A catheter is disclosed which includes an over-the-wire type balloon catheter with a guide wire wherein the catheter includes a polyethylene inner tube and an outer tube having a relatively stiff proximal outer section, a midshaft section of lesser stiffness, and a tapering distal outer section of the...http://www.google.co.uk/patents/US6113579?utm_source=gb-gplus-sharePatent US6113579 - Catheter tip designs and methods for improved stent crossing
