Apparatus for simultaneous aspiration and dispensation of fluids

Details Apparatus for simultaneous aspiration and dispensation of fluids Apparatus for simultaneous aspiration and dispensation of fluids

1997-03-27

1998-10-06

Raevis, Robert

Measuring and testing

Sampler, sample handling, etc.

Capture device

417535, F04B 3910

Patent

active

058179550

ABSTRACT:
The apparatus for simultaneous aspiration and dispensation of fluids is in the form of a syringe with two chambers located end to end along the length of the syringe. Each syringe chamber includes a port. A piston inside the syringe includes a median section that is movable in both of the syringe chambers, a first end section movable only in one of the syringe chambers, and a second end section movable only in the other syringe chamber. Both end sections of the piston are of either less diameter than the median section of the piston or of greater diameter than the median section of the piston. When the piston is moved in a first direction, an aspiration or suction force is developed at one of the chamber ports and a dispensation pressure force is developed at the other chamber port. Reverse movement of the piston causes the opposite effect at the respective chamber ports. A compression seal is provided at the median section of the piston and at opposite non-adjacent end portions of the syringe chambers. The syringe housing can be formed in two separable sections to permit access to the compression seal at the median portion of the piston. Tandem compression seals can also be provided at the median section of the piston.

REFERENCES:
patent: 281695 (1883-07-01), Holcombe
patent: 3043497 (1962-07-01), Knobloch et al.
patent: 3238889 (1966-03-01), Huber et al.

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