I haven't heard of this before. I know a large part of preserving residual hearing is due to the skill of the surgeon and technique used in inserting the electrodes. Also the type of electrode array used. MEDEL is known for the design of their electrodes to be atraumatic to the cochlea , which means there is an excellent chance of preserving residual hearing.
i didn't really have any residual hearing left anyway so this didn't really matter to me from that standpoint. It did however factor in to my choosing MEDEL as they were really doing their homework in looking at every aspect of the implant and how to make it better for the patient. I'm not saying the other companies don't do that but MEDEL was the first to come out with this type of electrode.
I didn't find the right solution from the internet.