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US 5,209,739 AGranted
Hypodermic needle
OwnerLeon Talalayinventor
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OwnerLeon Talalayinventor
Estimating the term…
A hypodermic needle assembly comprising a tubular barrel member, a cannula extending from the barrel member, an elastomeric tube connected between the cannula and a fitting at the distal end of the barrel member providing a fluid passage therebetween, the tube being stressed along its length between the cannula and the fitting, releasable means holding the elastomeric tube in a stressed state and means for releasing the cannula from the state in which the tube is stressed such that the elastomeric tube retracts the cannula with sufficient force to pull the cannula out of the patient and place it in a protected position within the barrel. Also disclosed is a structure in which the invention is embodied in a complete hypodermic syringe. Further disclosed is a hypodermic needle assembly in which the invention is adapted for the drawing of blood or other body fluids into an evacuated collection vessel.
A hypodermic needle assembly comprising a tubular barrel member, a cannula extending from said barrel member, an elastomeric tube connected between said cannula and a fitting at the distal end of the barrel member providing a fluid passage therebetween, said tube being stressed along its length between said cannula and said fitting, releasable means holding said elastomeric tube in a stressed state and means for actuating said releasable means whereby said elastomeric tube retracts said cannula within said barrel.
A hypodermic syringe comprising a barrel member, a plunger member slideably received within said barrel member, a cannula extending from said barrel member, holding means at least partially within said barrel member holding said cannula in an extended position, an elastomeric tube within said barrel member connected to said cannula at one end thereof, holding means within and extending axially of said plunger, and holding said cannula in an extended position, a release member in contact with said holding means, said tube being longitudinally stressed between said cannula and said release member and defines a passage therethrough from said cannula, passages defined in said release member to said barrel member whereby a fluid may be accepted in said barrel member as said plunger is withdrawn from said barrel member, said release member being effective to release said holding means and permit said elastomeric tube to retract said cannula into said barrel.
A hypodermic needle assembly comprising a tubular barrel member, a cannula extending from said barrel member, an elastomeric tube connected between said cannula and a fitting of the distal end of the barrel member providing a fluid passage there between, said tube being stressed in an extended state long its length between said cannula and said fitting, releasable means holding said elastomeric tube in a stressed state and means for actuating said releasable means, whereby said elastomeric tube retracts said cannula within said barrel and a needle extending from said fitting away from said cannula.
Dependencies are inferred from the claim text.