Single-use syringe

Details Single-use syringe Single-use syringe

1989-06-23

1992-01-07

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604218, 604228, 128919, A61M 500

Patent

active

050786865

ABSTRACT:
A single-use syringe has a piston assembly having a plunger (1) with a divergently tapered end portion (4). A resiliently deformable piston (2), with a blind aperture (7) correspondingly tapered so that part of the plunger end portion (4) may fit within, also has a tapered skirt portion (6) adapted to surround a further part of the end portion (4). A locking ring (3) having a tapered aperture to surround said skirt portion is provided to hold the skirt (6) against the plunger end portion (4). When the plunger (1) is depressed within a barrel, the locking ring (3) is delayed by the wall of the barrel while the skirt (6) is pushed inwardly. Once the skirt (6) is unrestrained by the locking ring (3), outward movement of the plunger (1) will cause its end portion (4) to be pulled free from the piston (2). The piston (2) is thus non-retractible to prevent a second drawing in of liquid.

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patent: 4986812 (1991-01-01), Perler
patent: 5000735 (1991-03-01), Whelan

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