Designing a mouse for quadraplegic

[wolram]

My brother has a friend who is quadraplegic and is at a loss as to how to design a mechanism for him to use his computer efficiently , does any one know of such a device or have an idea as to how to start the design of this [mouse mover] any advice will be welcome as this guy is wrighting a book and needs his computer.

 

[berkeman]

I googled Mouse Pointing Devices For The Disabled, and got a number of good hits. Here's one using an eye camera:

http://www.techpowerup.com/161298/samsung-announces-eyecan-pointing-device-for-disabled.html

Head movement tracker:

http://www.orin.com/access/headmouse/

Tounge-based input:

http://www.sigchi.org/chi97/proceedings/tech-note/cs.htm

You can also look at voice recognition applications like the Dragon system:

http://www.nuance.com/dragon/index.htm

Probably one of the pointing systems plus the Dragon voice recognition system would be a good way to go.