Automatic injector

Abstract

The invention discloses an automatic injector. The automatic injector comprises a shell, a needle protecting cover, a push rod, a sounding cylinder, an inner tube, a release ring, a driving elastic piece and a reset elastic piece. When the automatic injector is used, a needle syringe is fixed in the shell; a needle head extends out of the front end of the shell; the needle protecting cover is telescopically connected with the shell; the needle protecting cover can push the release ring to slide towards the rear end of the shell; after the release ring moves to the rear end, a first clip of theinner tube releases snap-in limitation on the push rod; and the push rod pushes a piston under the action of the driving elastic piece to inject liquid in the needle syringe to a part, which needs tobe injected, of a body, thus realizing the goal of automatic injection. After injection is finished, the sounding cylinder is separated from limiting of the inner tube and slides towards the rear endof the shell so as to send out a signal that injection is finished. According to the automatic injector provided by the scheme, the automatic injection function of a pre-filled needle syringe can beachieved by eight parts, and compared with the prior art, the automatic injector is simple in structure, small in number of parts, simple in mechanism action principle and high in reliability.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an automatic injector. Background technique [0002] An auto-injector is a medical device that can automatically inject liquid medicine in a prefilled syringe into a patient's body, meeting the needs of users for self-administration. Auto-injector is a kind of medical device for self-use by patients. Since the average patient is not a professional medical staff, it is usually required that the auto-injector has the characteristics of ease of use, high reliability, and comfortable experience, and can send out a prompt signal after the injection is completed. To help prompt the user to confirm that the injection is complete. [0003] When the existing automatic injectors are in use, puncture and injection are generally achieved by simply pressing the front end of the syringe against the site to be injected and moving the rear end of the syringe by hand. When the front...

AI Technical Summary

Problems solved by technology

[0004] However, the existing automatic injector has a relatively complex structure and a large number of internal parts, which may easily cause product function failure, resulting in poor product reliability, and more product processing and assembly processes, resulting in higher product costs.

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