Abstract: A syringe safety sleeve has an inner sleeve and an outer sleeve. The inner sleeve selectively attaches to a conventional syringe and is slidably mounted inside the outer sleeve. The outer sleeve has an open proximal end and an open distal end. The inner sleeve has an open proximal end, an open distal end and a barrel connector formed on the open distal end. The open proximal end of the outer sleeve is selectively connected to the open proximal end of the inner sleeve when the outer sleeve is pulled out from the inner sleeve. The barrel connector of the inner sleeve attaches to a conventional syringe. The syringe safety sleeve can accommodate ordinary syringes a safety device to protect the used needle. The syringe safety sleeve can be conveniently connected to the syringe and has a simple structure.

Abstract: A safety syringe has a barrel, a needle hub movably received in the barrel and having a hollow cone with a flange formed on an inner periphery of the hollow cone and a plunger with a hook formed to correspond to the flange of the needle hub such that when the hook engages with the flange of the needle hub, the needle hub is ready to be pulled back into the barrel by a rearward movement of the plunger so that the syringe is ready to be disposed of safely.