Safe injector

Abstract

The invention discloses a safe injector, which is characterized in that the end part of a core bar is provided with a safe pull-back lock post body, the outer wall of the safe pull-back post body is sequentially provided with an upper limit locking ring and a lower limit locking ring from the top to the bottom. A cylinder neck at the end part of a cylinder is internally and sequentially provided with an upper safe pull-back needle head seat and a lower pull-back base from the top to the bottom, the upper safe pull-back needle head seat and the lower safe pull-back base are both in circular shapes, and the safe pull-back lock post body can penetrate through the central positions of the upper safe pull-back needle head seat and the lower safe pull-back base. The safe injector has reasonableintegral structure, simple operation, no unnecessary step and very good practicability and safety in practical use, can be operated by a single hand, can be assembled in a large scale automatically and has obvious substantial characteristic and remarkable advancement compared with the prior art.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a safety syringe with the effect of locking and pulling back a needle seat, and in particular to its mechanical connection structure. Background technique [0002] Comparative document, patent number: 01113404.6, patentee: Qian Yitian; Lu Weimin, announcement number: CN1390610, this case discloses a "injection needle retractable safety syringe", which consists of a needle body, a needle seat, and a needle body It is composed of a tube, a syringe and a plunger. Its characteristics are: the needle body is composed of a steel needle and a plastic connector; The small body of the needle body is closely matched, which has the function of fixing the needle body and making it retract after the needle body is broken; the front end of the needle body collection tube is equipped with a circular rotating disk with two liquid flow holes, and a needle body retraction hole in the cente...

AI Technical Summary

Problems solved by technology

[0003] The structure of the existing safety syringe is relatively complicated. Although it can achieve the safety effect in theory, it has the following disadvantages: 1. The structure is complex and the cost of mold opening is high, and some structures cannot be molded at all; 2. The stability of the product is poor.

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