Retractable needle syringe

Details Retractable needle syringe Retractable needle syringe

1994-09-28

1996-07-09

Green, Randall L.

Surgery

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

Treating material introduced into or removed from body...

604195, A61M 500

Patent

active

055339700

ABSTRACT:
A retractable needle syringe includes a barrel having an inside surface defining a chamber, an open proximal end and a distal end. An elongate plunger is slidably positioned in fluid-tight engagement with the inside surface of the barrel. The plunger includes a distal end, a proximal end and a radially directed projection on its distal end. A movable carrier is positioned in fluid-tight engagement with the inside surface of the barrel. The carrier includes an outside surface, a distal end, a proximal end, and a passageway therethrough in fluid communication with the chamber. The proximal end of the carrier includes an open-ended groove which is sized and shaped to receive the plunger projection. The groove includes an axial portion and a circumferential portion. The plunger is movable axially so that the plunger projection can enter and exit the axial portion of the groove. Rotation of the plunger with respect to the carrier causes the projection to enter the circumferential portion of the groove, containing said projection so that said plunger rod can apply axially directed force and rotationally directed force to the carrier. A needle cannula projects outwardly from the distal end of the carrier. Control structure is provided to prevent movement of the carrier with respect to the barrel during normal use of the syringe and for allowing the carrier to be moved proximally into the chamber of the barrel through forces applied to the plunger.

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