 The measurement of blood pressure during anesthesia is commonly performed by the inflation of a brachial cuff providing only intermittent blood pressure measurements. In some case, it is required to add a continuous invasive monitoring of blood pressure, via the insertion of an arterial catheter. Unfortunately, the related morbidity is not negligible. To limit the consequences of such a gesture, some developments have been done in the past to allow for continuous non-invasive measurements of blood pressure during anesthesia. Unfortunately, most of these devices are subject to important limitations and constraints of use. 