The invention provides a catheter for insertion into a biological passage
which contains a first flowing fluid, the catheter including a tubular
member having a proximal end and a distal end; a fluid delivery lumen
contained within the tubular member; an inflatable balloon assembly
disposed at the distal end of the tubular member, the balloon assembly
including an inflatable balloon member having an uninflated state and an
inflated state, the balloon assembly including apertures in communication
with the fluid delivery lumen; an inflation lumen in communication with
the balloon member; and a valve contained within the inflatable balloon
assembly. The inflatable balloon is assembly configured such that when
the balloon member is in the inflated state: (i) sections of the balloon
member contact the biological passage defining at least one containment
pocket; (ii) the apertures are disposed in the containment pocket, (iii)
a flow lumen is defined through the balloon member to allow the first
fluid to flow through the balloon member; and (iv) the valve functions to
allow the first flowing fluid to flow through the flow lumen in a
physiologic direction, while blocking backflow of the first fluid through
the flow lumen.