Assertion: stent | /r/MadeOf | bare metal
Facets:
value: originally
type: TEMPORAL
Source sentences:
text: Originally stents were made of bare metal and although these devices prevented the artery from collapsing, they only modestly decreased the risk of the artery re-narrowing (restonosis) and around 25% of people treated with a bare metal stent for coronary artery disease, experienced restonosis within just six months.
text: The stents are made of bare metal or have a thin coating of silicone, nylon, or polyurethane.