Multi-lumen medical device

A multi-lumen medical device such as an endoscope or a catheter includes a shaft and a distal tip which are formed as multi-lumen extrusions having a large central working channel and a plurality of surrounding auxiliary lumens. The auxiliary lumens are arranged around the central working channel in a uniform manner so that the flexibility of the extruded member is uniform in a plurality of different directions. Use of the multi-lumen extrusion for the medical device provides a balanced device with a flexibility which is substantially the same in all directions. The medical device may be provided with four way tip deflection by providing four pull wires within four of the auxiliary lumens.