The role of ear mold vent

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The second hole in the eardrum, as needed, is called an air vent. The selection and adjustment of air vent plays an important role in the selection and matching of hearing aids. A suitable vent can not only improve the comfort of hearing aid wearing, but also improve the sound quality. On the contrary, if the air vent is not suitable, it will be the hearing aid that will generate feedback scream and make the wearer feel the sound is unnatural, which will cause the patient to refuse to use the hearing aid.

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The acoustic effect of the vent is mainly to reduce the low frequency effect of the hearing aid. Because of the different length and diameter of the pipe, the hearing aid can produce different low frequency attenuation.

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The vent can make the non amplified signal enter the ear canal, especially when the gain of the hearing aid is small and the external signal is strong. It can also improve the ventilation in the ear canal, reduce the sense of occlusion in the ear canal, reduce the humidity in the ear canal, and prevent the immediate infection when the patients with otitis media and hearing impairment wear hearing aids. Therefore, when choosing hearing aids for patients with otitis media and hearing impairment, it is necessary to add air vent.

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1. The effect of the vent on the gambling ear. When the patients with low-frequency hearing loss use hearing aids, they often feel that they are speaking unnaturally and have echo. This is because the volume of the auditory canal becomes smaller after the patients wear hearing aids, and the voice of the hearing impaired patients themselves is transferred into the smaller volume of the auditory canal with the skull vibration. Low frequency resonance is generated, which increases the intensity of low-frequency sound, so the patient feels that the voice of their own speech becomes larger and variable.

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There are two ways to eliminate or reduce the bet ear effect: one is to increase the diameter of the vent and shorten the length of the vent, so as to increase the attenuation of the vent to the low frequency. The second is to increase the ear canal part of the eardrum, so that it exceeds the cartilage part of the ear canal. And close to the cartilage, to reduce the amount of the patient’s own voice into the ear canal.

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2. Vent and feedback squeal effect: when the vent selected by the eardrum does not match the gain of the hearing aid, the hearing aid will generate squeal.

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3. The effect of vent on the performance of hearing aid

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(1) effect on the internal noise of hearing aids: the vent has a attenuation effect on the low-frequency output of hearing aids, as well as on the internal low-frequency noise of hearing aids. For the patients with hearing impairment with low frequency hearing loss, it is beneficial to choose a larger vent when selecting hearing aids.

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(2) the effect on the compression of hearing aid: the vent has no effect on the compression of hearing aid. However, when the pressure of the hearing aid is lowered, the patient still feels the sound is loud, because the sound can enter the ear canal directly through a large vent without going through the microphone of the hearing aid, and the sound does not decay.

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4. Types of vent: there are three types of vent: parallel vent, y vent and external vent. In the process of hearing aid selection, parallel vent is generally preferred. Because, compared with the parallel vent, using Y vent will increase the loss of high frequency signal of hearing aid. Only when the space of ear canal is limited, i.e. parallel vent can not be used, y-vent will be selected. If Y-type vent is selected, it should be made as close to the inner ear canal as possible when making eardrum.

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Jinghao hearing aid reminder: hearing aid wearing requires professional “matching”, so it is very important to choose a professional hearing aid matching center and a hearing aid tester! If you have any hearing problems, you can call Jinghao for consultation, or come to the matching center for experience. Hearing aid free consultation Tel.: + 86-18566295705

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