Safe injection device, injector and assembling method thereof

Abstract

A safe injection device relates to the field of medical instruments, and comprises a needle tube (1), a needle seat (2), an elastic part, a slider (4), a needle tip sleeve (5), a protective sleeve (6)and an outer cover (7); the needle seat (2), the elastic part, the slider (4), the needle tip sleeve (5) and the protective sleeve (6) are sequentially sleeved with the needle tube (1) as an axis. The slider (4) is configured to irreversibly rotate after one use. The injection device is simple and reasonable in structure, safe, telescopic and convenient to use, and avoids fear to the needle tip during injection in the using process. After use, the eccentric principle is used; blocking push stroke, when the syringe needle is used, the needle tip cannot be completely pressed down again, the needle tip cannot be exposed anymore, so that the risk of cross infection caused by accidentally touching the needle tip after use is more effectively avoided, the syringe needle is not easy to return tothe original to-be-used position after use due to the structure, the syringe needle is safer after use and cannot be used for the second time, and cross infection is effectively avoided. After the injection device is used, the color sliding block (4) is lifted to warn that the injection device is used.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a safety injection device, a syringe and an assembling method thereof. Background technique [0002] Insulin injection devices such as insulin pens and injection needles have been widely used as a method of treating diabetes. With the increasing number of diabetics, the demand for insulin injection devices is increasing. [0003] The traditional ordinary injection needle includes the needle seat, the needle tube and the outer protective shell. After the protective shell is removed before use, the insulin injection needle is directly exposed to the outside. After use, because there is no safety protection structure, it is easy to accidentally touch the needle and cause cross infection. . At the same time, since there is no necessary protective structure, the injection needle can be used again after use, so there is a very high risk of infection. [0004] Some of the safety in...

AI Technical Summary

Problems solved by technology

[0003]Traditional ordinary injection needles include a needle base, a needle tube and an outer protective shell. After the protective shell is removed before use, the insulin injection needle is directly exposed to the outside. Safety protection structure, so it is easy to accidentally touch the needle and cause cross-infection

At the same time, since there is no necessary protective structure, this kind of injection needle can be used again after use, so there is a very high risk of infection

[0004] Some safety insulin needles in the prior art that solve the above-mentioned common injection needle problems have the following disadvantages: 1. After the injection is completed, the safety insulin needle cannot protect the needle point immediately, but after withdrawing from the injection device such as an insulin pen, , the protective mechanism can protect the needle tip, so there is still the risk of cross-infection due to accidental touch; 2. Insulin is usually injected in the subcutaneous tissue layer instead of the muscle layer, because the muscle layer absorbs quickly and easily causes blood sugar fluctuations. Therefore, when the needle is long or the patient's subcutaneous tissue layer is thin, it not only increases the difficulty of operation, but also makes the injection have a greater risk or even fails to complete the injection; Relatively large, which makes the patient experience poor and increases the difficulty of operation; 4. Many similar safe insulin needles on the market have complex structures, high manufacturing and use costs, and bring financial burdens to diabetic patients

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