This makes me think of DNRs or Do Not Resuscitate forms which patients at the end of their lives can sign to make sure the doctors won't try to prolong them.
It's basically the opposite of an informed consent form. It's a form telling the doctor he does not have permission to work.
I always wonder whether the people who sign them ever regret it. I'm not saying they should, but I can't imagine at this point in my life, being that sure I didn't want just a few more hours.
And I always feel sorry for doctors who have to abide by them.
It seems like they can be very frustrated by the way it turns out for some patients. I can understand that, and I sympathize.