HACKED MEDICAL DEVICES have made scary headlines for years now. Dick Cheney ordered changes to his pacemaker to better protect it from hackers. Johnson & Johnson warned customers about a security bug in one of its insulin pumps last fall. And St. Jude has spent months dealing with the fallout of vulnerabilities in some of the company’s defibrillators, pacemakers, and other medical electronics. You’d think by now medical device companies would have learned something about security reform. Experts warn they haven’t…..