Bioethics is a field of applied philosophy where Kantian moral philosophy is very often evoked under the label of ‘deontologism’. Core concepts (categorical imperative, duty, maxims, etc.) are of course regularly used and discussed but in a rather conservative form and context, as if Kantian practical philosophy had to sustain only prudential normative discourses. Another look on secondary or lateral questions let us perceive some less current Kantian echoes in bioethics, opening the way to a new reading of rational norms in the situation of responsibility and choice in radical uncertainty.