COMPUTER CONTROLLED POSITIVE DISPLACEMENT PUMP FOR PHYSIOLOGICAL FLOW SIMULATION

摘要

A positive displacement pump, comprising a reservoir for storing fluid; cylinder means for receiving and discharging fluid; piston means within the cylinder means for forcing the fluid into and out of the cylinder means; a four-way valve having an inlet port connected to the reservoir, a pair of bidirectional ports connected to opposite ends of the cylinder means, and an outlet port; and means for receiving a user flow waveform expressed in terms of predetermined flow rate as a function of time and in response moving the piston and configuring the four-way valve to provide fluid flow from the reservoir through the valve into one of the opposite ends of the cylinder means, and from the other one of the opposite ends of the cylinder means through the valve to the outlet port in accordance with the user flow waveform.