Abstract: An apparatus (20) includes one or more longitudinal elements (28a, 28b, 30, 60) configured to pass through a sheath (22) within a body of a subject, and one or more expandable multilayered electrode elements (24) coupled to the longitudinal elements. The electrode elements are configured to advance to a thrombus in the body while collapsed inside the sheath and to expand distally to the sheath following the advance to the thrombus. Each of the electrode elements includes one or more reference electrodes (34) and one or more active electrodes (36) configured to attract the thrombus, following the expansion of the electrode elements, upon application of a voltage between the active electrodes and the reference electrodes. Other embodiments are also described.

Abstract: An apparatus (20) for treating a blockage in a body of a subject includes a tube (22) configured for insertion into the body and shaped to define: a first lumen (24), and a second lumen (26) having a distal opening (28). The apparatus further includes a pair of electrodes configured to apply an electric current to the blockage upon application of a voltage between the electrodes, the pair including an outer electrode (30) wrapped around the tube and an inner electrode (32) configured to pass through the first lumen. Other embodiments are also described.