This is an impression of an ear canal, taken by a Registered Hearing Aid Dispenser.
It was taken with the use of an impression gun, which guarantees an exact mix of the two component silicones and allows the Dispenser to use a safer very-low-viscosity impression material. The black bit is an OtoBloc. This is inserted first in order to prevent the impression material touching the ear drum. It can also provide useful information as to the direction of the last part of the ear canal. This impression was taken f or a Phonak Virto 90 Nano IIC. It was necessary to insert the OtoBloc right up to the end of the ear canal, just a fraction away from the ear drum.
This type of impression-taking is only carried out by very experienced and skilled Dispensers. There is little or no risk of discomfort, pain or injury if the correct impression-taking procedure is followed.
This impression shows excellent definition 5mm past the second bend. It is considered that if the tip of a hearing aid is lodged in this area, then there will be less chance of the rather unpleasant side-effect OCCLUSION. Also, if the microphones on the face- plate are as far in as possible, there will be a far more natural sound and an improved directionality and sound-to-noise ratio.
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