Patent ID: 6926866

Claim:
A system for aspirating and/or dispensing of liquid samples that comprises a microejection device and a pump, which are connected with one another via tubing, wherein the pump is accomplished as a piston pump comprising a pump cylinder, a pump piston, and a pump drive, and wherein this system comprises a computer that is capable of being loaded with an activatable computer program product for synchronizing operation of the microejection device and the pump, wherein the system carries out the following functions because of the computer program product loaded and activated into the computer to control and synchronize the system: a) to actively define sample volumes until a maximum under-pressure is reached in the tubing, using only the microejection device, which is filled with sample liquid; b) dispense the sample volumes defined in (a) using only the microejection device, which is filled with sample liquid; and c) to track the piston of the pump that conveys liquid about a tracking value that is dependent on the sample volume, which is defined in (a) and is actively dispensed only by the microejection device in (b); wherein said tracking value is maximized at an error volume.