Disposable safety syringe

Abstract

A disposable safety syringe designed to prevent syringe handlers from being pricked by a needle by covering the needle with a needle shield, is provided. Special attention should be given to syringe needles because they are sharp enough to cause needle stick injuries before and after use. In particular, if a user is accidentally injured by a blood-stained needle, serious infections might be caused through the needle. Accordingly, the needle is covered with the needle shield after use. The needle shield is fitted over a syringe cylinder. A stopping tab prevents the needle shield from sliding off the cylinder. Inserting tabs are formed by cutting part of shield walls, and locking grooves are formed in the end of the inserting tabs. A fixing adapter has 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.

1 . 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 cutting part of shield walls at the rear end of the needle shield, in which each inserting tab includes an elastic piece and a support piece between which a cut-off gap is formed, wherein the support piece has a coupling groove therein;    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;    a hole 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.    
   
   
       2 . A disposable safety syringe of  claim 1 , further comprising triangular guiders which guide the inserting tabs of the needle shield and are formed at both left and right sides on the surface of the cylinder, respectively.