Make sure you don't earn or have enough money the someone would find profitability in hacking your medical device. Contact your lawyer right away and start a class action suit against the medical device manufacturer for making if vulnerable. No wait then you might have money worth extorting. Better still contact the insurance companies and tell them they will have to pay out if someone dies, they have the money and will to force the device manufacturers to fix the loop hole. No wait they will just put a no pay for hacker clause in the policy.
I guess there is no solutions unless we can change the human factor. As long as humans are basically greedy (and we all are to some degree) we will see the grass greener on the other side and will try to get there by whatever means possible. In the case of hackers that means at the expense of someone else, they see it easier to steal a buck than earn it. Perhaps the buck is the fundamental problem.