Touch Bionics ProDigits - Most Agile Prosthetic Fingers
From: Popular Science - 12/2010 - page 54

Roboticists have built five-fingered prosthetic arms that can allow wearers
to toss a ball, but the options of people with partial hand amputations are
limited to crude spring-loaded digits. The ProDigits prosthesis offers fully
functional individual fingers and thumbs to the 9200 Americans each year who
lose one or more fingers, and could eventually help the 1700 babies born each
year in the US with partial hand loss. The breakthrough is miniaturization.
Most full hand prosthetics stow the electronics and batteries in the palm,
but because partial amputees still have their palm, Touch Bionics engineers
redesigned everything to fit in the socket. Electrodes in the socket read
muscle impulses to control the fingers. Adaptive programming adds
functionality" Over time patients can graduate from making a fist to typing.
$50,000 - $80,000 

Links:
Touch Bionics
http://www.touchbionics.com/

ProDigits
http://www.touchbionics.com/ProDigits/ProDigits