The status quo of our country’s hearing aids [the gap with foreign countries]
Chinese hearing aid status
In China, about1.5One hundred million people suffer from hearing loss. The most important means of hearing rehabilitation is wearing a hearing aid. Studies have shown that95% of hearing-impaired patients can improve their hearing by using hearing aids. However, the penetration rate of hearing aids in China is very low. According to incomplete statistics, only3% of patients use hearing aids. This figure is far lower than that of developed countries35% of hearing aid usage. from2000Since the year, my government will be3Month3Japan as the country “love the ears.” We are pleased that the government and many hearing aid manufacturers are actively involved in a large amount of publicity and hearing knowledge aimed at improving citizens’ awareness of hearing protection and rehabilitation and have achieved good results. However, hearing impairment is still a lot, and family members do not understand the importance of hearing rehabilitation.
The main reasons for this phenomenon are:
Only hearing loss can seriously affect verbal communication in order to seek medical or hearing aids. Therefore, in China, there are few patients with mild deafness who need a hearing aid.
2.Most patients are not satisfied with the impact of hearing aids. Without understanding the world of the hearing aid industry, the rapid development of high technology, many patients are still using the concept of the box.
After the residual hearing will deteriorate, quite a few patients are worried about makingUse a hearing aid.
4.There are a lot of patients who still stay in hearing aids to buy a single idea, not knowing that hearing aids should be obtained through professional accessories.
5.The patient believes that the use of hearing aids is a sign of aging and disability.
There are many elderly patients who think that they are older and cannot live longer. Hearing aids are meaningless.
Hearing aid classification
There are many types of hearing aids, the most common of which are divided into five categories: box, ear, ear and bone guiding hearing aids.
Boxed hearing aid
Also known as the body type, it looks earlier and larger, looks like a mini radio, worn on the front, and has a line that transmits the sound output signal to the headphones. More common transistor components are used, so the price is low. Its large size, easy to manufacture high-power output, wide-spectrum range, multi-function adjustment of hearing aids, suitable for finger activities, difficult to use. The thermal noise of the components of such a hearing aid is high, resulting in a higher noise level of the hearing aid. Since boxed hearing aids often rub against clothing, frictional sounds often become disturbing noise.
Ear and back hearing aid
Now the most widely used hearing aid, it has a slim appearance and is hung on the ear by a curved semi-circular hard plastic ear. The outer casing can be used to cover the skin or the color of the hair to hide. The sound is hooked through the ear and passed through the plastic catheter. The sound hole of the ear mold. According to its output power, it is small and the size is large to small.
Ear hearing aid
Strictly speaking, ear canal hearing aids should be divided into ear cavity and ear canal hearing aids. The ear canal can also be divided into a full ear cavity and a half ear cavity. The ear canal also forms a complete hearing tube (CIC) Hearing aids. The ear-shaped hearing aids are more compact in shape and are specially tailored to each person’s ear cavity or ear canal shape. They are used directly in the ear cavity or ear canal and do not require any wires or hoses, which is very delicate. However, the output of the ear hearing aid is not very high, only for patients with mild, moderate, moderate to severe deafness.
Bone conduction hearing aid
Congenital external bone dysplasia (such as external auditory canal atresia, ear malformation) and some patients with external and middle ear diseases (such as suppurative otitis media) are not suitable for wearing air-guided hearing aids.
According to the sound signal processing method, it can be divided into two categories: analog line and digital line. Digital line hearing aids can automatically output compensation based on the user’s hearing loss, providing better speech intelligibility and comfort, and more popular.
Regardless of the form or hearing aid, its basic components are microphones, amplifiers, receivers, potentiometers and batteries. The working principle is to convert the first sound signal into an electric signal, amplify it by an electric signal, and then convert it into an acoustic signal, thereby expanding the sound. In the energy conversion process, the sensor function is implemented as a microphone and a receiver.
Microphone: A microphone is an input sensor that converts sound energy into electrical energy.
Amplifier: The amplifier amplifies the weak voltage of the microphone conversion.
Receiver: The receiver is another sensor opposite the microphone that amplifies the electrical signal into an acoustic signal or mechanical vibration that is transmitted to the ear canal. The receiver for the acoustic signal is an air receiver and the receiver for mechanical vibration is a bone receiver.
Potentiometer (volume control): The potentiometer is used to adjust the current of the amplifier to make the capacitance change. Increase in volume and require more current;The volume is reduced and the current is reduced by the amplifier. Using the trimmer potentiometer in the programmable hearing aid, the accessories can be programmed by the computer to adjust various fine adjustments to make more accurate and accurate adjustments, and more accurately compensate the hearing loss, including: tone control, change The frequency loop of the hearing aid controls the maximum output of the hearing aid; Compression control to control comfort loudness within the sound range; Gain adjustment.
Battery: Provides energy for hearing aids. In general, the greater the gain and output of the hearing aid, the more battery energy is required and the greater the battery capacity. If the battery’s energy is insufficient, it will limit the output sound pressure of the hearing aid, thus affecting the hearing aid effect. In addition to using ordinary5Outside the box-type hearing aids, most hearing aids use zinc-air batteries (button batteries). Common models are:675,13A.312And10A.
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