(A) the role of otomycosis
Modifying the shape of the ear mold and the size of its various apertures can make up for the lack of acoustic characteristics of hearing AIDS to some extent, further improve the sound quality after listening, and meet the needs of patients in aesthetics and comfort. This is the second function of ear mold.
The third function of ear mold is to make all kinds of hearing AIDS stronger. Especially users of ear hearing AIDS (behind the ear, in the ear, in the ear canal, etc.). ) I am always worried that the hearing aid will be accidentally dropped and damaged. Because the ear mold is made completely according to the shape of the auricle and the ear canal, the physiological structures such as the helix, the concha cavity and the curved part of the external auditory canal will ensure that the ear mold and the hearing aid are firmly worn, and for the box-type hearing aid, the ear mold can also ensure the firmness of the hearing aid receiver.
(2) The history of otomycosis
Our normal ear mold appeared in the 1920s, and the western electrical laboratory applied for the ear mold patent. At that time, there was no customized ear mold, but a series of ear molds of different sizes were made in advance. A dentist in new york, inspired by dental molds, began to customize ear molds according to the shape of each patient's auricle. Since there was no behind-the-ear hearing aid at that time, the shape of the ear mold was the so-called "standard" suitable for box hearing AIDS.
In 1950s, behind-the-ear hearing AIDS appeared, and shell-type and skeleton-type ear molds appeared one after another, but ear canal appeared again. At the same time, the materials of ear impression have also made progress. In the past, Paris plaster was mainly filled into the mouth of external auditory canal and auricle after drying and hardening, so as to obtain an impression from auricle, but the plaster impression was fragile because of excessive force. In the early 1950s, gypsum was replaced by a soft material.
1962, the National Association of Ear Mould Laboratories (NAEL) was established to standardize the shape, material and size of ear moulds. In 1970s, NAEL stipulated the standard size of sound guide tube, named all parts of ear mold uniformly, and took measures to promote the development of new ear mold and new ear pattern materials.
The most basic function of the ear mold is to establish a closed sound hole between the receiving end of the hearing aid and the tympanic membrane, so that the sound outside the ear mold is moderately isolated, and the amplified sound in the ear mold will not leak from the external auditory canal, resulting in acoustic feedback.
What is the eardrum of a hearing aid? What's the role? Ear mold is a coupler connecting human ear and hearing aid, which transmits the output sound of hearing aid from receiver to external auditory canal and tympanic membrane, and plays a role in fixing hearing aid and improving its acoustic characteristics. It is customized according to the shape of the patient's concha cavity and ear canal and the need of hearing compensation.
When purchasing a hearing aid behind the ear, patients are advised to make an ear mold. Which behind-the-ear hearing AIDS are suitable for patients? What's the role?
As we all know, our external ear is about 2.5-3.5 cm long and consists of cartilage and bones. The outer part of the external auditory canal, namely cartilage, accounts for about 1/3 of the length of the external auditory canal. Because of its good elasticity and thick skin and subcutaneous tissue fat, cartilage has better tolerance to external pressure contact than bone. In this way, pain and discomfort are unlikely to occur. However, due to the poor elasticity of bones and the thin thickness of subcutaneous tissue, bones are prone to compressive pain caused by close contact.
Some parts play a special role in the assembly of the ear mold, among which the opening of the external auditory canal and the second bend in the ear canal seal the ear mold; The direction of external auditory canal, helix and antihelix, tragus and antitragus affects the stability of external auditory canal; The difficulty of wearing ear mold is closely related to the length of ear canal, the integrity and shape of concha cavity. The ear mold maker makes the ear mold according to the model provided by the hearing aid fitter. This tests the professional and technical problems of our hearing aid fitter taking ear mold samples from patients. Ear molds can only be said to be well done if they are fitter.
What role does the ear mold play in the process of wearing hearing AIDS?
1, the role of fixed hearing AIDS: Some patients with hearing loss are born with soft auricles, especially children with hearing loss, whose auricles are not fully formed and are softer than adults. Moreover, children have big movements and play over and over again, and the hearing aid is more likely to fall off the auricle. The hearing aid behind the ear is hung on the ear, and the stability of hearing with earplugs is poor. Ear mold is the best way to fix hearing AIDS. If the ear mold is closed well and stably, it will completely contact with the ear canal wall and auricle, which will affect the comfort. Therefore, the ear mold suitable for patients should be customized according to their hearing loss and auricle. Try to consider the patient's comfort.
2. Prevent acoustic feedback: When it comes to acoustic feedback, people in the industry know that the patient dictated the annoying howling from the hearing aid. The reason why behind-the-ear hearing AIDS squeal is that the hearing aid overflows from the ear canal and then enters the microphone of the hearing aid again. The tightness of the ear mold will establish a closed acoustic duct cavity between the hearing aid and the ear canal to prevent this annoying howling. An ear mold that can avoid acoustic feedback does not need to be very closed, and it should be selected according to the acoustic gain required by hearing loss that will not cause feedback.
3. Improve the acoustic characteristics: The ear mold mainly affects the acoustic output, frequency response and acoustic characteristics of the hearing aid according to the material, shape, vent hole, opening mode of vent hole and diameter of sound transmission tube.
Some hearing-impaired patients or their families think that the soft ear mold is soft and will be more comfortable to wear. Soft ear mold is easy to expand with heat and contract with cold because of its soft and elastic material. In summer, when it is hot every day, it will be hot, and it will stick too tightly to the auricle and external auditory canal. Causes the external auditory canal to be airtight, causing eczema and discomfort in the ear canal. However, for patients with extremely severe hearing loss, the soft ear mold is more tightly sealed with the ear canal, so it can enhance the sound output of some hearing AIDS, make the sound louder and make the sound heard by patients fuller.
Hard ear mold is more breathable and more suitable for patients with moderate and severe hearing loss.
Whether the wearer of behind-the-ear hearing aid wears ear mold, what shape ear mold or what material ear mold to wear, must follow the advice of professional fitters to choose. Only in this way can we achieve better stability and better listening effect.
Ear mold also plays an important role.
1. The amplified sound is sealed in the ear canal, so that the sound will sound louder, which can well maintain and improve the output and loudness of the hearing aid.
2. Fixing the function of the hearing aid, the ear mold is customized according to the ear, which can play a good fixing role.
3. Ear mold is comfortable to wear, not loose or tight.
Hearing aid ear mold is specially made for behind-the-ear hearing AIDS and plays a very important role in hearing compensation for deafness. 1. The customized ear mould can improve the hearing aid effect by about 30%. 2. Prevent and reduce howling and noise, and eliminate acoustic feedback howling. 3. Repair the hearing aid. Before the production, audiologists independently design the sound transmission holes, ventilation holes and damping settings of the ear mold according to the needs of the deaf's residual hearing and hearing rehabilitation. The ear mold made according to the design prescription can improve the acoustic characteristics of hearing AIDS and make the hearing aid wearer's effect better.
1. The most basic function of fixing the hearing aid ear mold is to make the hearing aid wear more stable and comfortable. Because the eardrum is completely made according to the shape of auricle and external auditory canal, the physiological structures such as helix, concha cavity and bending of external auditory canal can ensure that the eardrum and hearing aid are worn more stably and meet the needs of patients for comfort and beauty.
2. To prevent the establishment of an acoustic tunnel between the hearing aid with big ears and the eardrum, so that the sound outside the big ears is moderately isolated, and the amplified sound inside the big ears will not leak from the external auditory canal, resulting in acoustic feedback.
3. Improve the acoustic characteristics. Adjusting the shape of the ear mold and the size of various holes can make up for the lack of acoustic characteristics of hearing AIDS to some extent and further improve the sound quality of hearing AIDS.
Hello! 1, the most basic function of fixing the hearing aid ear mold is to make the hearing aid more stable and comfortable to wear. Because the eardrum is completely made according to the shape of auricle and external auditory canal, the physiological structure of external auditory canal, such as helix, concha cavity and bending, can ensure that the eardrum and hearing aid can be worn more stably, and can meet the needs of patients in comfort and beauty. 2. Prevent the sound channel from being established between the hearing aid and the tympanic membrane, so that the sound outside the ear mold is moderately isolated, and the amplified sound inside the ear mold will not leak from the external auditory canal, resulting in acoustic feedback. 3. Improve the acoustic characteristics. Adjusting the shape of the ear mold and the size of various holes can make up for the lack of acoustic characteristics of hearing AIDS to some extent and further improve the sound quality of hearing AIDS.
Hello, hearing aid earmuffs are specially customized earplugs for behind-the-ear hearing AIDS, which play a very important role in hearing compensation for deafness: 1, customized earmuffs can improve the hearing aid effect by about 30%; 2. Prevent and reduce howling and noise, and eliminate acoustic feedback howling; 3. Repair the hearing aid. I hope my answer is helpful to you.
Ear mold is generally used behind the ear, mainly to fix the seal and prevent howling. Generally, eardrums are made of high-power machines.
1, fixing the hearing aid increases the comfort of patients; 2. The part between the external auditory canal buckle and the second bend in the ear canal is called the ear opening of the ear mold, which has a great influence on the sealing performance of the ear mold; 3. It is very important to correct the acoustic characteristics after hearing aid.
The main functions of the ear mold are: 1, fixing the hearing aid 2 and preventing acoustic feedback 3. Improve acoustic characteristics: the acoustic system of the ear mold is composed of ear hook, sound guide tube, sound hole, vent hole and damper. Their different acoustic characteristics will affect the wearing effect of the hearing aid.