Dose limiting structure and syringe

Abstract

This utility model relates to the field of medical device technology, and in particular to a dosage limiting structure and syringe. The dosage limiting structure includes an insertion rod, a limiting ring, and a driving sleeve. The limiting ring is sleeved on the outside of the driving sleeve and connected to it. The insertion rod and the limiting ring are linked around their axis. The front end of the insertion rod has a linkage part around its axis. The rear side of the driving sleeve has a linkage groove corresponding to the linkage part. The outer side of the driving sleeve has an abutment part located in front of the limiting ring, which limits the forward movement of the limiting ring. In summary, when the user adjusts the injection dose to the maximum dose, the limiting ring and the abutment part abut against each other, effectively preventing the user from continuing to rotate the insertion rod to further increase the dose, thereby reducing the risk of inaccurate injection dosage, drug leakage, and safety accidents.

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