Variable sealing pressure plunger rod assembly

Details Variable sealing pressure plunger rod assembly Variable sealing pressure plunger rod assembly

1982-12-20

1985-02-19

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604230, A61M 500

Patent

active

045003106

ABSTRACT:
A variable sealing pressure plunger rod assembly for use with a syringe barrel comprises a plunger rod and a flexible stopper. The plunger rod includes a rigid elongate shaft portion having a circular tapered tip portion at the distal end thereof. The flexible cup-shaped stopper includes an annular side wall and a front wall connected to the side wall. An exterior surface of the side wall is larger in diameter than the syringe barrel inside diameter. The stopper interior includes an inside surface of the front wall and a tapered annular inside wall connected to the side wall and to the inside surface. This tapered annular inside wall and the inside surface define a cavity which has the tapered tip portion received therein. The tapered annular inside wall and the tapered tip portion are inclined at approximately the same angle and adjacent to each other. Cooperating structure for maintaining the positional relationship of the stopper and the plunger rod is also provided.
A method of using a syringe assembly including the variable sealing pressure plunger rod assembly, substantially as described above, is also within the purview of the present invention.

REFERENCES:
patent: 422437 (1890-03-01), Otto
patent: 2895773 (1959-07-01), McConnaughey
patent: 3628523 (1971-12-01), Pirtle, Jr.
patent: 3635218 (1972-01-01), Ericson
patent: 3828778 (1974-08-01), Weinhart
patent: 4074715 (1978-02-01), Geiger
patent: 4180069 (1979-12-01), Walters

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