I had redirected the viewers to the link posted in my previous post as it gives a good eagle's eye view of the medical device security scene from all angles. My research is focused towards medical device security as well, so many of my posts would be with respect to technical papers and journals.
Below I provide a few more links that give a general aspect of medical device security and its perspective from the industry, people and mainly the FDA!!

• "FDA is a step backward in medical device security "
• "Delloite's take on medical device security"
• "Why should medical device security be top priority"
• "The Archimedes Center for Medical Device Security"

The icing on the cake link: "Who cares about medical device security?"