Abstract: A safety device for syringes includes a sleeve mounted to the barrel of the syringe and a connection member is movably received in the sleeve and two ends of the connection member are respectively and securely connected to a needle assembly and the barrel. The sleeve is slid toward the needle assembly to kick the cap off and then pulled back to expose the needle to proceed syringing. After finishing the syringing process, the sleeve is slid toward the needle assembly again to let the pawls of the connection member be securely engaged with the grooves of the sleeve and the needle is received in the sleeve.

Abstract: A safety hypodermic syringe includes a barrel and a base is movably received in the barrel. A cylindrical connection piece is engaged with the engaging recess. A needle cannula unit is fixed connected to the base and extends out from the barrel. A plunger has an insertion which is inserted through the hole in the connection piece and into the passage in the base. The insertion is securely engaged with the connection piece. A breaking groove is defined in an outer periphery of the plunger and located close to the second end of the plunger. The base together with the needle cannula unit are pulled in the barrel after injection and the plunger is broken to leave the needle cannula unit in the barrel.

Abstract: A safety device for syringes includes a sleeve mounted to the barrel of the syringe and a connection member is movably received in the sleeve and two ends of the connection member are respectively and securely connected to a needle assembly and the barrel. The sleeve is slid toward the needle assembly to kick the cap off and then pulled back to expose the needle to proceed syringing. After finishing the syringing process, the sleeve is slid toward the needle assembly again to let the pawls of the connection member be securely engaged with the grooves of the sleeve and the needle is received in the sleeve.