Syringe plunger locking assembly

Details Syringe plunger locking assembly Syringe plunger locking assembly

1995-01-30

1997-06-10

Hafer, Robert A.

Surgery

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

Treating material introduced into or removed from body...

604195, A61M 500

Patent

active

056370920

ABSTRACT:
A locking assembly for the plunger of a syringe locks the plunger head inside the body of the syringe when the plunger is depressed at the end of an injection cycle. The inner wall of the syringe body has a constriction which projects inwardly toward the center. The head of the plunger has a catch adapted to cooperate with the constriction and hook the plunger when the plunger is depressed. A flexible shield or seal member is mounted on the plunger head adjacent the catch to prevent trapping of air bubbles under the catch during movement of the plunger while the syringe is being filled with injection fluid and readied for use. The locking assembly is particularly suited for use with a retractable syringe design.

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patent: 5415646 (1995-05-01), Roth

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