| Through evaluating clinical trials with medical equipment in the article, theauthor analysises the violations in the security of the informed consent and thelegal qualitative method of causal relationship, and the principle of hospital’ sresponsibility.The author wants to reveal the contradictions in factacknowledgment and legal qualitative of court for such cases. The author Pointsout the content of informed consent,the necessity and the way. The author wantsto protect informed consent of human subject. |