Patent ID: 6752784
Filing Date: 2004-06-22
Classification: A61M

Abstract:
In a safety syringe having a barrel, a needle hub movably received in the barrel, a stopper detachably engaged with the needle hub and a plunger slidably received in the barrel and having a head extending out to engage with the stopper, wherein the improvements comprise:the barrel is hollow inside to receive therein the needle hub, the stopper and the plunger and has a step formed on an inner periphery thereof, the needle hub is movably received in the barrel and has a tubular connector formed inside a body for connection with a needle, a hollow cone formed inside the tubular connector and an annular cutout defined in a bridge which is formed to connect the tubular connector to the body, the stopper has an engaging portion formed to correspond to the annular cutout and an extension integrally formed with the engaging portion and being slanted relative to the engaging portion, the plunger has a thumb push formed on an end relative to the head of the plunger, a first hook adapted to be formed on a front portion of the head to correspond to the hollow cone and a second hook adapted to be formed on a rear portion of the head to correspond to the extension of the stopper, whereby after injection rearward movement of the plunger first allows engagement between the second hook and the extension of the stopper so that the stopper is taken away from engagement with the needle hub and then engagement between the first hook and the hollow cone so that the needle hub is pulled inside the barrel and thus the syringe is able to be disposed of safely.