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I get stupid questions about the stuff I carry. Usually it's my knife. When someone asks me why I carry a knife, I tell them, "to cut things with." For my flashlight, "so I can see when it's dark." No one's ever asked about my holster clips, but if they did I'd probably say something like, "it's a clip," and if they ask what for, "for clipping things to my belt." (What things? Whatever I want.) If you're feeling nice, smile and make a joke of it. They'll get the hint that you aren't going to answer but probably won't take offense.

I'm a terrible liar (even for perfectly legitimate purposes such as this), so I don't think I'd get away with trying to pass it off as a medical device or whatever else. If I can answer truthfully in a way that doesn't give away the real answer but puts an end to the questioning, that works best for me.