| 摘要 |
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.
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