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A system, device, and method for mixing liquids involves pumping a first liquid into a first pump chamber of a pumping apparatus through a channel of the pumping apparatus and pumping a second liquid from a second pump chamber of the pumping apparatus into either the channel or the first pump chambe

A system, device, and method for mixing liquids involves pumping a first liquid into a first pump chamber of a pumping apparatus through a channel of the pumping apparatus and pumping a second liquid from a second pump chamber of the pumping apparatus into either the channel or the first pump chamber, preferably while the first liquid is being pumped into the first pump chamber, so that the two liquids are mixed within the pumping apparatus. The second liquid is preferably pumped in a pulsatile mode in which small quantities of the second liquid are pumped at intervals. The quantity and/or the interval can be dynamically adjusted to result in a predetermined concentration of the two liquids. The contents of the first pump chamber are pumped to a receptacle.

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What is claimed is: 1. An apparatus for mixing a first liquid with a second liquid, the apparatus comprising:a pumping assembly having a first pump chamber in valved fluid communication through a channel with a second pump chamber, each pump chamber having a variable volume, the volume depending on

What is claimed is: 1. An apparatus for mixing a first liquid with a second liquid, the apparatus comprising:a pumping assembly having a first pump chamber in valved fluid communication through a channel with a second pump chamber, each pump chamber having a variable volume, the volume depending on the position of a barrier separating the pump chamber from a positive or negative pressure source, the pump chamber being capable of pumping liquid under the influence of the pressure source acting on the barrier;a first pressure transducer to measure the pressure associated with the first pump chamber, and a second pressure transducer to measure the pressure associated with the second pump chamber;a first pump controller operatively coupled to the pumping assembly to control the pumping of a first liquid into the first pump chamber through a first inlet of the pumping assembly; anda second pump controller operatively coupled to the pumping assembly to control the pumping of a quantity of a second liquid into the second pump chamber through a second inlet of the pumping assembly, and into one of the channel and the first pump chamber so as to mix the first liquid and the second liquid within the pumping assembly, whereinthe first and second pump controllers can control pumping at least in part by being configured to receive pressure information from the first and second pressure transducers, and to use the pressure information to determine the volume of liquid pumped through the first pump chamber and the second pump chamber.