Patent ID: 7927082

Claim:
A pump for providing fluid to a treatment device, comprising at least N number of cylinders, where N is an integer greater than 2; only one piston in each cylinder; the pistons having a motive actuator means driving at a given velocity; the pistons each being attached to a rod driven by the motive actuator means; N number of transmissions each attaching one of the rods to the motive actuator means to drive each rod reciprocatively at a rate of substantially sin m x for x=0 to π during a power stroke of a respective piston, where m is a number greater than one and x is the angular position of a fixed point on a respective transmission; the transmissions driving the pistons in an overlapping phase relationship with a phase offset between the power strokes of the pistons to provide individual flow from each cylinder offset in time to in turn provide a substantially constant fluid flow to the treatment device; the transmissions being coupled to the motive actuator means angularly spaced by 2π/N to provide the phase offset between the power strokes; and wherein the total time of a pump cycle equals the time of the power stroke plus the time of a return stroke of the piston without any substantial dwell time.