Single use syringe

Details Single use syringe Single use syringe

1992-09-17

1993-07-13

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604218, A61M 500

Patent

active

052268845

ABSTRACT:
A single use syringe which includes a cylindrical barrel having integral finger grips and a first bore, a cylindrical insert having a chamfered bottom end and a second bore, the cylindrical insert being located in the first bore with a space between the chamfered bottom end and the base of the cylindrical barrel sufficient to receive a resilient plunger, a needle or cannula connected to the bottom of the cylindrical barrel, and a cylindrical back stop disposed in the first bore at the top of the barrel. The plunger is releasably connected to a plunger rod by a ball and socket arrangement. The plunger in passing from the first bore to the second bore expands to fill the second bore. The expanded plunger is stopped from retraction and disengaged from the plunger rod by engagement of the plunger with the chamfered bottom end of the cylindrical insert during retraction of the plunger rod. Retraction of the plunger rod is limited by engagement of a transverse cylindrical plate integral with the plunger rod adjacent the plunger with a bottom surface of the cylindrical back stop. A cap is provided to cover the needle, the cap having a funnel-shaped open end, an elongated tube, and a transverse plate integral with the tube to engage the tip of the needle.

REFERENCES:
patent: 4668223 (1987-05-01), Grotenhuis
patent: 4731068 (1988-03-01), Hesse
patent: 4781684 (1988-11-01), Trenner
patent: 4820272 (1989-04-01), Palmer
patent: 4878899 (1989-11-01), Plouff
patent: 4946441 (1990-08-01), Laderoute
patent: 5066279 (1991-11-01), Russell
patent: 5084018 (1992-01-01), Tsao
patent: 5114405 (1992-05-01), Winter

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