Patent ID: 8317499

Claim:
A pulsatile flow peristaltic pump comprising: a first occluding roller having a first occluding roller axis and a plurality of equally spaced apart radial protrusions defining an outer diameter thereof, a first round pumping roller having a first pumping roller axis and an outer diameter being substantially the same as the outer diameter of the first occluding roller, a rotor having a center and a periphery, said rotor rotatably supporting said first occluding roller at the first occluding roller axis, said rotor further rotatably supporting said first pumping roller as the first pumping roller axis, said occluding roller axis and said pumping roller axis being evenly spaced along the periphery of the rotor at the same distance from the center thereof, a housing with a central axis and a radial raceway along a segment with an angle being about equal to 360 degrees divided by a total number of pumping and occluding rollers of said pump, said housing rotatably supporting said rotor such that the center of the rotor is at the central axis of the housing, and an elastic tubing placed along the raceway between the rotor and the housing, said tubing having an inlet and an outlet, whereby upon rotation of said rotor said pump producing a forward flow from the inlet to the outlet when said pumping roller is engaged with said tubing to progressively squeeze thereof along said raceway, said pump preventing backflow from said outlet to said inlet without producing forward flow when said occluding roller is engaged with said tubing to progressively occlude thereof by its radial protrusions along said raceway, said tubing recovering at least partially to an uncompressed shape between adjacent protrusions of said occluding roller.