A rapidly exchangeable catheter for use in the coronary arteries includes an elongate relatively stiff proximal segment that defines an inflation lumen, an intermediate, shorter segment formed from a more flexible plastic material and having two lumens, and a third, single lumen distal segment....http://www.google.se/patents/US5728067?utm_source=gb-gplus-sharePatent US5728067 - Rapidly exchangeable coronary catheter
