Safe self-destructive syringe with pullback-type needle head

Abstract

The invention discloses a safe self-destructive syringe with a pullback-type needle head. The safe self-destructive syringe with the pullback-type needle head comprises a cylinder, wherein an inner needle seat body is arranged inside a cylinder neck on the end part of the cylinder; an elastic buffering and limiting mechanism is arranged between the cylinder neck and the inner needle seat body; an asymmetrical pullback and locking component with an elastic function is arranged at the end part of a core rod of the syringe; through the elastic function, the asymmetrical pullback and locking component can be clamped and locked with an externally-sleeved pullback and locking assembly in the inner cavity of the needle seat; in a stressing environment of an asymmetric force, the needle seat can deflect towards one side after the needle seat is pulled back into the cylinder, and an injection needle falls towards one side of the inner wall of the cylinder in the nearly 45-degree angle direction and 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 caused by pushing out the needle head is effectively prevented, and safe self-destructive operation of the syringe is really achieved; and the asymmetric elastic pullback and locking component is a plastic barb body and moulded with the core rod through once mould opening.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a needle retractable 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 notch. The lowe...

AI Technical Summary

Problems solved by technology

[0005] In addition, the same problem exists in the existing single-seat retractable safety self-destruct syringes or safety syringes, which is how to solve the problem of stable engagement between the inner needle seat and the barrel and achieve a certain strength to meet the stability requirements; At the same time, the pulling force required when withdrawing the needle seat should not be too large for ease of use

Although the rigid fitting structure can achieve a stable locking effect between the inner needle seat and the inner wall of the barrel, it is difficult or even impossible to meet the needs of convenient use at the same time

The instability of the plastic material itself and its susceptibility to environmental temperature changes will lead to extremely poor product stability of the hard-fit structure. It is difficult to control the quality and precision during the production process, and it is almost impossible to achieve mass production.

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