A method for performing an intravascular procedure includes inserting a guide catheter into a blood vessel, and passing a device guide through the guide catheter so that a distal portion of the device guide, having a semi-tubular shape, protrudes from a distal end of the guide catheter into the blood vessel. An intravascular device is inserted through the guide catheter via the distal portion of the device guide to a target site in the blood vessel.
