Safety syringe needle device with interchangeable and retractabl

Details Safety syringe needle device with interchangeable and retractabl Safety syringe needle device with interchangeable and retractabl

1991-11-29

1993-04-27

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604111, 604195, A61M 500

Patent

active

052058271

ABSTRACT:
The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. The adapter includes vent passages communicating between the central passage through the adapter and the annular space whereby air can be vented from the barrel after receiving fluid within the barrel and prior to injection. Thus, the syringe may be oriented in a vertical position needle end uppermost with the vent passages forming the most superior portion of the barrel interior whereby air may be vented.

REFERENCES:
patent: 4861338 (1989-08-01), Mathiesen et al.
patent: 4929232 (1990-05-01), Sweeney et al.
patent: 4978340 (1990-12-01), Terrill et al.

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