A vascular access graft (1) comprises an elongate conduit (2) having proximal and distalends (3, 4). At least a portion of the elongate conduit (2) has a self-sealing property suchthat the portion remains impermeable after puncturing by a dialysis needle. The vascularaccess graft (1) also comprises a helical fin (6) projecting inwardly from the inner surface(5) of the elongate conduit (2) and extending parallel to the axis of the elongate conduit(2).
