Custom impressions for hearing aides - What types of quality control processes?

al40

Quite Involved in Discussions
#1
Looking for someone who has worked with custom impressions for hearing aides, What types of quality control processes are used in these types of processes?

Example: you take a ear impression for a hearing aide and then make a ear plug what processes can be used to compare the ear plug against the impression other than having a person do a fit check?

Thanks,

Al
 
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R

ralphsulser

#2
I have hearing aids and therefore impressions first. Starting with mixing the solution, adequate fill and cure rate. One problem we ran into was feedback from my right hearing aid due to insufficient length into the ear canal. Had to get a new impression and send back the hearing aid to be reworked.
So I would say OD, angle, and length for sure.
 

MIXOLYDIAN

Starting to get Involved
#3
Just saw this posting and have some info for you. The ear canal impression is a crucial part of the process but creating the shell is just as important. Most companies today use 3D scanning (SLA) to create a "close as possible" replica of the impression. This somewhat minimizes human error but there still is room for error. The manipulation of the scanned image does require some fine tuning due to gaps and imperfections found on the impression. Bottom line: good impression = good scan = good shell.
One of the oldest methods of verification of impression to mold to shell comparison would be using a primitive device called the "caliper". Doesn't hurt!

"Age does not make you wise; the fear of God is the key".
MIX
 
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