Patent ID: 7361157

Claim:
A syringe-pump driving apparatus for controlling discharge from and drawing-up into a plurality of syringe pumps interconnected in parallel, comprising: a syringe holder for supporting syringes of the plurality of syringe pumps so as to be arranged in parallel; a plunger holder for supporting plungers contained in the syringes so as to be arranged in parallel; three or more drive screws for moving the plunger holder and the syringe holder relative to each other in a straight line in a syringe axial direction; one or a plurality of motors serving as a source of motive power for the drive screws; and, one or more drive belts; wherein the three or more drive screws are connected to the syringe holder or the plunger holder at three or more driving points to transmit motive power to the syringe holder or the plunger holder via the three or more driving points; and, the rotary force of the motor is directly transmitted to one of the drive screws via the belts to other drive screws, so as the rotations of the drive screws are interconnected with one another.