Patent ID: 7182228
Filing Date: 2007-02-27
Classification: B01L,G01N

Abstract:
1. A cartridge for a fluid comprising: a cylindrical tank having an opening that admits and discharges fluid relative to the tank, said tank having a first longitudinal section and a second longitudinal section adjoining said first longitudinal section; a piston movable in a longitudinal direction toward and away from said opening to pump a fluid through the opening into or out of the tank; a connection element that engages an actuator for moving said piston in said longitudinal direction, said connection element that mechanically interacts with said actuator to produce a positive fit therewith, said connection element being movable back and forth between said first and second longitudinal sections of said tank so as to be alternatingly disposed in and engaging said first longitudinal section and disposed in and engaging said second longitudinal section; and said second longitudinal section having a shape that forces said connection element to interact with said actuator to produce said positive fit when said connection element is in said second longitudinal section and said first longitudinal section having a shape that automatically releases said positive fit when said connection element is in said first longitudinal section.