CN109604602B - Manufacturing method of 3D printing hearing aid shell - Google Patents
Manufacturing method of 3D printing hearing aid shell Download PDFInfo
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- CN109604602B CN109604602B CN201910098661.5A CN201910098661A CN109604602B CN 109604602 B CN109604602 B CN 109604602B CN 201910098661 A CN201910098661 A CN 201910098661A CN 109604602 B CN109604602 B CN 109604602B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a manufacturing method of a 3D printing hearing aid shell, which comprises the steps of firstly carrying out three-dimensional reconstruction on medical image data of a hearing-impaired person to obtain three-dimensional data of an auditory canal of the person, forming a model by utilizing three-dimensional software, then designing and optimizing the model by utilizing the three-dimensional software according to the reconstructed three-dimensional data, printing the optimized model by a 3D metal printer to form the shell, and carrying out post-processing work on the shell. According to the manufacturing method of the 3D printing hearing aid shell, the printed technical material is titanium metal or titanium alloy, the printing is performed by using a 3D metal printer, customization can be achieved according to personal conditions, the shell can be thin, a plurality of hearing aid elements including electronic elements and various other structures can be placed in the shell, the shell is comfortable to wear by people, and installation of hearing aid equipment is facilitated. Because its stronger laminating degree, make the person of wearing can feel stable sound transmission, tone quality is more clear, and is difficult for the hypersensitivity.
Description
Technical Field
The invention belongs to the technical field of manufacturing hearing aids by using a 3D printing technology, and particularly relates to a manufacturing method of a 3D printed hearing aid shell.
Background
The essence of a hearing aid is an amplifier that amplifies sound in a way that makes it possible for a hearing impaired person to effectively use his residual hearing. The hearing aid is mainly composed of a microphone, an amplifier, a receiver, a power supply and a shell. The non-customized hearing aid and the customized hearing aid are classified according to the manufacturing mode of the shell. The shape of the shell of the non-customized hearing aid is single, the shell can not well adapt to the shapes of different human ears, and local compression and gaps are easily formed on the auditory meatus and the concha cavity, so that the non-customized hearing aid is not enough to be worn: uncomfortable to wear, easy to fall off and poor in sound insulation effect. However, the conventional customized hearing aid shell is generally manufactured by hand, and is finished by a series of manual operations such as ear impression making, ear impression waxing, female die taking, photosensitive resin injection, curing forming, grinding and polishing and the like, so that the manufacturing time is long, the cost is high, and the whole process is finished by hand, and although the fitting degree with the human ear is better than that of an unscheduled hearing aid, certain errors still exist. Because the photosensitive resin is of low strength, the hearing aid housing cannot be made too thin, and therefore, for a small-sized hearing aid with a deep-canal type, the mounting of the electronic components is also difficult. In addition, the photosensitive resin has general biocompatibility, so that the photosensitive resin is easy to cause anaphylactic reaction after being worn for a long time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for manufacturing a 3D printing hearing aid shell, and the shell manufactured by the method has the advantages of wearing comfort, difficulty in falling off, good sound insulation, biocompatibility and high strength.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows: a manufacturing method of a 3D printing hearing aid shell comprises the steps of firstly conducting three-dimensional reconstruction on medical image data of a hearing-impaired person to obtain three-dimensional data of an auditory canal of the hearing-impaired person, forming a model by utilizing three-dimensional software, then conducting design and optimization on the model by utilizing the three-dimensional software according to the reconstructed three-dimensional data, printing the optimization model by a 3D metal printer to form the shell, and conducting post-processing work on the shell.
The model design and optimization steps are as follows:
step 1: opening a CT/MRI medical image, determining the directions of three views to be correct, and processing the model by using three-dimensional software to reduce noise processing;
step 2: determining a threshold value according to the required ear canal tissue, determining the threshold value of the required ear canal tissue according to the section line, generating a mask, packaging and converting into a triangular patch;
and step 3: carrying out surface fitting on the model converted into the triangular patch by using three-dimensional software to form a curved surface, drawing a section line, editing the number of layers, determining a threshold value, deleting and filling the required ear canal tissue, extracting the required ear canal tissue, increasing the region, carrying out region increase on the extracted ear canal tissue to generate a new mask, and finally converting into a solid model;
and 4, step 4: the solid model is modified by three-dimensional modeling software, and the solid model is cut by two planes;
and 5: the first cutting position is a second bend of the auditory canal, the cutting direction is the normal direction of the auditory canal axis, and the second cutting position is determined according to the type of the hearing aid;
step 6: and (5) carrying out thin-wall treatment on the modified solid model by using three-dimensional modeling software, and setting the thickness of the thin wall.
After thin-wall processing, the cover sealing interface, the sound outlet and the air vent of the auricle die are configured by using three-dimensional modeling software, and flaw repairing and printing are carried out on the finally formed model.
In step 4 above, the plane of resection is through the point of the intertragic notch and is parallel to the axis of the first bend of the ear canal.
The post-treatment work includes polishing, sandblasting and coloring the printed surface of the housing.
Further, the thickness of the side wall of the housing is set to 0.15mm to 0.25 mm.
Further, the thickness of the cover interface at the outer end part of the shell and the thickness of the inner end part of the shell are set to be 2mm-2.5 mm.
The metal material used by the 3D metal printer is medical titanium metal powder or titanium alloy powder with biocompatibility, and the metal material is manufactured in an intelligent manufacturing mode of selective laser melting.
And 6, optimizing and slicing the solid model after thin-wall processing, importing the slice file into a 3D metal printer with set parameters, generating an X-Y laser scanner from the planar geometric information of each layer of slice of the CAD model, forming a numerical control motion instruction on each layer of powder, and paving the powder on the forming platform layer by a powder paving device of the 3D metal printer.
And further, rolling and compacting the powder paved on the platform, wherein the thickness of each layer of powder is consistent with the slice thickness of the CAD model, each layer of powder is sintered on the substrate by the laser scanner according to set parameters, and the substrate descends one layer after each layer of powder is sintered until the whole shell is sintered.
According to the manufacturing method of the 3D printing hearing aid shell, the printed technical material is titanium metal or titanium alloy, the printing is performed by using a 3D metal printer, customization can be achieved according to personal conditions, the shell can be thin, a plurality of hearing aid elements including electronic elements and various other structures can be placed in the shell, the shell is comfortable to wear by people, and installation of hearing aid equipment is facilitated. Because its stronger laminating degree, make the person of wearing can feel stable sound transmission, tone quality is more clear, and is difficult for the hypersensitivity.
Drawings
FIG. 1 is a cross-sectional view of an ear canal of the present invention;
fig. 2 is a three-dimensional structural view of a hearing aid according to embodiment 1 of the present invention;
fig. 3 is a view showing the internal structure of a hearing aid according to embodiment 1 of the present invention;
FIG. 4 is a view showing the structure of a closure in accordance with embodiment 1 of the present invention;
FIG. 5 is a view showing the construction of a battery container connecting cover in accordance with embodiment 1 of the present invention;
FIG. 6 is a structural view of a battery pack in accordance with embodiment 1 of the present invention;
FIG. 7 is a view showing the structure of a vent hole of a casing in embodiment 1 of the present invention;
in the figure: 1-a housing; 2-sealing the cover; 3-a sound hole; 4-volume control key; 5-a battery compartment; 6-a stay wire; 7-eardrum; 8-ear canal; 9-a first bend; 10-second bend; 11-auricle; 12-an amplifier; 13-a receiver; 14-connecting lines; 15-a microphone; 16-a rotating shaft; 17-step gap; 18-a sound outlet; 19-a vent hole; 20-stud bumps; 51-a hook; 52-Bar shaped protrusions.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1, the method for manufacturing a 3D printed hearing aid shell comprises the following steps: the method comprises the steps of carrying out three-dimensional reconstruction on medical image data of a hearing-impaired person to obtain three-dimensional data of an auditory canal 8 of the person, forming a model by using three-dimensional software, designing and optimizing the model by using the three-dimensional software according to the reconstructed three-dimensional data, printing by using a 3D metal printer after the model is designed, and carrying out post-processing work after the model is printed.
Specifically, the steps of designing and optimizing include:
step 1: opening the CT/MRI medical image, determining the directions of the three views to be correct, and processing the model by using three-dimensional software to reduce noise processing.
Step 2: and determining a threshold value according to the required ear canal tissue, determining the threshold value of the required ear canal tissue according to the section line, generating a mask, packaging and converting into a triangular patch.
And step 3: carrying out surface fitting on the model converted into the triangular patch by using three-dimensional software, forming a curved surface, drawing a section line, editing the number of layers, determining a threshold value, deleting and filling required auditory canal tissues, extracting the required auditory canal tissues, increasing the regions, carrying out region increase on the extracted auditory canal tissues, generating a new mask, and finally converting into a solid model.
And 4, step 4: and (3) modifying the solid model by using three-dimensional modeling software, and cutting off the solid model by using two planes.
And 5: the first cut-off position is the second bend of the auditory canal, the cut-off direction is the normal direction of the auditory canal axis, and the second cut-off position is determined according to the model of the hearing aid.
Step 6: and (5) performing thin-wall treatment on the modified solid model by using three-dimensional modeling software, and setting the thickness of the thin wall as required.
Configuring a rear cover interface, a sound outlet and a vent hole of the model by using three-dimensional modeling software; and repairing flaws of the finally formed model and printing the flaws by using a metal material.
The plane cut in the step 4 passes through the point of the intertragic notch and is basically parallel to the axis of the first bend of the auditory canal, certain error is allowed, and the included angle between the cut plane and the axis is controlled within 15 degrees.
The shell can be made of metallic titanium or titanium alloy or magnesium-aluminum alloy, but the surface of the magnesium-aluminum alloy is provided with a fluorine coating layer.
And polishing, sand blasting and coloring the surface of the printed titanium alloy shell according to the setting.
Preferably, the thickness of the side wall of the housing is 0.15mm to 0.25mm, and the wall thickness of the outer end and the inner end of the housing is 2mm to 2.5 mm.
In addition, the shell is made of biocompatible medical titanium metal powder or titanium alloy powder in an intelligent manufacturing mode of selective laser melting.
After mould taking and design, a hearing aid model conforming to the ear structure of a hearing-impaired person is made, optimization and slicing processing before printing are carried out, a slice file is guided into a metal printer with set parameters, numerical control motion instructions of an X-Y laser scanner on each layer of powder are generated according to the sliced plane geometric information of each layer of a CAD model, the powder is paved on a forming platform layer by a powder paving device, the powder is rolled and compacted, the thickness of each layer of powder is consistent with the slice thickness of the CAD model, each layer of powder is selectively sintered on a substrate by the laser scanner, one layer is finished when each layer of powder is sintered, and the substrate descends one layer until the whole shell is sintered. The eardrum is preliminarily cut after being subjected to mould taking, the eardrum is scanned by a three-dimensional scanner, then a shell is designed and optimized by three-dimensional software, a 3D metal printer is used for printing after a model is designed, complex post-processing work is carried out after printing is completed, component assembly is carried out after the shell is processed and completed, finally, performance test of a hearing aid is carried out, and the hearing aid can be worn and used after the test is qualified.
As shown in fig. 2 and 3, the hearing aid comprises a shell 1, a cover 2, a battery compartment 5, a battery module, an amplifier 12, a receiver 13, a microphone 15 and a functional module, wherein the shell is internally provided with a cavity for accommodating hearing aid equipment, the shell is provided with an outer end part and an inner end part, the outer end part is connected with the cover, the cover is provided with a sound hole, the inner end part is provided with an inner end surface, the inner end surface is provided with a sound outlet 18, the battery compartment is connected with the cover 2, the battery module is connected into the battery compartment 5, the receiver 13 is arranged at the sound outlet 18, the receiver 13 is connected with the amplifier, the amplifier 12 is connected with the microphone 15, and the microphone 15 is arranged. At first, utilize 3D printing technique preparation shell, after the shell preparation is accomplished, adopt the injection molding method preparation closing cap, be equipped with pivot and step gap on the closing cap, the closing cap passes through the buckle and connects the shell, is equipped with couple and bar bellying on the battery compartment, and the couple of battery compartment connects the pivot, and the bar bellying of battery compartment connects step gap on the closing cap, and battery module connects the function module to set up in the battery compartment, the amplifier passes through the connection of electric lines function module, and the signal receiving end of amplifier adopts the connection of electric lines receiver, is fixed in sound hole department with the receiver, and the signal output part of amplifier connects the microphone, is fixed in sound hole department on the closing cap with the microphone, still is equipped with the volume control key on the closing cap, connects the volume control key the function module.
Specifically, as shown in fig. 1, the hearing aid according to the present invention is a customized hearing aid implemented by 3D printing technology, and the shape of the shell of the hearing aid is formed according to the shape of the auditory canal 8 of the user, and the shell of the hearing aid is fitted to the auditory canal to adapt to the shape and structure of the auditory canal 8. A three-dimensional data model is established according to the shape of the inner cavity of the ear canal 8, specifically as shown in fig. 1, in the figure, an auricle 11, an eardrum 7, the ear canal 8, a first curve 9 and a second curve 10 take the eardrum 7, the ear canal 8, the first curve 9 and the second curve 10 as data core nodes.
The outer end part is provided with a sealing cover interface which is connected with the hearing aid equipment and extends inwards from the outer edge, the sealing cover interface is connected with the sealing cover 2 through a buckle, and the sealing cover interface is provided with a vent hole 19 which extends inwards from the end surface and penetrates through the inner end surface.
As shown in fig. 4, the cover 2 is further provided with a volume control key 4 and a pull wire 6.
The sealing cover 2 is provided with a connecting hole for placing the battery compartment, two sides of the connecting hole are provided with connecting lugs with relative values, a rotating shaft 16 for connecting the battery compartment 5 is arranged between the connecting lugs, and the battery compartment 5 is connected in the square hole.
As shown in fig. 5 and 6, a hook is provided at one end of the battery compartment 5, the hook is hung on the rotating shaft 16, a strip-shaped protrusion 52 is provided at the opposite side of the battery compartment 5 to the hook 51, a step gap is provided at the connection part of the sealing cover corresponding to the strip-shaped protrusion 52, and the strip-shaped protrusion is clamped at the step gap 17.
As shown in fig. 7, a cylindrical boss 20 is provided on the inner wall of the housing 1, and the cylindrical wall surface of the cylindrical boss 20 is joined and integrated with the inner wall of the housing.
A cylindrical cavity for accommodating batteries is arranged in the battery compartment 5, and a switch facing to the outside is arranged on the outer wall of the battery compartment 5.
As shown in fig. 6, the step gap 17 is formed by two steps, and the strip-shaped protrusion 52 includes a strip-shaped protrusion and a slope surface between the two steps, and the slope surface overlaps with the step surface below the step gap 17.
The shell 1 is a titanium metal or titanium alloy shell, a metal titanium or titanium alloy material can form a thin shell wall, a larger cavity can be obtained by the thin shell wall surface, and other equipment of the hearing aid can be contained in the cavity.
The shell 1 is made of titanium metal materials through an intelligent manufacturing mode of SLM (selective laser melting), the materials are medical titanium metal powder, strict testing and screening are carried out, finally, biocompatible materials meeting requirements of a human body are selected, after mold taking and design, a hearing aid model meeting ear structures of hearing-impaired people is made, processing such as optimization and slicing before printing is carried out, a slice file is guided into a metal printer with set parameters, numerical control motion instructions of an X-Y laser scanner on each layer of powder are generated through plane geometric information of each layer of slice of the CAD model, a powder paving device lays the powder on a forming platform layer by layer, the powder is rolled flat and compacted, the thickness of each layer of powder is consistent with that of the slice of the CAD model, each layer of powder is selectively sintered on a substrate by the laser scanner, and each layer of powder is sintered, the base plate is lowered by one layer until the whole hearing aid housing is sintered. The hearing aid shell manufactured by the SLM has strong comprehensive functions, the manufacturing time and labor are reduced, the material utilization rate is improved, and the direct cost is saved; the production process is more flexible; the printing machine can be printed quickly, so that the stock and the capital are reduced; no expensive production equipment is required.
The cover 2 is designed to be unique in the shape of a notch and perfectly matched with the shell of the hearing aid, so that the installation of internal elements is facilitated, and the cover is tightly matched with the shell, so that moisture and other impurities are effectively prevented from entering the hearing aid, and the hearing aid is damaged.
The battery compartment 5 is positioned on the sealing cover, the bottom of the battery compartment is designed in an annular shape, the batteries are taken and placed through a special tool, and the battery compartment can be tightly matched with the sealing cover and is small and secret due to the unique buckle design.
The volume control key of the hearing aid is positioned on the sealing cover 2, the design of a straight line shape is adopted, a special tool is used for adjusting the volume, the volume is adjusted to be larger by rotating in the clockwise direction, and the volume is adjusted to be smaller by rotating in the anticlockwise direction.
The pull wire 6 is positioned on the sealing cover 2 and is a thin transparent plastic wire with a round ball at one end so as to be convenient for taking out the hearing aid.
The size of the vent hole 19, which is located at the edge away from the end of the ear canal, depends primarily on the balance of squeal and blocked ear and the size of the ear canal.
The control module of the hearing aid comprises an input signal processor, a shunt device, a signal processing device, an integration device and a merging output device, the hearing aid is a full digital hearing aid, and a circuit of the hearing aid adopts a logic circuit, so that complex sound signals can be rapidly processed. The spectrum range of the user can be divided into a plurality of frequency bands to be adjusted respectively, so that different hearing losses of the hearing-impaired can be compensated. The voice and the noise can be distinguished, the effects of enhancing the voice and reducing the noise are realized, and the actual needs of the hearing-impaired people are met to the maximum extent.
The hearing aid component and control module can realize the following functions, namely a microphone and a microphone, and the function is to convert an input sound signal into an electric signal; the input signal processor is used for converting the electric signals into digital signals; shunting device-responsible for dividing the digital signal into multiple signal processing channels; signal processing means-having the ability to independently, flexibly and rationally process signals; the integration device can combine the signals transmitted from different channels into high and low frequency parts for operation; the merging output device has the function of merging the high and low frequency signals completed by the previous operation and outputting the merged signals in a digital mode; receiver-responsible for restoring electrical signals to acoustic signals.
The 3D printing customized hearing aid shell is designed and manufactured in a customized manner according to the hearing loss condition and the ear physiological structure of a hearing-impaired person. The appearance of the hearing-impaired person can be designed and manufactured according to the requirements of the hearing-impaired person, and the basic characteristic is small and secret. The shell is 3D prints the titanium alloy shell, be according to hearing disorder person's ear physiological characteristic customization design and manufacturing, demand person's ear structure is laminated completely to its shape, and the shell is thinner, inside operable space is great, the installation of the inside components and parts of being convenient for, compare with traditional audiphone, its volume is littleer, it is more hidden to wear, it is comfortable, and be difficult for droing, its functional module adopts digital module, can the automatic adaptation environment, effectively reduce the noise, eliminate the feedback sound, improve the naturality of sound, authenticity and travelling comfort, improve the definition of speech, improve wearer's language resolving power. The vent hole is beneficial to changing the frequency response of the hearing aid, balancing the pressure in the ear, keeping the ventilation between the auditory canal and the outside, reducing the ear blockage effect and reducing the low-frequency gain.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (8)
1. A manufacturing method of a 3D printing hearing aid shell is characterized in that: the method comprises the following steps of firstly, three-dimensional reconstruction is carried out on medical image data of a hearing-impaired person to obtain three-dimensional data of an auditory canal of the hearing-impaired person, a model is formed by using three-dimensional software, the three-dimensional software is used for designing and optimizing the model according to the reconstructed three-dimensional data, a metal material used by a 3D metal printer is medical titanium metal powder or titanium alloy powder with biocompatibility, and the metal material is manufactured in an intelligent manufacturing mode of selective laser melting; the step of designing and optimizing the model comprises:
step 1: opening a CT/MRI medical image, determining the directions of three views to be correct, and processing the model by using three-dimensional software to reduce noise processing;
step 2: determining a threshold value according to the required ear canal tissue, determining the threshold value of the required ear canal tissue according to the section line, generating a mask, packaging and converting into a triangular patch;
and step 3: carrying out surface fitting on the model converted into the triangular patch by using three-dimensional software to form a curved surface, drawing a section line, editing the number of layers, determining a threshold value, deleting and filling the required ear canal tissue, extracting the required ear canal tissue, increasing the region, carrying out region increase on the extracted ear canal tissue to generate a new mask, and finally converting into a solid model;
and 4, step 4: the solid model is modified by three-dimensional modeling software, and the solid model is cut by two planes;
and 5: the first cutting position is a second bend of the auditory canal, the cutting direction is the normal direction of the auditory canal axis, and the second cutting position is determined according to the type of the hearing aid;
step 6: performing thin-wall processing on the modified solid model by using three-dimensional modeling software, and setting the thickness of a thin wall; and printing the optimized model through a 3D metal printer to form a shell, and performing post-processing work on the shell.
2. The method of making a 3D printed hearing aid housing according to claim 1, wherein: the method comprises the following steps that two ends of a shell are provided with an outer end face and an inner end face, a sealing cover interface is arranged on the outer end face, a sound outlet is arranged on the inner end face, a vent hole penetrating through the outer end face and the inner end face is further formed in the shell, after thin-wall processing is conducted, three-dimensional modeling software is used for configuring the sealing cover interface, the sound outlet and the vent hole of an auricle, and flaw repairing and printing are conducted on a finally formed model.
3. The method of making a 3D printed hearing aid housing according to claim 1, wherein: the plane cut in step 4 passes through the point of the intertragic notch and is parallel to the axis of the first bend of the auditory canal.
4. The method of making a 3D printed hearing aid housing according to claim 1, wherein: the post-treatment work includes polishing, sand blasting and coloring treatment of the printed surface of the housing.
5. The method of making a 3D printed hearing aid housing according to claim 1, wherein: in step 6, the thickness of the side wall of the housing is set to 0.15mm to 0.25 mm.
6. The method of making a 3D printed hearing aid housing according to claim 5, wherein: in step 6, the thickness of the outer end cover interface of the shell and the thickness of the inner end are both set to be 2mm-2.5 mm.
7. The method of making a 3D printed hearing aid housing according to claim 1, wherein:
optimizing and slicing the solid model after thin-wall processing, importing a slice file into a 3D metal printer with set parameters, generating an X-Y laser scanner from the planar geometric information of each layer of slice of the CAD model, forming a numerical control motion instruction on each layer of powder, and paving the powder on a forming platform layer by a powder paving device of the 3D metal printer.
8. The method of making a 3D printed hearing aid housing according to claim 7, wherein: and rolling and compacting the powder paved on the platform, wherein the thickness of each layer of powder is consistent with the slice thickness of the CAD model, each layer of powder is sintered on the substrate by the laser scanner according to set parameters, and the substrate descends one layer after each layer of powder is sintered until the whole shell is sintered.
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| CN111331136A (en) * | 2020-02-10 | 2020-06-26 | 中国科学院金属研究所 | Powder feeding laser 3D printing method for metal thin-wall parts with uniform performance |
| CN111150193A (en) * | 2020-03-10 | 2020-05-15 | 攀枝花三帝科技有限公司 | Multifunctional health-care walking stick based on 3D printing and preparation method thereof |
| CN112233523A (en) * | 2020-11-26 | 2021-01-15 | 马鞍山学院 | Preparation method of human cochlear scala tympani model |
| CN116074727B (en) * | 2023-03-13 | 2023-12-08 | 深圳市鑫正宇科技有限公司 | Manufacturing method of 3D printing hearing aid |
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| GB9914923D0 (en) * | 1998-12-10 | 1999-08-25 | Fagan William F | Method for the manufacture of hearing aid shells |
| US7050876B1 (en) * | 2000-10-06 | 2006-05-23 | Phonak Ltd. | Manufacturing methods and systems for rapid production of hearing-aid shells |
| US8032337B2 (en) * | 2001-03-02 | 2011-10-04 | 3Shape A/S | Method for modeling customized earpieces |
| EP1246505A1 (en) * | 2001-03-26 | 2002-10-02 | Widex A/S | A hearing aid with a face plate that is automatically manufactured to fit the hearing aid shell |
| US7191029B2 (en) * | 2001-06-22 | 2007-03-13 | Siemens Hearing Instruments, Inc. | Rapid prototype fabrication of a monolithic hearing instrument housing with an integrally-fabricated faceplate |
| DK1896239T3 (en) * | 2005-06-27 | 2019-01-14 | Widex As | PROCEDURE AND TOOLS FOR FORMING AN Oblong DEFORMABLE ELEMENT FOR A HEARING |
| KR100965785B1 (en) * | 2008-02-27 | 2010-06-24 | 한국티피엠(주) | a manufacturing method of ITE type hearing aid shell by digital manufacturing process |
| RU2012119267A (en) * | 2009-10-16 | 2013-11-27 | Зшейп А/С | INDIVIDUALLY DESIGNED ELEMENT FROM SOFT MATERIAL |
| CN103974183A (en) * | 2014-05-26 | 2014-08-06 | 俞辰 | Customized earphone based on 3D (three-dimensional) printing technology and manufacturing method thereof |
| DE102014216086A1 (en) * | 2014-08-13 | 2016-02-18 | Sivantos Pte. Ltd. | Device and method for integrating hearing device components |
| CN105877875A (en) * | 2016-05-27 | 2016-08-24 | 华南理工大学 | Personalized thyroid cartilage prosthesis and production method thereof |
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