Variable stop syringe

摘要

A variable stop syringe for automatically selecting, aspirating and dispensing one of a desired plurality of fluid volumes. The variable syringe includes a plurality of stops in an array each of which defines a particular fluid volume. The array selectively is moved to position the desired stop in the fully aspirated position of the syringe plunger. The stop positions are coded and automatically may be read to select the desired syringe stop for the particular volume of fluid desired to be aspirated and dispensed. The completely dispensed and the fully aspirated positions of the plunger, as well as the speed of the plunger operation, may be monitored to ensure that the plunger is operating properly.