Spray nozzle design for a catheter

A medical device including an outer tube, an expandable chamber coupled to the outer tube, and an injection tubular member in fluid communication with an interior of the expandable chamber. The injection tubular member is coupled to a source of fluid and a distal end within the expandable chamber and a fluid nozzle is located in a distalmost end face of the distal end of the injection tubular member. A fluid dispersion unit is coupled to the injection tubular member with a longitudinal axis, the fluid nozzle being within the fluid dispersion unit and configured to direct a flow of fluid into the fluid dispersion unit. The fluid dispersion unit has an opening to direct a flow path of the flow of fluid expelled by the fluid nozzle within the fluid dispersion unit and into an interior surface of the expandable chamber from the opening at the distalmost end face.