A first medical instrument includes a flexible catheter and a medical guidewire extendable beyond a distal end of the catheter. The catheter is adapted to slidably receive a rail-coupling portion of an adjunct medical device. The medical guidewire has first and second segments, wherein the bending moment...http://www.google.ca/patents/US20050256374?utm_source=gb-gplus-sharePatent US20050256374 - Medical instrument having a guidewire and an add-to catheter
