A guidewire or section thereof, that has a core member or the like with a plurality of contiguous tapered segments having taper angles that are configured to produce a linear change in stiffness over a longitudinal portion of the device. The device may also have a core section with a continuously changing...http://www.google.fr/patents/US7455646?utm_source=gb-gplus-shareBrevet US7455646 - Polymer coated guide wire
