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series of electrical pulses
that are sent down
the electrodes
and stimulate the
remaining auditory nerve
fibers in the cochlea.
So the cochlear implant has the
electrodes, the internal part,
the external part, and
the speech processor
and microphone.
And I have a demonstration
cochlear implant here.
And I'm going to pass it around.
These things are very valuable,
so as demonstration models,
they strip off the electrodes.
So the part I'm
passing around is just
this tube that goes
down here but not
the electrodes
themselves, and I think
it has the internal and
external coil, and obviously not
the microphone or
the speech processor,
so just to give you
an idea of the size.
And I think this one,
the tube comes down,
and it coils around a
little like the electrodes
do as they coil in the cochlea.
Now, this next slide
is pretty important
because it shows the
electrodes coming
into the cochlea in
a cutaway diagram.
And so the electrodes come in
the basal turn of the cochlea.
Remember there's an
area in the bone that
has a little membrane over
it called the round window.
Surgeons can go in there and
make a tear in round window
and put the implant in there.
Or, they can drill
a hole a little bit
apical from the round
window and start
in the base of
the cochlea, which
is the big part of
the cochlea and then
thread just by pushing
the electrode array more
and more apical
into the cochlea.
Now, the cochlea gets pretty
small as it goes very apically.
And the electrodes don't fit
into the apical region so far.