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Nowadays, more and more surgical interventions are carried out in MinimallyInvasive Surgery, to make the post-operative constraints less painful for thepatient. Actually, new surgical tools or medical products are designed afterinformal discussions between surgeons and designers. The user requirementsdocuments are the main document used by the mechanical designers to design andimprove the product. Medical terms, often used by surgeons and employed toexplain their needs, don't allow for an instantaneous understanding bydesigners. Unfortunately, this relation causes a dysfunction in the definitioncycle of the product. Our aim is to work on the design process, its assistancethanks to methods and tools and on its organisation for better understandingsand more complementarities between surgeons and designers. We propose on thisarticle a design method already tested in the informatics domain: User CentredDesign which takes the user into account more effectively in the processdesign. We already propose a scenario oriented design method centred on theuser and represented as a scenario (Scenario-Based Design). We start in thisarticle by clarifying these concepts before detailing their implementation forthe design of a new surgical tool.

Mise en place de sc\'enarios pour la conception d'outils en Chirurgie Minimalement Invasive