A catheter including an outer conduit and an inner conduit movably disposed therein. The inner conduit includes at least one movable part. The proximal end of the inner conduit is angled piercing the wall of the outer conduit. The catheter includes an inflatable intussusceptable balloon having a proximal margin attached to the distal tip of the outer conduit and a distal margin attached to a portion of the inner conduit extending beyond the distal tip of the outer conduit. The diameter of a first portion of the balloon is larger than the diameter of other portions thereof. The catheter includes means for axially moving the inner conduit within the outer conduit, means for introducing expansion fluid into the balloon and means for permitting axial movement of the inner conduit within the outer conduit, unhindered by the passage of the angled proximal part of the inner conduit through the outer conduit.
