Safety syringe

Details Safety syringe Safety syringe

1997-12-22

1999-11-09

McDermott, Corrine

Surgery

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

Treating material introduced into or removed from body...

604110, A61M 532

Patent

active

059804947

ABSTRACT:
A thermoplastic molded housing has a cylindrical bore with axial grooves and inclined camming surfaces extending about the bore surface. A plastic molded vial for receiving injectable fluid in a cavity receives a plunger therein for dispensing the fluid and for displacing the vial. The vial has a ratchet member with fixed ratchet teeth and tabs about its circumference which tabs and teeth form camming surfaces which cooperate with the housing camming surfaces. The tabs are aligned for reciprocating in the housing bore grooves. A ring is secured captured to the vial for rotation about the vial and for limited axial displacement along the vial longitudinal axis. A spring urges the ring and vial to the retracted position. The ring has tabs with camming surfaces for selectively engaging the grooves and the camming surfaces of the ratchet member tabs, ratchet teeth and housing bore camming surfaces to selectively position the vial and the needle attached thereto from a needle retracted position enclosed by the housing bore to an extended needle use position and for retracting the needle and vial to a permanent retracted position in response to depression of the plunger and vial or displacement of the vial alone and to the spring force on the ring.

REFERENCES:
patent: 5057079 (1991-10-01), Tiemann et al.
patent: 5279584 (1994-01-01), Dillard, III et al.
patent: 5312370 (1994-05-01), Talonn et al.
patent: 5415645 (1995-05-01), Friend et al.
patent: 5573513 (1996-11-01), Wozencroft

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