an intravascular pump and balloon catheter assembly is shown . the assembly includes a primary catheter having a balloon provided thereon and an intravascular pump provided therein . the pump is adapted to generate a pressure differential between the inlet of the catheter and the outlet . with this structure , fluid is supplied , under pressure , to multiple arteriotomy cannulae provided at the terminal end of the assembly . the cannulae are inserted into blood vessels at appropriate points so that an occlusion or restriction in a blood vessel can be bypassed while still maintaining blood flow throughout the body .