Disposable syringe with retractable cannula

Details Disposable syringe with retractable cannula Disposable syringe with retractable cannula

1986-04-14

1987-09-08

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

128763, A61M 532

Patent

active

046921567

ABSTRACT:
An improved hypodermic syringe having a cannula retractable within the syringe barrel after injection. A piston in reciprocable sealing engagement with the interior of the syringe barrel includes an engaging structure at its forward end which is attachable to the cannula base. After administration of the fluid contained within the syringe chamber, the piston engages the cannula base, preferably by "snapping" on to the rearward end of the cannula, and retracts the cannula within the barrel. The barrel may additionally be designed so as to prevent complete removal of the piston. In an alternative embodiment, a cannula retracting mechanism is provided in a hypodermic syringe assembly for drawing blood.

REFERENCES:
patent: 3930492 (1976-01-01), Hatsuno et al.

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