Hypodermic syringe cartridge with non-retractable drive piston

Details Hypodermic syringe cartridge with non-retractable drive piston Hypodermic syringe cartridge with non-retractable drive piston

1984-05-14

1985-01-15

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

A61M 500

Patent

active

044937032

ABSTRACT:
The drive piston of a hypodermic syringe is rendered non-retractable by including on it a resilient disc-like element whose free diameter is slightly larger than the diameter of the glass tubular body of the syringe. The drive piston is inserted into the glass tubular body from the rear end, thereby causing the resilient disc-like element to become dished with its concave side facing rearward. The dished resilient element acts as a continuous pawl since any attempt to retract the drive piston jams the edge of the resilient element against the inside wall of the tubular body.

REFERENCES:
patent: 2753867 (1956-07-01), Goldberg
patent: 3742949 (1973-07-01), Hill
patent: 4233975 (1980-11-01), Yerman
patent: 4367738 (1983-01-01), Legendre et al.

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