From time to time we see questions about how pacemaker leads are held in place. I have seen answers that range from logical to "you have got to be kidding." In the Members Gallery have tried to post a picture of my leads that was made during the implant of a couple of stents. On what I think may be the ventricle lead you can plainly see a corkscrew like tip that I understand was literally screwed into the wall of my heart to keep the lead in place. If the picture is no posted, I'll try again later.
Since that lead had been in place for almost 8 years when this photo was made they may have improvements on how the keep them in place. I don't know about you but in the future when someone says their PM leads were screwed into the wall of their heart I'll be able to visualize how the tip of tht lead probably looks.
As for the three wire loops that look as if they were made from piecof coat hanger pieces, those are the wire loops used to hold my sternum together after bypass surgery in 1982. The surgeon operation report just describes them as loop may of heavy wire. I think the wire is about 1.0 mm in diameter.