Abstract: A disposable needle assembly for a hypodermic syringe. A hypodermic needle is slidably mounted to a syringe main body having removably inserted therein a glass anesthetic carpule. The inwardly positioned end of the needle extends piercingly into the carpule. A plunger slidably mounted to the syringe main body has an inwardly positioned end secured to a rubber stopper slidably mounted within the carpule. Inward movement of the plunger forces the stopper toward the needle inner end injecting the material within the carpule outwardly and eventually affixing the needle inner end to the stopper. Retraction of the plunger pulls the needle completely into the carpule for subsequent destruction therewith.