The present invention is directed to a steerable guidewire. More specifically, the invention is directed to a guidewire which comprises flexible tubing having proximal and distal ends and inner and outer surfaces, a helically wound flexible spring coil having proximal and distal ends, the proximal end...http://www.google.es/patents/US4813434?utm_source=gb-gplus-sharePatente US4813434 - Steerable guidewire with deflectable tip
