Reusable injector and working method thereof

Abstract

The invention provides a reusable injector and a working method thereof. The injector can automatically inject liquid medicine by utilizing the thrust of a potential energy spring, and comprises a push rod, the potential energy spring, a metering adjustment threaded pipe, a metering adjustment ratchet connecting rod, a metering adjustment coil pipe, a coil pipe, a locating fixture block, a nut pipe, a fixed pipe, a screw rod, a needle head, an injection tube pre-filled with drug and an injection sleeve; when the needle head is contacted with the skin, the liquid medicine flows out, the resistance at the front end of a press head becomes small, the push rod is pushed forward by the potential energy spring, the metering adjustment ratchet connecting rod makes counterclockwise rotation so as to drive the coil pipe and the locating fixture block to rotate counterclockwise together, the screw rod is then driven to rotate by the locating fixture block, the screw rod moves forward, a piston in the injection tube is pushed to move forward by the press head, and the liquid medicine is extruded out from the needle head. The injector pushes the liquid medicine forward by utilizing the thrust of the potential energy spring, thus realizing automatic injection. A plurality of needle holes are formed in the porous needle head, so that porous injection can be realized at a time, and single-point pain of a patient caused in a liquid medicine injection process is relieved.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a reusable syringe and a working method thereof. Background technique [0002] Needle-free syringe is a device that injects by pressure. Its principle is to generate strong power through the release of the spring in the syringe, and quickly push the liquid medicine in the ampoule at the front end of the syringe. The form passes instantly through the surface cells and penetrates into the subcutaneous tissue, completing the injection. Its advantage is that it eliminates the fear of needles and eliminates the pain of the injected person. [0003] For example, the Chinese invention patent CN101829381A discloses a disposable adjustable metering insulin injection pen, which includes a pen cap, a needle, an injection tube with a built-in piston and pre-loaded medicine, an injection sleeve, a positioning block, a screw, a nut tube, a fixed tube, Coil tube, clutch tu...

AI Technical Summary

Problems solved by technology

However, the present invention can only realize quantitative injection, and cannot adjust the metering steplessly, and the scope of application is small, and the screw rod of the present invention cannot be retreated, so it is also disposable and cannot be reused

[0004] From the above, it can be seen that the current insulin injection pens are all disposable and need to be discarded when they are used up, which is a serious waste of resources. There is an urgent need to design a syringe with stepless adjustable metering, single tube multiple injections, single multi-point administration, and a syringe body that can reusable syringe

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