Has anyone heard of a "Rotating Chair Bed" designed for people who can't get in and out of bed by themselves?

Has anyone heard of a "rotating chair bed?" A photo of one can be found here:
http://www.independentliving.co.uk/pictures/rotapro-ed.jpg

Basically it's a hospital bed where the mattress rotates 90 degrees and then folds into a chair. They are meant for people who can't get themselves in and out of bed but can walk on their own. That's my mother. She could avoid assisted living for a while if she could get in and out of bed by herself.

So far, I've only found these things in the UK. Was hoping to find an American distributor.

Thanks for your help!