Non-reusable hypodermic syringe

Details Non-reusable hypodermic syringe Non-reusable hypodermic syringe

1987-09-02

1989-04-11

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604218, 604220, A61M 500

Patent

active

048202720

ABSTRACT:
A non-reusable hypodermic syringe which comprises a cylinder and a plunger, spaced from the lower end portion of the cylinder there is provided a first half of a one-directional retention means. The plunger comprises a shaft and a piston attached to an end of the shaft, and the second half of the retention means is provided on the shaft close to the connection of the piston. The retention means allows the full insertion of the plunger in the cylinder but impedes its withdrawal. Preferably, a projection ring is provided just above the retention means on the inner cylinder wall that indicates to the user that further movement to insert the plunger will positively engage the retention means. This projection ring acts as a tactile warning to the user to prevent "accidental" engagement of the retention means when filling the syringe. In a preferable embodiment, the upper portion of the cylinder is provided with a further first half of the retention means which prevents any removal of the plunger when inserted in the cylinder.

REFERENCES:
patent: 4367738 (1983-01-01), Legendre et al.
patent: 4391272 (1983-07-01), Stampfli
patent: 4650468 (1987-03-01), Jennings, Jr.

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