Rosenberg, Klein & Bilker
Safety vein syringe with retractable standard needle
 A safety vein syringe with retractable standard needle, including a syringe barrel, a plunger, an injection needle and a guiding mechanism formed between the needle holder and the plunger. By means of the guiding mechanism, the plunger can be only axially moved within the barrel without rotation and two needle pulling members can be easily aligned with each other and latched together. A commonly used standard needle holder is replaceably connected with a second needle holder, whereby a user can replace the injection needle with another type of injection needle as necessary. The first needle pulling member is formed on the needle holder or the plunger, having at least one rotatable click. The second needle pulling member is formed on the plunger or the needle holder, having a detent. When the piston of the plunger is pushed to the bottom, the detent is easily and firmly engaged and hooked with the click. Thereafter, the injection needle and the needle holder can be together pulled into the barrel with the tip of the injection needle positioned under the shoulder section of the barrel. Then the plunger is further pushed to press the tip against the shoulder section and bend the tip so as to destroy the injection needle. 
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Wen-Neng
Liu