Composite hypodermic syringe piston

Details Composite hypodermic syringe piston Composite hypodermic syringe piston

1997-11-04

1999-12-21

McDermott, Corrine

Surgery

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

Treating material introduced into or removed from body...

604218, A61M 5315

Patent

active

060043008

ABSTRACT:
A process for forming a composite piston of at least two materials, preferably a rigid material and an elastic material, the materials being chemically fused in a modular mold, and the plunger formed thereby. The process comprising injection molding one of the rigid material and elastic material in a mold to form a first piston part; forming a cavity in the mold adjacent the first piston part; injection molding the other of the rigid material and plastic material in the cavity to form a second piston part in contact with the first piston part; and removing the piston having a rigid part and an elastic part from said mold. Upon opening of the mold, complete, finished pistons are presented. The material for forming the elastic part preferably includes a lubricant. The process reduces assembly costs, quality control concerns, and contamination due to human contact.

REFERENCES:
patent: 4385025 (1983-05-01), Salerno et al.
patent: 4997423 (1991-03-01), Okuda et al.
patent: 5411488 (1995-05-01), Pagay et al.
patent: 5578011 (1996-11-01), Shaw
patent: 5735825 (1998-04-01), Stevens et al.
patent: 5769822 (1998-06-01), McGary et al.

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