Injector

Abstract

The invention relates to the technical field of medical apparatus and instruments, in particular to a syringe which comprises a needle cylinder which comprises a needle head mounting cavity and a pushrod mounting cavity; a pull-back piece which is mounted in the needle head mounting cavity and suitable for mounting a needle head, wherein a clamping part is arranged at one end of the pull-back piece; a push rod which is arranged in the push rod mounting cavity, wherein a first containing cavity and a second containing cavity are formed in the end of the push rod, the sectional area of the first containing cavity is smaller than that of the second containing cavity, and the first containing cavity is defined by a closed curved surface structure; and when the push rod is inserted into the pull-back piece, the clamping part penetrates through the first accommodating cavity and is clamped into the second accommodating cavity. According to the self-destruction syringe, the self-destructioneffect is effectively achieved, and the disposable syringe is prevented from being used again after being used.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a syringe. Background technique [0002] Syringes are a common and widely used medical device. It is mainly used for liquid medicine or blood test. In recent years, in order to avoid repeated use and cross-infection of syringes, the use of disposable sterile syringes has been promoted. However, since the disposable sterile syringe remains intact after use, it can be reused, which gives some criminals an opportunity to take advantage of it, bringing the hidden danger of cross-infection and easily causing the spread of disease. [0003] For example, the Chinese patent document CN110876824A discloses a syringe comprising a needle, a needle seat, a pullback member, a syringe and a push rod. An opening is provided at the end of the push rod so as to facilitate the insertion of the push rod. The push rod is inserted into the pull-back member, and when the push rod is retrac...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the syringe in the prior art cannot effectively realize the self-destruct function when in use, so as to provide a syringe that can achieve the expected effect and can effectively realize the self-destruct function. the syringe

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