Invisible hearing aids (IICs) are fully in-the-canal hearing aids and are high-end products in hearing aids. Invisible hearing aids defined by international standards are only IIC, and do not include ITE, ITC, CIC, etc. So why are invisible hearing aids so popular with some consumers? After reading the introduction of the advantages and disadvantages of invisible hearing aids, you will understand. This article introduces the advantages and disadvantages of invisible hearing aids, and compares the advantages and disadvantages of behind-the-ear and in-ear.
This is the biggest advantage of invisible hearing aids. Don't many people choose invisible hearing aids because they are "invisible"? In addition, invisible hearing aids have many acoustic advantages due to their appearance and wearing position.
When a person speaks, the sound waves generated by the resonance of the cartilage part of the external auditory canal wall leak out, while the sound waves generated by the bone vibration are less, and the invisible hearing aids are located in the deep part of the ear canal (mainly the external auditory canal bone), which can reduce the occlusion effect.
The pinna boosts mid- and high-frequency sounds and attenuates low-frequency sounds. Pinna For sounds greater than 2000Hz, the gain increases with the increase of frequency, which is the pinna effect. The pinna effect is related to its measurement point. If it is measured at the microphone position of the invisible hearing aid, then this effect is very obvious, and this phenomenon is actually very stable.
The auricle has the function of reflecting and refracting sound waves. When the sound enters the ear canal, the sound pressure increases between 4000 and 5000 Hz, and there is a resonance of 6 to 8 dB. This means that sound in this range is amplified before it enters the microphone. Invisible hearing aids are located deep in the ear canal and do not affect the resonance function of the concha cavity. Therefore, invisible hearing aids have a better compensation effect on high frequencies and can enhance the hearing aid effect in the high frequency range.
Invisible hearing aids are located deep in the ear canal, resulting in a decrease in the volume of the external auditory canal. According to the relationship between pressure and volume, the volume decreases while the pressure increases. Therefore, it is generally believed that the low frequency output of invisible hearing aids is 5dB higher and the high frequency output is 10~17dB higher than that of the same power canal type hearing aids.
Invisible hearing aids can not only meet people's hearing needs, but also are very hidden and not easy to be discovered by others, meeting the psychological needs of users. However, the price of miniature ear canal invisible hearing aids is also relatively expensive compared to other hearing aids. AUSTAR hearing aid experts recommend that people with hearing impairments should choose according to their actual situation.
Each type of hearing aid has its adaptation range, and behind-the-ear hearing aids have the widest adaptation range and can meet the compensation needs of various hearing losses, especially for severe, very severe or some high-frequency steep-drop hearing loss. The best; relatively speaking, the adaptation range of customized invisible hearing aids will be smaller, which can meet the hearing compensation requirements of severe and below. Invisible hearing aids may not work well if they are too small for the user's ear canal.
1. Age, the ear canal of the wearer should be developed. So it is more suitable for teenagers and middle-aged people. Invisible hearing aids are the smallest of the hearing aid types, and may be inconvenient for the elderly to operate when cleaning. Therefore, it is not recommended for the elderly to wear invisible hearing aids.
2. Its shape is much smaller than the volume of traditional CIC hearing aid, and the wearing position of the main body part is within the curve of the second ear canal, so the ear canal cannot be too short or too narrow, and there is no disease in the middle ear.
3. Hearing loss ≤ 85dB (some hearing aids can be expanded to 100dB), and the speech recognition rate is at a medium level, that is, you can roughly understand what others say.
4. Have a correct understanding and expectation of the hearing aid effect.
5. Types of hearing loss. Because sensorineural hearing loss is characterized by a decrease in speech recognition rate (that is, hearing and incomprehensible), the effect of wearing with severe sensorineural hearing loss is not good.