Safety syringe

A safety syringe comprising:

• a barrel with a through hole defined in a front end of the barrel;
• a needle hub detachably engaged with the barrel and having a needle securely engaged at a front end of the needle hub, a flange formed on a rear end of the needle hub and around an outer periphery of the needle hub and a pair of retaining plates extending from the rear end of the needle hub and provided with a slot defined between the pair of retaining plates, wherein one of the pair of retaining plates defines therein an opening;
• a plunger slidably received in the barrel and having ribs axially extending in a longitudinal axis of the plunger, an engaging flange formed at a front end of the plunger and a retaining column extending out from the engaging flange to be detachably received between the pair of retaining plates, the retaining column having a hook formed to correspond to the opening of one of the retaining plates and a slanted face oppositely formed to the fork, whereby when the hook is received in the opening of one of the retaining plates and the needle hub is forced to move into the barrel, the needle hub will be inclined with respect to the barrel;
• and
• a seal securely mounted around the retaining column so as to ensure a water tight engagement between the plunger and the barrel retaining.