Drainage tube removal with stents palcement

Well went back to the U of M yesterday for my husband to get his drainage tube out. They went in and placed 2 stents but said they wanted to leave the tube in for 2 more weeks just in case he has any problems for them stirring things up.
They ballooned 3 times prior because of the scar tissue from where he had his resection. They figured they needed to put stents in due to the fact of thats where the cancer is also.
Has anyone had anything like this done and if their stents ever blocked off?
They wanted to get the drainage tube out since he’s had the tube in for 6 months and he’s developed an infection from it once.