Here's a tutorial for a bed caddy that could be converted into a bed rail caddy. What I liked about it is that it is "doubled up" with room for a laptop, newspaper or magazine. If you scroll down past the tutorial to the section "How to Use" you will see what I'm talking about. Maybe you could take bits & pieces from several different patterns & make it to best meet the patients needs. I'm thinking you wouldn't want it too large but when my DH was in the hospital last year, it really would have been nice to have one for that hospital TV/nurse call control. It was always hard to find a good place to put that thing.
http://mypoppet.com.au/makes/2014/02...organiser.html