Patent ID: 7794433

Claim:
An assembly of plunger and needle hub for a safety syringe needle device comprising: a syringe barrel, which is shaped as a tube and has an interior periphery thereof shaped as a straight tube wherein two opposite ends of the syringe barrel are respectively defined as a front end and a rear end; a needle hub, which is inserted into the syringe barrel and comprises a retaining ring, which is sleeved by a packing ring at the external edge thereof, an accommodating room formed at one end thereof and an axially tapered combining ring, wherein a crease is formed between the interior periphery of the combining ring and the retaining ring, the crease and a plurality of through holes defined by the combining ring and adjacent to the crease provides flexibility to the combining ring, the combining ring can be bent inward to the accommodating room, and the needle hub further comprises a nozzle, which is jutting out from the syringe barrel and for being mounted by a needle; and a plunger, which comprises a plug for being fitly received by the syringe barrel, wherein the plug further has a packing ring sleeved around the edge thereof and the front end of the plug can be coupled with the combining ring of the needle hub, wherein a plurality of teeth are arranged at the upper edge of the combining ring of the needle hub and above of the plurality of through holes.