When I was recently treated for a urinary infection, then my pacemaker, I was in hospital for 9 days. The thingy. called a cannula, (pronounced can-you-lar), can only remain in for 3 days, then it must be replaced. I had 3 cannulas, and they were running out of places to put them. One in the crook of each elbow, and one in the inner forearm. The guy on duty wanted to put one in the back of my right hand, but I said it was too likely to get knowed out. My arms were a pretty shade of purple.