A safety hypodermic syringe having a flexible safety cap covered on a hollow stopper around the arrowhead tip of the plunger, such that liquid medicine is completely forced out of the barrel through the needle cannula before forcing the arrowhead tip of the plunger into engagement with the connector...http://www.google.fr/patents/US6613016?utm_source=gb-gplus-shareBrevet US6613016 - Safety hypodermic syringe
