Device for projectile dispensing of small volume liquid samples

Details Device for projectile dispensing of small volume liquid samples Device for projectile dispensing of small volume liquid samples

1997-11-12

1999-10-12

Kashnikow, Andres

Dispensing

With discharge assistant

Container with follower

222135, 222149, 222389, 222571, B67D 542, B67D 552, B65D 572

Patent

active

059643811

ABSTRACT:
A piston is disposed inside a tube having an inner cross sectional size and shape uniform along its length. The tube has an open end. The piston is free to move linearly inside the tube and preferably may move out of the tube through the open end. If the tube is cylindrical, for example, it has a constant inner diameter. The open end of the tube is neither tapered or flaring. Liquid samples are aspirated into the device by pulling the piston back. The sample is then ejected by accelerating the piston to a minimum velocity to force the liquid sample out of the open end of the tube. The velocity of the sample is sufficient to render negligible the effects of surface tension forces. The volume of the liquid sample dispensed is determined by the inner diameter of the tube and the piston displacement. Accurate positioning of the piston provides samples of accurate volumes. A specific embodiment of the present invention uses a tube with an inner diameter of 0.5 mm, resulting in a volume displacement of 1.9 microliters per centimeter of piston travel.

REFERENCES:
patent: 3851798 (1974-12-01), Miller
patent: 3934585 (1976-01-01), Maurice
patent: 4363429 (1982-12-01), Schindler
patent: 5252037 (1993-10-01), Carlson
patent: 5525302 (1996-06-01), Astle

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