Pharmaceutical pump dispenser for fluid suspensions and fluid mi

Details Pharmaceutical pump dispenser for fluid suspensions and fluid mi Pharmaceutical pump dispenser for fluid suspensions and fluid mi

1993-04-30

1994-01-18

Weiss, John G.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604131, 222321, 222451, A61M 100, A61M 3700

Patent

active

052795683

ABSTRACT:
A finger actuated pump dispenser employs a first upper hollow vertical cylinder with a first diameter and open upper and lower ends and a second lower hollow vertical cylinder with a second and smaller diameter and a closed lower end with a central opening. The lower end of the first cylinder is joined to an open upper end of the second cylinder. The inner wall of the second cylinder has a horizontal annular recess. A first vertical hollow piston has openings in top and bottom ends and extends slidably above and within the cylinders. The first piston has an enlargement intermediate upper and lower ends peripherally engaging and defining a first unbroken seal with the inner surface of the first cylinder. The first piston has a lower section extending downward from the enlargement to its lower end, the lower section having an outer diameter slightly less than the diameter of the second cylinder. A second vertical piston peripherally engages and defines a second seal with the inner surface of the second cylinder. The second seal is unbroken except when the second piston is aligned with and spaced from the annular recess. A vertical stem is disposed slidably within the first piston and is secured at its lower end to the upper end of the said second piston. The stem is longer than the first piston so that there is always a vertical separation between the lower end of the first piston and the lower end of the stem. A spring extends within the second cylinder between its lower end and the lower end of the second piston.

REFERENCES:
patent: 3399836 (1968-09-01), Pechstein
patent: 3640470 (1972-02-01), Susuki et al.
patent: 4051983 (1977-10-01), Anderson
patent: 4274560 (1981-06-01), Cater
patent: 5038965 (1991-08-01), Cater
patent: 5083682 (1992-01-01), Cater
patent: 5147073 (1992-09-01), Cater
patent: 5217148 (1993-06-01), Cater

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