These are similar to what we used in the hospital. The ones our supplier and other hospitals use have no covers. We can't get enough to dispose of them after every use, so they would have to be multiple use. I don't see how you could keep it even relatively clean.
I put this as a 4 instead of 5 only because the ones we got in the hospital are the blue ones that come apart after the switch. The green ones don't do that. The blue ones are only available in large quantities, though.