The present invention concerns a double-lumen catheter comprising an elongated tubular body (11) having a proximal end and distal end, a divider wall (26) extending along an interior of said tubular body (11) and separating said interior into an intake lumen (22) and a return lumen (24), and the intake lumen (22) and said return lumen (24) each comprising a bevelled opening (1214) sloping toward the divider wall (26) and toward the distal end of the tubular body (11), respectively, the openings (1214) being divided by the divider wall (26), such, that one side of the divider wall (26) faces the intake lumen (22) and the other side of the divider wall (26) faces the return lumen (24). Further, the divider wall (26) at the distal end of the tubular body (11) on at least one of its two sides comprises at least one ridge (1618) extending in the area of the openings (1214) and along a longitudinal portion of the tubular body (11).
