Hearing aids are sophisticated electro acoustic devices worn behind the ears that are designed to modulate sounds through converting them to electrical signals. There are many kinds of MD hearing aid. Each one has distinct circuitry and power. Among the most popular ones in the market include the body worn, behind the ear, in the ear, in the canal and disposable aids. Each has specific benefits and drawbacks; therefore, users must only pick out the ones that are recommended by their audiologists so as not to put their lives or simply their auditory system completely at stake.
Body worn aids are the first to hearing instruments ever invented. These were designed by an American physicist, Harvey Fletcher - the father of stereophonic sound. These devices have a case and an ear mold which are attached by a wire. Their cases are about the size of playing cards. They come with several electronic controls, a battery and amplifier devices.
The behind the ear or BTE aid is a plastic tube that carries sound in a customized ear mold. It comes in a larger size making it particularly easy to use. This is believed to last pretty longer than any smaller device. It can be integrated with a directional phone. The odd is, this is not easy to hide unless a wearer has a long hair.
An in the ear or ITE, on the other hand, is also custom-made with a shell that perfectly fits in the outer part of the ear. It can house a typical volume control as well as directional microphone. It is easy to manipulate and inserted. This tends to be a bit bulky, though.
In the canal aids are not really noticeable for these are directly inserted into the very opening of the users' ear canal. These devices are priced not as high as ITE aids but are quite large enough for a directional phone. These can be prone to feedback.
Disposable hearing aids come with non-replaceable batteries. Such devices are designed simply for periodic use as well as for critical police investigation where a wearer only uses the device during the operation. People born with hearing disorder are advised to opt for these. However, it is a very good idea to spare at least one or two so as to something to use during emergencies.
Ordinary devices are regulated by the U. S. Food and Drug Administration under the first category of medical devices. Highly industrialized countries typically supply free aids by means of the healthcare programs funded by the government. Also, there are some companies that offer deeply discounted aids but consumers are encouraged not to buy anything immediately if they have still not spoken with their doctors.
People who have severe conditions are required to pay their audiologists a regular visit. Necessary adjustments for the directional microphone as well as control system are required from time to time. Doing these adjustments without the knowledge and skill can only result in the aids' failure.
Choosing an MD hearing aid needs a professional guidance of a doctor. This is a very insensitive device that requires a series of tests and a careful consideration on important factors before a person can get one and use.
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