Small-dose safety destructing insulin syringe

Abstract

The invention provides a small-dose safety destructing insulin syringe, comprising a hollow syringe, a push rod capable of sliding in the syringe and a rubber plug mounted at the front end of the push rod, wherein a needle stand detached from the syringe is mounted at the front end of the syringe, a frustum is formed at the front end of the push rod, at least two elastic hooks are mounted at the lower end of the needle stand, a locking ring in interference fit with the inner wall of the syringe is arranged under the elastic hooks, a first elastic pawl clamped with the frustum is arranged in the hole in the locking ring, a card core capable of extending into the hole in the elastic hooks is formed on the locking ring, the chamber of needle stand is blocked by the card core, a grab is arranged on the card core, the frustum at the front end of the push rod can be clamped with the first elastic pawl in the locking ring, the locking ring is driven by drawing the push rod down to slide down so that the grab is clamped with the elastic hooks, the needle stand is driven by the locking ring to be detached from the inner wall of the syringe. The invention has the beneficial effect: the needle stand can be detached from the inner wall of the syringe by applying less pulling force, the bubble can not be generated at the top of the rubber plug, the residue amount of injection solution in the syringe after injection is less.

Description

technical field [0001] The invention belongs to a medical appliance, in particular to a small-dose safe self-destruct insulin syringe. Background technique [0002] Syringes are an indispensable tool in medical treatment. In order to avoid cross-infection of blood, the current syringes are all disposable products, but this kind of disposable syringes can be reused if they are not artificially destroyed. Disposable syringes are reused to cause cross-infection and spread diseases, and many syringes have emerged as the times require. For example, pull-back safety syringes, when the push rod is pulled back, the injection needle is followed into the syringe, but when pushed by an external force, the needle will come out, which will also cause cross-infection. There is also a pull-back safety syringe 200410017938.0. When the push rod is pulled back, the injection needle will follow into the syringe, and the needle will be tilted to one side, making it difficult to pull out, but t...

AI Technical Summary

Problems solved by technology

In addition, there is a defective part on the push rod. After the injection, the push rod is broken by force, destroying the push rod, and reaching self-destruction. Although the push rod of this type of syringe is destroyed, it can still be used after changing the push rod, which cannot achieve the goal of self-destruction. For the purpose of complete safety, in addition, the front end of the piston of this type of syringe is not on the zero line (that is, the piston is not pushed to the bottom) before the liquid (blood) is drawn. The (blood) dose is not standard. On the other hand, there is more air in the syringe when the syringe is not in use. The head of the push rod of this type of syringe is higher than the rubber stopper, which will generate air at the top of the rubber stopper. The air in the syringe needs to be discharged first, especially for small-dose syringes such as insulin syringes, it will be more difficult to discharge the air. After the syringe is injected, there will be injection fluid residue, which cannot meet the low-residue standard

In addition, for small-dose syringes such as insulin syringes, the needle seat and the syringe are generally tightly matched, and there is no O-ring installed between the two, which will cause leakage of the injection during injection.

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