Disposable safety syringe

Abstract

A disposable safety syringe includes a protective cover, an injection needle tube, an injection syringe, and a cylindrical push rod: the protective cover is directly placed on the front end of the injection syringe; the cylindrical push rod extends into the interior of the injection syringe One end of the sleeve is fitted with a sealant ring tightly combined with the inner wall of the injection syringe, and a piston that can be retracted to the inside of the barrel push rod under the action of reverse thrust is provided, and the other end protrudes from the outside of the injection syringe. It is also provided with a push end; the injection needle tube is directly fixed on a needle seat; the front end of the injection syringe is sealed and fixed with a needle seat cover, and a compression spring plug is fixedly arranged at the front end of the needle seat cover. A compression spring is arranged between the spring plug and the needle seat, and the seal ring is used to seal between the needle seat and the needle seat cover; the needle seat cover is a hollow cylinder, and the end fixed to the injection syringe There is at least one barb inside which is used to resist the needle seat and can expand outward under the action of external force.

Description

technical field [0001] The present invention relates to a medical device, and more specifically, relates to a medical and health field used for injecting liquid medicine and preventive vaccines. When the injection is finished, the injection needle is automatically retracted into the injection syringe, and it cannot be used after the injection. Disposable safety syringes for reuse. Background technique [0002] In recent years, disposable sterile syringes have been widely used in injecting liquid medicine and preventing vaccines, and have played a more active role in controlling iatrogenic infectious diseases and preventing cross-infection. However, there are still many defects in the currently used disposable sterile syringes during use: namely, the currently used disposable sterile syringes (including injection needle tubes) are exposed to the outside of the used injection needles and cause sharp injuries. Direct cross-infection of infectious diseases occurs from time to t...

AI Technical Summary

Problems solved by technology

However, there are still many defects in the currently used disposable sterile syringes during use: namely, the currently used disposable sterile syringes (including injection needle tubes) are exposed to the outside of the used injection needles and cause sharps to injure people. Direct cross-infection of infectious diseases occurs from time to time, and at the same time, it can still be kept intact after use, which provides convenience for some criminals to take advantage of the opportunity to recycle, that is, to clean and repack the discarded disposable syringes after use Later, it was sold out again, leading to cross-infection of infectious diseases, bringing extremely unsafe factors to patients, and it is difficult to achieve real one-time use

[0004] There are certain hidden dangers in the use of this disposable syringe:

[0005] (1) The seat cover 4 and the needle seat 2 are only positioned by the O-ring 10, and the injection needle tube 1 will receive a reaction force during the needle sticking process. If the reaction force is large, the needle seat 2 and the needle seat will be easily damaged. The fixation between the seat covers 4 leads to the failure of needle pricking;

[0006] (2) There is a stepped tight fit between the needle seat cover 4 and the compression spring plug 3, so the compression spring 8 may destroy this connection, and the compression spring plug 3 is separated from the needle seat cover 4, so that the compression spring plug 3 and the compression spring plug 3 are separated. The compression spring 8 flies out, which is dangerous and has problems such as inconvenient installation and unsafe hidden dangers during installation;

[0007] (3) Since the push end does not have a limit function, it is easy to misuse when there is no injection (inject liquid medicine into the medicine bottle and then draw the medicine liquid), that is, it is easy to make the stroke of the barrel push rod 7 too large, so that the injection needle tube 1 , the needle seat 2, and the piston 9 enter the inside of the barrel push rod 7 in advance, so that the syringe loses its use value in advance

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