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hearing aid

 for totally deaf - no need for ear
 
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Our skin, say on forearm can usually feel vibrations of a speaker when it touches it ; We can replace earphone part of hearing aid by flat speakers which can make good contact with skin. Thus, to "hear" or feel a sound, deaf person puts the speaker on any part of his/her body and feels vibrations instead of putting earphone in ear; (earphne of a hearing aid is replaced by a speaker.)

From those vibrations, a deaf person can tell if there is a sound present or not, or how loud it is. This could be better than nothing. And this could be used to "hear" morse code.

—VJW, Nov 30 2010

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       Cochlear implants tend to work well in cases of profound deafness (i.e. bad enough that conventional hearing aids are ineffective), they are very expensive though.
—Spacecoyote, Nov 30 2010
   

       Agreed. I think cost is the major advantage here; plus simplicity of "installation".
—VJW, Dec 06 2010
   

       Jo Brand on Van Goch: It was a bit more than that. I mean he was, like, seriously mentally ill, rather than, "not a happy bunny."
—po, Dec 06 2010
   


 

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