A device for providing access to a treatment site within the body of a patient includes a tubular member having a first, generally elongated configuration for introduction into the body of the patient, and deployable therein to a second configuration. The second configuration includes an axially displaced segment along the distal portion of the tubular member. The tubular member includes a side port oriented along the axially displaced segment, and further includes a lumen communicating with the side port. The lumen and side port are sized for passage therethrough of an interventional device for delivery to the treatment site.