Wow. Well that's a really bad idea Jesper.
The fact of you taking such action will now be in the public domain for ever.
I would never ever choose to trust a surgeon that tried to gag or sue a former patient. The fact that you want to silence them speaks volumes. You get good reputation by having as many as possible previous patients to be fully satisfied and sing your praises by doing a good job. You don't worry about the one or two who are dissatisfied due to bad luck - consumers expect a few negative voices, that is normal and is largely ignored if the positive voices are much more numerous.
You have done your reputation more harm yourself than any MN poster ever did.