You said this is not your first time into the hospital and that you knew they would search your belongings, so you probably knew this item would probably not be allowed. Sorry it ended up being confiscated, but as you know, they are very particular about what they allow in. I always err on the side of caution with what I take to the hospital because they generally only accept basic clothing (with lots of restrictions on ties and belts and shoelaces, etc.), a few toiletries (all alcohol-based product are never allowed), and perhaps some books. Other than that, pretty much all else should stay home.