Core rod structure for pullback-type safe self-destructive syringe

Abstract

The invention discloses a core rod structure for a pullback-type safe self-destructive syringe. An asymmetrical elastic locking and pullback component is arranged on the end part of a rod body, wherein the pullback component takes a symmetrical central line of a core rod as a central axis; a clamping and locking part is arranged on each of the two sides of the central axis; and the clamping and locking parts on the two sides are asymmetrical. One or both of the clamping and locking parts are elastic, an elastic function ensures that the clamping and locking parts can be smoothly inserted into the inner cavity of a needle seat, and through elastic expansion force, asymmetrical clamping parts on the two sides can be clamped and locked with the clamping and locking parts in the inner cavity of the needle seat; and after the needle seat is pulled back into a syringe cylinder, in a stressing environment of an asymmetric force, the needle seat can automatically deflect towards one side, and an injection needle falls towards one side of the inner wall of the cylinder in the nearly 45-degree angle direction and is locked by the neck part of the cylinder, so that the injection needle and the needle seat cannot be pushed out of the neck part of the cylinder again, secondary damage or cross infection caused by pushing a needle head out of the cylinder again after use is effectively prevented.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a core rod structure for a pull-back safety self-destruction syringe, in particular to its mechanical connection structure. Background technique [0002] Comparative document 1, patent number: ZL200710047077.4, application date: 2007.10.16, announcement number: CN101411908, patentee: Shanghai Toptop Biochemical Technology Co., Ltd. This case discloses "a safe self-destructing vaccine syringe", including Cylinder, a core rod is arranged in the cylinder, a rubber plug is provided near the end of the core rod, a needle is provided in the neck of the cylinder, and a needle tube is provided at the needle, and the feature is that: the rod body side of the end of the core rod The wall is provided with a transverse notch, and the transverse notch communicates with the longitudinal notch at the rod body at the end of the core rod, and the transverse notch matches the longitudinal ...

AI Technical Summary

Problems solved by technology

The metal parts need to be processed and matched or assembled with the core rod. The manufacturing process is complex, difficult and not stable. uncertainties

The existing plastic barb parts still have defects or imperfections in the structure, which leads to potential safety hazards or safety loopholes in the use of the product

Although the existing plastic buckle design can realize the function of pulling back the needle, in use, the needle is still on the normal track after being pulled back, and the needle may be pushed out again, causing the risk of secondary injury to the user

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