Disposable safety syringe having a retractable needle cannula an

Details Disposable safety syringe having a retractable needle cannula an Disposable safety syringe having a retractable needle cannula an

1988-08-15

1990-03-13

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604110, A61M 532

Patent

active

049080229

ABSTRACT:
A disposable safety syringe comprising a cylinder which is prefilled with fluid medication, a double ended hypodermic needle cannula, and a cannula lock by which the needle cannula is supported in an axially extended position so that an injection of the fluid medication may be administered. The cannula lock includes a clamp having a pair of oppositely disposed jaws between which the cannula is releasably retained. The fluid medication is carried within the syringe cylinder between piston and plug members, each of which members having respective suction heads which are arranged in spaced, face-to-face alignment with one another. The piston member is advanceable axially and distally through the syringe cylinder whereby to expulse the medication from the cylinder and move the suction head of the piston member into air-tight sealing engagement with the suction head of the plug member at the distal end of the cylinder. The needle cannula penetrates the sealed piston and plug members, such that a retraction of the piston member axially and proximally through the cylinder causes a corresponding withdrawal and relocation of the cannula from the jaws of the cannula lock to the interior of the cylinder, where said cannula is completely surrounded and shielded to prevent a reuse of the cannula and an accidental needle stick.

REFERENCES:
patent: 3923058 (1975-12-01), Weingarten
patent: 3946732 (1976-03-01), Hurscham
patent: 4067333 (1978-01-01), Reinhardt et al.
patent: 4424057 (1984-01-01), House

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