A flow directed device adapted to be guided by a fuid, such as blood, flow within a tubular structure such as a blood vessel is disclosed, said device comprising a proximal end (100), a distal end (101) and an elongated body (102) in between defining a longitudinal axis (103), characterized in that said distal end (101) comprises a ferromagnetic area or structure (300) capable of deflecting the distal end (101) when subjected to an external magnetic field. A system comprising the device, as well as method of use of the device, are also disclosed.