High precision pump for medical and chemical analyzers

Details High precision pump for medical and chemical analyzers High precision pump for medical and chemical analyzers

1998-12-31

2000-07-25

Walberg, Teresa

Pumps

With signal, indicator, or inspection means

417515, F04B 4900

Patent

active

060929952

ABSTRACT:
A high accuracy and high precision pump for fluids, specifically for use in chemical and/or medical analyzers includes a female-thread or nut inside the motor rotor shaft and a male-thread or lead screw mated with the female-thread or nut supported by a bearing that restricts the rotation of the lead screw. The lead screw slides axially, and is connected directly to a plunger or piston which is moved forward or backward by the rotation of the motor rotor. The end of the plunger or piston cylinder chamber includes a common fluid path switch-over valve by which fluid flow may be switched over to a plurality of fluid paths. Movement of pumping components, including pump(s), nozzle(s), valve(s), and tubing, is unified to eliminate volume changes due to changes in fluid tubing flexion.

REFERENCES:
patent: 5253981 (1993-10-01), Yang et al.
patent: 5432098 (1995-07-01), Wilks
patent: 5460055 (1995-10-01), Parker
patent: 5807523 (1998-09-01), Watts et al.
patent: 5820824 (1998-10-01), Tanaka
patent: 5915524 (1999-06-01), Tisone

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