Syringe apparatus having improved plunger

Details Syringe apparatus having improved plunger Syringe apparatus having improved plunger

1989-06-23

1991-01-22

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

A61M 5315

Patent

active

049868209

ABSTRACT:
An improved syringe apparatus in which the plunger tip is fabricated as a unitary part of the plunger. The plunger tip is provided with two contact members in contact with the cylindrical bore wall of the syringe barrel. The first contact member is provided by a circular rim which is bowl shaped and which projects forwardly at the end of the plunger. The second contact member is provided by a circular ring located slightly behind the first sealing member. The entire plunger, including both contact members, are preferably fabricated as a unitary structure from, for example, polypropylene or other material which is relatively resistant to degradation due to chemicals stored over prolonged periods of time in the syringe barrel.

REFERENCES:
patent: 2575425 (1951-11-01), Nelson
patent: 2812763 (1957-11-01), Feguson
patent: 3026872 (1962-03-01), Prater, Jr.
patent: 3277894 (1966-10-01), Alexander
patent: 3656480 (1972-04-01), Rubricius
patent: 3738539 (1973-06-01), Belch
patent: 3766918 (1973-10-01), Kessel
patent: 4201209 (1980-05-01), LeVeen
patent: 4467065 (1984-08-01), Williams et al.
patent: 4708270 (1987-11-01), Ruesch

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