Back-pulling type safety self-locking self-destroying syringe

Abstract

A retractable-type safe self-locking-type self-destructing syringe, which comprises a syringe barrel body (6). A plunger (7) is arranged in the syringe barrel body (6). A needle base is arranged in a barrel neck at an end part of the syringe barrel body (6). A sealing ring (3) is sleeved on the outer wall of the needle base. A head part for needle replacement is formed by the upper part of the needle base. A flexible support engaging piece (4) is arranged within a cavity at the lower part of the needle base. A locking-clutching mechanism matching the end part of the plunger (7) is arranged within the flexible support engaging piece (4). The locking-clutching mechanism is provided with a flexible characteristic. Also, a flexible support limiting mechanism matching the inner wall of the cavity of the syringe barrel body (6) is formed by the exterior of the flexible support engaging piece (4). A clutching part matching the locking-clutching mechanism is formed by the end part of the plunger (7).

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a pull-back safety self-locking self-destruction syringe, in particular to its mechanical connection structure. Background technique [0002] Comparative document 1, patent application number: 200910029167.X, applicant: Zhou Ligang, application date: 2009.1.7, publication number: CN101474443A, this case discloses a safe self-destruction medical syringe, the movable needle base and the jacket are equipped with mutual The protruding part and the card platform are overlapped, and the movable needle seat is provided with a hook extending into the injection liquid storage cavity, and the sealing plug is provided with a tightening inclined surface for the hook, and a deflected hole is arranged under the tightening inclined surface. The axis of the deflection hole and the axis of the jacket are arranged in an oblique manner. A fastening chamber for connecting the seal plug and ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many types of self-destructing syringes, and there are also many safety syringes, but the design of the parts is complicated, the processing is difficult, and the assembly is not easy, resulting in high cost; the resistance of the needle tip to withdraw the needle is not enough, and the needle tip is easy to retract into the jacket, resulting in leakage of the drug solution , or deliberately increase the needle withdrawal resistance but also increase the pull-back resistance, which also brings inconvenience to the user; when it is used, the needle seat is prone to rotation, and the force required to trigger the self-destruct device is large, which will cause the needle cylinder to vibrate and fail. Causes pain to the patient; the anti-push piece to prevent misuse requires two-handed operation, and it is necessary to collect the broken off push-push piece

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