A multiple catheter system is described. In one embodiment a medical catheter system includes a first catheter having an entrance orifice, an exit orifice, a channel connecting the entrance orifice and the exit orifice, and a wall surrounding the channel. In this embodiment the hardness of the wall surrounding...http://www.google.com/patents/US7569046?utm_source=gb-gplus-sharePatent US7569046 - Guide-in-guide catheter system
