Two-shot molded plunger

Details Two-shot molded plunger Two-shot molded plunger

1996-11-26

1999-05-11

Coggins, Wynn Wood

Surgery

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

Treating material introduced into or removed from body...

A61M5/315

Patent

active

059022760

ABSTRACT:
A syringe plunger is formed by a two-shot molding process. A hard plastic core is formed in a first mold, and the distal portion of the hard plastic core is subsequently overmolded with soft rubber. The result is a fully automated manufacturing process increasing quality and lowering costs, and a unique plunger having a hard plastic core and soft rubber exterior which are molecularly and permanently bonded together.

REFERENCES:
patent: 2333059 (1943-10-01), Tucker
patent: 2337550 (1943-12-01), Crosby
patent: 3178497 (1965-04-01), Moscicki
patent: 3221373 (1965-12-01), Kwan
patent: 3890956 (1975-06-01), Moorehead
patent: 4201209 (1980-05-01), LeVeen et al.
patent: 4214507 (1980-07-01), Hock et al.
patent: 4340067 (1982-07-01), Rattenborg
patent: 4874372 (1989-10-01), McArthur et al.
patent: 5397313 (1995-03-01), Gross

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