Syringe having tamper evidence features

Details Syringe having tamper evidence features Syringe having tamper evidence features

1989-03-30

1990-05-29

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

049292323

ABSTRACT:
A syringe having tamper evidence features includes a barrel having a chamber for retaining fluid, an open proximal end, and a distal end having a passsageway therethrough in fluid communication with the chamber. A needle shield having a longitudinal axis, a distal end and an open proximal end slidably engages the distal end of the barrel covering the passageway. The shield includes an outwardly projecting shield lug having a cam surface. A collar having an annular side wall, an open proximal end and a distal end having an aperture therethrough, is adjacent to the distal end of the barrel with the needle shield projecting distally through the aperture. The apreture is sized so that the proximal end of the needle shield cannot pass therethrough. The collar includes an inwardly projecting lug having a follower surface for contacting the cam surface. The cam surface and the follower surface being configured so that rotational force applied to the needle shield around the longitudinal axis causes the cam surface to contact the follower surface to apply a force to the follower surface. Securement means is provided for releasably holding the collar adjacent to the barrel. The securement means is positioned so that the force applied to the follower surface can disengage the securement means allowing the collar to move and allowing the needle shield to be removed from the barrel.

REFERENCES:
patent: 2371086 (1945-03-01), Watson et al.
patent: 4007740 (1977-02-01), Owen
patent: 4300678 (1981-11-01), Gyure et al.
patent: 4475903 (1984-10-01), Steenhuisen et al.
patent: 4832695 (1989-05-01), Rosenberg et al.

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