According to an aspect of some embodiments of the present invention there is provided a device for removal of obstructive material from a vessel comprising:an expandable structure sized for insertion into the vessel； andone or more portion protruding radially from a central longitudinal axis of the expandable structure such that a space between the protrusion and a closest portion of the expandable structure to the portion includes a radial component；wherein the space is sized and shaped to be suitable to accept obstructive material.
