| 摘要 |
<p>A retractable syringe, comprising a needle having a tip and a base, a needle collar coupled to the needle and including at least one groove disposed in a bottom portion of the needle collar and extending from the portion of the needle collar nearest to the base of the needle toward the tip of the needle, a fitting coupled to the needle collar and including a sealing element disposed between a first portion of the fitting and the needle collar, a barrel unit designed for coupling to the fitting, a plunger unit having a piston on a first end of the plunger unit, positioned in the barrel unit, an extractor element coupled to the first end of the plunger, having a proximal end adjacent to the plunger, a distal end and designed for coupling to the needle collar and encompassing at least a portion of the at least one groove.</p> |
