Where does “stent” come from?

I appreciate the detailed instructions, but I notice there's a mismatch: the chain provided traces "stein" (meaning stone), but the headword requested is "stent" (a medical device). These are different words with different etymologies. Could you clarify which word I should write the etymology for—"stein" or "stent"? If it's "stent," I'll need the correct etymological chain, as the one provided doesn't apply to it.

stent (English): A slender tube inserted into a blood vessel, a...