Disposable syringe for once-only use

Details Disposable syringe for once-only use Disposable syringe for once-only use

1991-01-15

1992-06-30

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604187, 604218, A61M 500

Patent

active

051258994

ABSTRACT:
The invention provides a disposable syringe which can be used once only.
The syringe comprises a shaft having a shaped appendix to which a plunger slidable within the syringe cylinder is sealingly connected. At that end at which the hypodermic needle is mounted the cylinder comprises a hole into which a hollow element having a shaped element integral therewith and projecting into the cylinder is inserted and locked. This shaped element becomes securely coupled to a portion shaped complementary to it provided at the adjacent free end of the plunger carried by the shaft to prevent the re-use of the syringe after the shaft has been lowered to firmly engage the shaped portion with the shaped element projecting from the cylinder since withdrawal of the shaft would cause disengagement of the plunger from the shaped appendix of the shaft.

REFERENCES:
patent: 2880725 (1959-04-01), Kendall
patent: 3667657 (1972-06-01), Chiquiar-Arias
patent: 3934586 (1976-01-01), Easton et al.
patent: 3951146 (1976-04-01), Chiquiar-Arias
patent: 3998224 (1976-12-01), Chiquiar-Arias
patent: 4233975 (1980-11-01), Yerman
patent: 4367738 (1983-01-01), Legendre et al.
patent: 4710170 (1987-12-01), Haber
patent: 4775364 (1988-10-01), Alles
patent: 4804370 (1988-12-01), Haber
patent: 4813936 (1989-03-01), Schroeder
patent: 4838870 (1989-06-01), Haber et al.

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