The term 'artery-opening tube' is a reference to a stent, which is a medical device used to open blocked arteries. A stent is a small, metal tube that is inserted into the artery and expanded to keep it open. Stents are commonly used to treat coronary artery disease, peripheral artery disease, and other conditions that cause narrowing of the arteries. Stents can also be used to treat aneurysms and other vascular diseases.