In 2005, when I was collecting information about deep brain stimulation before my surgery, there was no mention of broken leads or lead replacement.
Later, when I was doing research for my book Life With A Battery-Operated Brain, A Patient's Guide to Deep Brain Stimulation Surgery for Parkinson's Disease, I found a few articles that mentioned it along with lead migration and skin erosion on the scalp, but I didn't know anyone who had been through it.
Around the time that I began receiving shocks on my right side, I learned that a couple of people I know have also had leads break in their brains for no apparent reason. Falls had also created the need for lead replacement in one of those same people.
I do not expect any medical device that is in my body working 24/7 for 5 years to be perfect. Nor would I expect a car I drive daily to perform perfectly for that length of time. However, carmakers are supposed to inform owners of issues with their products. I am not claiming that what I have experienced is a recall situation! But as Medtronic and other manufacturers become aware of potential problems, however rare, it would be nice to hear about such issues from them and in a timely manner.