A method and apparatus for aspirating and dispensing precise volumes of liquid, e.g. whole blood, comprises an aspiration probe or needle having an internal volume precisely equal to a desired volume to be dispensed, and a computer-controlled shear valve for trapping aspirated liquid inside the probe...http://www.google.es/patents/US6322752?utm_source=gb-gplus-sharePatente US6322752 - Method and apparatus for aspirating and dispensing liquids
Method and apparatus for aspirating and dispensing liquids
