a spring or an element made of a shape memory alloy such as nitinol either of which can be returned to their stowed position by means of a wire or by means of a sliding sheath that pushes the element back into its conformal configuration referring now to fig3 a there is shown an application of the device entering an almost blocked lumen 33 in such an application deployment of the steering lobe 32 out of the cover tube 35 surrounding the catheter pushes the catheter 34 towards the side of the lumen enabling it to clean out material 36 from the side of the lumen the steering lobe 32 can either push the catheter against the wall of the vessel 33 as shown in fig3 a or against the bore created by previous passage of the catheter 34 by rotating the catheter device and repeating the procedure several times different circumferential parts of the accumulated material can be sequentially cleared out fig3 b shows an end view of the catheter showing the steering lobe deployed while fig3 c shows the steering lobe showing through the outer sleeve of the catheter device reference is now made to fig3 d and 3e which show one exemplary mechanism by which the steering lobe can be deployed using a tube.