Syringe assembly

Details Syringe assembly Syringe assembly

1988-08-15

1990-03-13

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604110, 604192, A61M 532

Patent

active

049080237

ABSTRACT:
A syringe assembly having a hollow barrel, a plunger and a hypodermic needle and is discardable after a single use. The hypodermic needle has a first end fixedly secured to and in communication with the barrel and has a free end for the discharge of medication therefrom upon the downward movement of the plunger within the barrel. The barrel is covered by a two-part hollow cylindrical sheath having a first part extending, when in a first position, along the barrel a distance allowing at least the partial exposure of the hypodermic needle and having a second part extending, when in the first position, a distance beyond the free end of the needle to substantially cover the same. The second part of the sheath has one end coupled to the first part by a breakable joint which can be broken so that the second part may be discarded prior to use. The needle includes a ratchet system to allow the first part of the sheath to be extended over the hypodermic needle after the syringe has been used which ratchet system includes a locking pawl to permanently prevent movement of the sheath upwardly along the syringe barrel.

REFERENCES:
patent: 3828775 (1974-08-01), Armel
patent: 4573976 (1986-03-01), Sampson et al.
patent: 4631057 (1986-12-01), Mitchell
patent: 4655751 (1987-04-01), Harbaugh
patent: 4666435 (1987-05-01), Braginetz
patent: 4693708 (1987-09-01), Wander et al.
patent: 4710179 (1987-12-01), Haber et al.
patent: 4743233 (1988-05-01), Schneider
patent: 4747837 (1988-05-01), Hauck
patent: 4752290 (1988-06-01), Schramm
patent: 4801295 (1989-01-01), Spencer
patent: 4826491 (1989-05-01), Schramm
patent: 4840185 (1989-06-01), Hernandez

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