A steerable guidewire for guiding a catheter includes an elongate hollow shaft having a distal core wire mounted at its distal end. The distal core wire tapers in a distal direction and has a flexible distral tip. The core wire is received within a helical coil mounted to the distal end of the guidewire,...http://www.google.fr/patents/US4886067?utm_source=gb-gplus-shareBrevet US4886067 - Steerable guidewire with soft adjustable tip
