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.