An intravascular catheter, comprising a catheter shaft having a proximal end and a distal end, and a guidewire lumen extending through the shaft for receiving a steerable guidewire, wherein the guidewire lumen has a proximal opening at the proximal end of the shaft for insertion of a guidewire into the...http://www.google.ca/patents/US6821287?utm_source=gb-gplus-sharePatent US6821287 - Multi-mode vascular catheter system
