Multi-lumen catheters are intended for advancement through the accessory channel on endoscope into a body passage into the gastrointestinal system. The catheters have two or more independent lumens extending continuously to ports at the distal tip for injection of a contrast medium simultaneously...http://www.google.com.au/patents/US5843028?utm_source=gb-gplus-sharePatent US5843028 - Multi-lumen endoscopic catheter
