You're going to have to be pretty accurate with a single-shot weapon or at least let the person get up real close and personal to reduce the chance of missing and possible inability to reload easily. I'm less than convinced that it counts as medical equipment though, it seems to be taking a very loose definition of what I'd class as medical equipment i.e. that which is necessary for someones health (and before someone jumps in, I'm not counting the outside risk of a physical assault as a likely impediment to health).
Interesting idea even if it does look rather like an ergonomic corkscrew.