The present invention relates to a device for transmitting a movement close to a circular translation to a driving element (6) characterized in that it comprises a guide bearing (7) ensuring in one piece the guiding in translation and the freedom of rotation-oscillation of a transmission arm of the movement animated by an eccentric type mechanical assembly (4) placed in a housing or casing (1). This mechanical assembly, protected by a flexible sealing system (8) for the protection of the mechanism located inside the housing or housing and made of an expandable and compressible material, in the form of bellows which connects the housing or housing to transmission arm of the movement (5) while allowing sufficient freedom of movement, allows the transmission arm to move and print to the interchangeable active part connected to its outer free end, the movement close to the circular translation. The movement movement generated by the device in a plane substantially parallel to the surface to be treated allows, through an appropriate and properly oriented active part, to produce the cleaning, massaging and / or polishing action whose applications are multiple, particularly in the medical field and its application to an electric toothbrush.La présente invention concerne un dispositif de transmission d'un mouvement proche d'une translation circulaire à un élément à entraîner (6) caractérisé en ce qu'il comporte un palier de guidage (7) assurant en une seule pièce le guidage en translation et la liberté de rotation-oscillation d'un bras de transmission du mouvement animé par un ensemble mécanique de type excentrique (4) placé dans un carter ou boîtier (1). Cet ensemble mécanique, protégé par un système d'étanchéité souple (8) destiné à la protection du mécanisme situé à l'intérieur du carter ou boîtier et réalisé dans un matériau extensible et compressible, en forme de soufflet qui relie le carter ou boîtier au bras de transmission du mouvement (5) tout en ménageant une libe
