In the last years, so much is said in reference to bioethical matters. The term "bioethics", is widely used. However few know that its role is not restricted in the formulation of engrossment in reference with ethical problems, which arise by the application of modern medical technology. For half a century, bioethics constitutes a special scientific field with its own epistemology. The knowledge of the history of this new field contributes greatly to the deeper approach of the bioethical matters.