Hypodermic syringe with needle retraction feature

Details Hypodermic syringe with needle retraction feature Hypodermic syringe with needle retraction feature

1993-02-01

1994-08-09

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604110, A61M 532, A61M 500

Patent

active

053361989

ABSTRACT:
An improved hypodermic syringe includes a needle retraction feature permitting the needle to be fully retracted into the cylindrical cavity of the syringe barrel following the injection of medicine into a patient. The needle is held on the distal end of the barrel by means of an attachment hub, which includes an internal abutment surface to prevent outward movement of the needle. Inward movement of the needle is prevented by an expandable restriction of a distal barrel opening, extending between the cylindrical cavity and the distal end of the barrel. The needle is part of a subassembly including a flange held between this internal abutment surface and this expandable restriction. The distal end of the plunger is fitted with a needle extractor, which moves into the distal barrel opening as the plunger is pushed fully into the cylindrical cavity. The needle extractor grips the proximal end of the needle subassembly and expands the expandable restriction so that the needle subassembly, with its flange, is pulled into the cylindrical cavity as the plunger is pulled outward. The needle extractor may be elastically mounted on the plunger, pointing at an acute angle with the axis of the cylindrical cavity, so that the needle is rotated to point toward the side of the barrel as it is pulled fully within the cavity.

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