If you need an expensive piece of medical equipment, you can expect your insurance to balk at paying for more than the most basic model, despite the fact that it might not be the best or most durable of equipment. Resign yourself to either making do, or of having to spend some of your own money if you want upgrades.
It's a good idea to brace and secure to the floor stationary equipment that doesn't need to be moved. This makes it less of a hazard to you. This practice is especially important if you live in an area that's prone to geological disturbances like earthquakes.