Patent ID: 7276049

Claim:
A disposable safety syringe for use as a non-detachable disposable syringe having a built-in needle which is fixed inside a needle fixer at the distal end of a syringe cylinder or a detachable disposable syringe having a separate needle which should be assembled with a needle fixer, which has a plunger provided on the inner face of the syringe cylinder, the disposable safety syringe comprising: a locking tab formed at the needle fixer of both types of syringes; a cylinder-shaped movable needle shield which is slidably moved along the cylinder and is fitted on the outer surface of the cylinder; a stopping tab which prevents the needle shield from sliding off the cylinder at the leading end of the needle shield; inserting tabs formed by cuffing part of shield walls at the rear end of the needle shield; locking grooves formed in the end of the inserting tabs; a number of front-end protrusions and a number of rear-end protrusions formed on the inner side of the needle shield; a cylinder grip formed in the rear end of the cylinder; holes formed on the inner face of the cylinder grip to lock with the inserting tabs of the rear end of the needle shield; and a fixing adapter having an engagement sill formed in the inner side thereof and a number of elastic fins in the outer side thereof, which is fitted on the locking tab of the needle fixer.