Ear model – introduction of various eardrum performance
We know that the types of ear molds can be divided into plug ear molds and non-blocking ear molds. What kind of categories can be divided into plug ear molds? Which hearing impairment conditions are applicable? The road summarizes for you as follows!
The ear plug ear mold can be divided into standard type, shell type, skeleton type (frame type), half shell type, ear canal type, ear canal lock type, ear wheel ear canal lock type ear mold and the like.
(1) standard ear mold
The standard ear mold retains the complete ear cavity portion, and the outer side of the ear mold is ground into a flat surface on which a metal ring can be attached so that it can be connected to the earphone of the box hearing aid. There is a cavity on the sound hole of the ear mold, which will attenuate the high frequency signal. The sound hole diameter 2mm has no vent holes, and the outer ear is well sealed. Since the original ear mold is mainly used for a box type hearing aid, the ear mold has long been named “standard type” and has been used up to now. With the development of hearing aid technology, the shape of hearing aids has become more and more compact, and the box hearing aids have gradually withdrawn from the market, and the application of standard ear molds has become less and less. Such ear molds are suitable for users with severe hearing loss, high power box hearing aids and auscultation hearing aids.
(2) shell ear mold
It is equivalent to the “standard type” in the ear mold of the ear-back hearing aid. It has a relatively complete ear and ear lock, and has a high degree of firmness and sealing. Since the shell ear mold occupies the entire ear cavity, the outer ear canal has good sealing property, which prevents the occurrence of howling, so the patient sometimes feels uncomfortable in the ear wheel portion. The ear mold can be polished into a thin shell to reduce the weight and increase the aesthetic effect.
The sound hole and the vent hole can be selected in different sizes. This ear mold is suitable for patients with severe to very severe hearing loss.
(3) skeleton (frame) ear mold
Similar to the shell ear mold, but without the central part of the ear, in order to increase the patient’s comfort, the central part of the shell ear mold can be hollowed out, leaving only the edge bone ring and embedded in the ear cavity. In this way, the weight of the ear mold is reduced, and the area where the ear mold is in contact with the auricle is reduced, thereby improving the comfort of wearing the ear mold. This ear mold is suitable for patients with mild, moderate and partial severe hearing loss.
(4) half-shell ear mold
The half-shell ear mold is also called the ear canal shell type ear mold. The ear canal portion of the ear mold is removed, and the ear mold covers only the portion of the ear cavity. The half-shell ear mold is suitable for patients with inflexible fingers and mild to moderate hearing loss, and is generally the majority of elderly patients.
(5) ear canal ear mold
This ear mold retains only the outer ear canal portion. Because it has the least contact area with the outer ear, it is the most comfortable to wear and easy for the patient to wear. However, its robustness and tightness are poor.
(6) ear canal ear mold and ear canal ear mold
With the continuous improvement of the ear mold technology, the ear mold can be improved on the basis of the ear canal ear mold, and the improved ear mold can be further divided into: the ear canal lock ear mold and the ear wheel ear canal lock type ear mold. . The above two improved ear molds enhance the firmness of the ear canal ear mold.