Disclosed is a minifluidic device including a matrix, an elongated guiding duct embedded at least in part in the matrix, with at least one port to the outside of the matrix, a movable fiber at least partly contained in the guiding duct, and able to undergo within the guiding duct, and at least along some part of the fiber, at least one action selected among a sliding, or a deformation, or a rotation and at least one of the movable fiber or the guiding duct is elastic or is non linear along at least part of its length, or at least part of the matrix is elastic.