Non-reusable syringe and cap therefor

Details Non-reusable syringe and cap therefor Non-reusable syringe and cap therefor

1990-03-05

1991-08-20

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604263, A61M 532

Patent

active

050410997

ABSTRACT:
A non-resuable syringe has inner and outer barrels including a needle connected by hub to the inner barrel and a plunger attached to the outer barrel and received within the inner barrel. A pair of circumferentially adjacent longitudinally extending tracks in the form of teeth are on the outer surface of the inner barrel and a traveler is fixed to the inner surface of the outer barrel, the teeth being such that the traveler may ride on each track in only one direction. The outer barrel may be rotated to move the traveler from an outgoing track for charging the syringe to an incoming track for discharging the syringe, but the teeth on the outgoing track have a greater height than the teeth on the incoming track so that the traveler cannot move back onto the outgoing track. The hub has a flange including an inclined needle facing surface. A protective cap having a skirt at the open end may be disposed on the hub with the skirt removeably positioned on the flange. Another flange on the skirt has the same configuration as the flange on the hub, and after the use of the syringe the cap and hub are pushed together until the flanges lock to preclude removal of the cap. The cap has three feet at the closed end so it may be stood upright while the syringe is being used thereafter permitting insertion of the needle into the cap while eliminating inadvertent pricking. The feet may be resiliently joined to the body of the cap for packing purposes.

REFERENCES:
patent: 3434473 (1969-03-01), Smith
patent: 4735311 (1988-04-01), Lowe et al.
patent: 4826488 (1989-05-01), Nelson et al.

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