be made conductive on the surface. This is done either by spraying on metal or by using plastic metal or by covering with a silver or copper film in the contact process or preferably by painting with guide paint.
The part of the impression opposite the ear canal is taken by appropriate measures, e.g. B. by applying the impression form to a plate, by painting od. Like. Keep free from the metal cover.

Bei wachsähnlichen Materialien erfolgt das Galvanisieren zweckmäßig zunächst bei Zimmertemperatur, um ein Verziehen des Abdruckes soweit wie möglich auszuschließen, hierauf jedoch zur Beschleunigung des Verfahrens vorteilhaft bei höherer Temperatur, z. B. 40° C. Doch kann auch, insbesondere bei Verwendung von Kunststoffen, das Galvanisieren sofort bei höheren Temperaturen erfolgen.
Nachdem die Abdruckform mit einer Metallhülle von gewünschter Stärke, z. B. 0,2 mm, bedeckt ist, wird das Abdruckformmaterial aus der Metallhülle entfernt und ein zuerst form- oder gießbares, dann z. B. durch Temperaturwechsel oder infolge von Umsetzungen erhärtendes und formbeständiges Material,In the case of wax-like materials, electroplating is best carried out at room temperature in order to exclude distortion of the impression as far as possible. B. 40 ° C. However, especially when using plastics, electroplating can be carried out immediately at higher temperatures.
After the impression form is covered with a metal shell of the desired thickness, e.g. B. 0.2 mm, is covered, the impression molding material is removed from the metal shell and a first moldable or castable, then z. B. by temperature change or as a result of reactions hardening and dimensionally stable material,

90» 690/2690 »690/26

Claims

ζ. Β. liquid wood in the form of a mixture of wood flour and binding agent. During the filling, a preferably arched sound channel is kept free, e.g. B. by inserting a wick, which is removed again after the hardening of the mass, through a bent pipe or the like. It has been shown that such an arcuate sound channel is much better suited for sound transmission than an angled sound channel. The compound used according to the invention allows such a curved sound channel, even with practically any diameter, without difficulty. If the metal shell of the ear measure does not fit perfectly, the imperfections can be corrected with soft solder without difficulty. If after some time, due to the stretching of the ear canal, this ear piece has become too small, the ear piece can be brought back to a suitable size by galvanic reinforcement of the metal shell. Such a reinforcement can, if necessary, also be carried out in ear measuring pieces which have not previously been galvanically produced. The drawing shows an embodiment of the subject matter of the invention. The metal shell 10 envelops the filling compound 11, for. B. liquid wood, through the center of which the curved sound channel 12 runs. The ear-side end of the sound channel, which penetrates the metal shell in a bore 13, can be closed with a membrane 14, which is particularly desirable in the case of chronic middle ear suppuration; The other end of the sound channel is surrounded by a connection ring 15 which is embedded in the filling compound and to which the sound generator 16 is attached in a manner known per se. If necessary, a miniature receiver can also be embedded directly in the mass 11, such as, for. B. is indicated at 16 '. This enables the receiver to be worn particularly inconspicuously. The sound generator 16 is electrically connected to the hearing aid (not shown) via a cable 17. The filling compound 11 replaces the compound used for the impression on the ear, such as Impressia or another substance, which, like Impressia, is characterized by the lowest possible shrinkage when it hardens. 1 'Λ T Ii N T Λ N S I' R 0 C H E:

1. Method of making an individually

Ear measuring piece fitted in the ear for a hearing aid, characterized in that plastic Material placed directly in the ear in a negative impression form corresponding to the ear shape, thereupon the impression form is galvanically coated with a solid metallic shell and then the material forming the impression form while retaining the solid shell through a other, dimensionally stable material forming the final filling is replaced.

2. The method according to claim 1, characterized in that the impression form after covering with an electrically conductive layer, e.g. B. in the contact process, in the spray process or by application

carry a guide color through galvanization with a shell made of copper, silver, chrome, nickel or the like, e.g. B. of about 0.2 mm thickness, is coated.

3. The method according to claim 1 and 2, characterized in that the impression form after covering galvanically copper-plated, nickel-plated, chrome-plated, silver-plated with a conductive layer or gold-plated.

4. The method according to claim 1 to 3, characterized in that the opposite of the ear canal Part of the print by taking appropriate measures, e.g. B. by applying the impression form on a plate, by painting Od. The like., Is kept free from the cover with metal.

5. The method according to claim 1 to 4, characterized in that, when using a wax-like mass for the impression, the impression form of the galvanization first at room temperature and then at higher temperatures, e.g. B. 40 ° C, is subjected.

6. The method according to claim 1 to 4, characterized in that, when using a Plastic compound for the impression, the impression form of the galvanization immediately at higher temperatures is subjected.

7. The method according to claim 1 to 6, characterized in that for filling the metal shell after removal of the impression form a pourable and then, for. B. by temperature change or as a result of reactions, hardening mass, in particular liquid wood in the form of a mixture of wood flour and binding agents.

8. The method according to claim 1 to 7, characterized in that when filling the metal shell a preferably arcuate sound channel, e.g. B. by inserting a wick from the ear the opposite part is kept free from the mass up to the opening of the cap in the ear will.

9. A method for reworking a produced by the method according to claims 1 to 8 Ear measuring piece, characterized in that for adapting the ear measuring piece to the z. B. stretched Ear canal the same is reinforced with an electroplated metal layer.

10. Ear measuring piece produced by the method according to claims 1 to 8, characterized in that that in the preferably flat part of the hardened mass opposite the ear a connection ring for connecting the ear measuring piece to the sound generator is embedded.

11. Ear measuring piece produced according to the method according to claim 1 to 8, characterized in that that the listener, e.g. B. a miniature receiver, embedded directly in the mass of the ear measure is.

12. Ear measuring piece produced according to the method according to claim 4, characterized in that that the end of the sound channel located inside the ear is closed with a membrane.

1 sheet of drawings