A simplified retractable needle hypodermic syringe is provided which includes a barrel having a needle carrier mounted therein with a cannula attached thereto. A slidable plunger is mounted within the barrel which includes a shaft and hub for locking to the carrier. The plunger seal is conveniently mounted...http://www.google.fr/patents/US5342323?utm_source=gb-gplus-shareBrevet US5342323 - Retractable needle syringe and capping system
