injection pen

Abstract

The invention provides an injection pen, which relates to the technical field of medical devices. The injection pen provided by the invention includes an injection pen tube, a hidden needle protection mechanism and an injection mechanism. The injection mechanism includes a needle tube and a needle; the hidden needle protection mechanism includes a hidden needle elastic assembly , the hidden needle cover and the anti-retraction claw, the hidden needle cover is set on the needle, the first end of the hidden needle cover is located outside the injection pen tube, and the second end of the hidden needle cover is located in the injection pen tube and connected with the hidden needle elastic component; The retracting claw is set at one end of the needle tube where the needle is installed; the hidden needle sleeve is provided with an embedded hole that cooperates with the retracting claw, and the embedded hole runs through the side wall of the hidden needle sleeve, and the second end of the hidden needle sleeve is opposite to the hidden needle. When the pen tube moves, the elastic component is compressed, and the anti-retraction claw is inserted into the insertion hole, and the compressed hidden needle elastic component is used to drive the hidden needle sleeve to drive the anti-retraction claw to move out of the injection pen tube. The injection pen provided by the invention alleviates the technical problem in the related art that it is difficult to tell whether the injection pen has been used.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an injection pen. Background technique [0002] Syringe is a common medical device, mainly used for injecting liquid medicine or pumping liquid. Injection pen is a kind of syringe mainly used for injecting micro-drugs, such as insulin and epinephrine. Generally, patients who need to inject insulin or epinephrine, You can inject the medicine yourself according to the prescribed amount and time, and the existing injection pen already has the function of injecting the dose accurately. [0003] In the related art, the injection needle of some injection pens is exposed to the outside after use, which is easy to damage the injection needle. The injection needle of some injection pens is protected by a protective structure. During the injection process, the injection needle protrudes from the protective structure. Before use and After use, the injection needles automatically re...

AI Technical Summary

Problems solved by technology

[0003] In the related art, the injection needle of some injection pens is exposed to the outside after use, which is easy to damage the injection needle. The injection needle of some injection pens is protected by a protective structure. During the injection process, the injection needle protrudes from the protective structure. Before use and After use, the injection needles automatically return to the protective structure, and it is difficult to tell whether the injection pens are in the protective structure.

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