I don't know all the particulars to Senator Sanders' new need for a stent, but, he will be back on the campaign trail soon.
Stent procedures are fairly common and have become a relatively minor procedure. It isn't like having a tooth filled for a cavity, but, it isn't major surgery.
I wish him well and look forward to him returning to his campaign for president within a week or so. He is probably due some rest right now. Honestly, he is so dedicated to this country it takes the need for a stent in order to stop him to get some rest. That is quite a statement.