I’m encouraged by the success Jeffrey has had with the Osia. Yes, very right that we can’t do direct comparisons of an abutment and an Osia.
The technology of bone conduction and direct bone contact would suggest similar sound transmission to the cochlea. I don’t see any reason that the sound quality from an abutment would be “better” than an Osia’s transducer unless the magnetic transmission path is more limited in frequency range than an abutment system or the vibration motor (transducer) was more limited.
This prompted me to do a little web search. Cochlear does specify their frequency ranges as being different from their respective spec sheets:
BAHA 6 Max: 200 Hz - 9.7 KHz
Osia 2: 400 Hz - 7 KHz (as per IEC 60118-7)
I’m surprised that their frequency ranges are so different. I’m not sure that the frequency ranges are measured the same way though even though they are from same company.
They both have the same 55 dB fitting range though.
The fitting range of 55 dB is a good proxy for power but really is about how much bone conduction hearing loss the system can handle on the same side as the processor. This figure from Cochlear’s “Osia Candidate Selection” does a nice job explaining it.
If you are in the yellow range for bone conduction hearing on your bad ear, the Osia has the power to relay sounds to your bad “ear” by bypassing air conduction.
My bone conduction hearing is much worse than a 65 dB loss (sensorineural loss) so an Osia or abutment system needs to send sound to my good ear.
Again, Cochlear’s “Osia Candidate Selection” highlights an audiogram of a classic SSD candidate for an Osia. (My bone conduction hearing on my bad side isn’t quite this bad.)
Essentially, if the good ear has more than 20dB of loss, the Osia system probably isn’t powerful enough to provide its full benefit.
That is where a more powerful model like the Ponto 5 Super Power (65 dB fitting range) presumably buys you an extra 10 dB of range (hearing loss on the good ear.) The yellow region of the earlier graph should be 10 dB lower.
Maybe the Osia 2’s osseo-integrated transducer has more power that a future Osia 3 or 4 might make use of but I wouldn’t plan on it.
If my hearing in my good ear (really the bone conduction hearing gap on my good side) declines below 20 dB, perhaps due just old age setting in, then I would be left wanting more power.
Result is that I am eagerly awaiting a meeting with the surgeon to find out if I am even a candidate for Osia. Until then, I’ll continue with abutment skin issues and intermittent use of my ancient Ponto.
PS. Sorry for the length of the post - getting a chance to write it down helps me understand the issue better and I would be glad to get corrections if I’m misunderstanding things.