The nature of the behavior must be good and the intent of the behavior must be a good outcome. Bad outcomes are predictable but must not be the intent.
(1) The doctrine of patient consent. This doctrine holds that the core of deterring violation of the law is the consent of the patient and his relatives, and that the patient enjoys the right of self-determination, and that his informed consent to a certain degree of invasion of his body by a physician taking normal therapeutic action is the result of the exercise of his right of self-determination.
(2) medical purpose. According to this doctrine, medical treatment is aimed at improving human health, maintaining normal health, preventing disease, alleviating pain and injury, and restoring health, and is "socially justified".
Medical behavior is invasive:
Although medical behavior is to save the patient's life and health for the purpose, but the examination methods, means, treatment methods and the use of drugs, not only to the patient's body invasive and damaging, but also to the tissues and organs of a certain or even obvious invasive, easy to lead to the results of the human body caused by the damage.
This seems to violate the patient's personal rights, but in fact belongs to the normal medical behavior. The reason for this is that proper medical behavior has the nature of illegal obstruction.