Scaffold materials expand when heated and contract when cooled. The copper wire bracket is used for display screen indoors, while the copper wire bracket is used outdoors because the bracket material will expand when heated and contract when cooled. The service life of products using copper brackets can reach more than 5 years. Stent is a kind of reticular medical device made of nickel-titanium metal, which is used to treat atherosclerotic stenosis or arterial dissection.