A guidewire comprises a core wire having a coil tip at its distal end. The coil tip includes a helically wound filament having adjacent turns spaced apart by a preselected distance. The guidewire is coated with a polymeric material, typically a hydrophilic polysaccharide, such as hyaluronic acid or chondroitin...http://www.google.fr/patents/US6042876?utm_source=gb-gplus-shareBrevet US6042876 - Guidewire having hydrophilic coating
