Dilatation balloon catheter with infusion lumen

Claim 1

A dilation catheter comprising (a) a shaft having a proximal end and a distal end, the shaft defining an inflation lumen for allowing an inflation fluid to pass therethrough, a guidewire lumen for allowing a guidewire to pass therethrough and an infusion lumen for allowing a contrast enhancing medium fluid to pass therethrough; (b) a balloon having a proximal end and a distal end, the balloon defining a balloon interior and being mounted adjacent the distal end of the shaft; (c) a first inflation port at the proximal end of the shaft, the first inflation port being in communication with the inflation lumen; (d) a second inflation port in communication with the inflation lumen and the balloon interior; (e) a first guidewire port spaced proximally from the proximal end of the balloon in communication with the guidewire lumen; (f) a second guidewire port at the distal end of the shaft in communication with the guidewire lumen; (g) a first infusion port at the proximal end of the shaft for receiving the contrast enhancing medium fluid, the first infusion port being in communication with the infusion lumen; and (h) a second infusion port spaced distally from the proximal end of the shaft and spaced proximally from the first guidewire port for allowing the contrast enhancing medium fluid to exit the dilation catheter while the guidewire is disposed in the guidewire lumen, the second infusion port being in communication with the infusion lumen and wherein the first guidewire port is located on the side of the shaft opposite the second infusion port so that the guidewire does not interfere with the infusion of the contrast enhancing medium fluid.