A reusable syringe and method of operation thereof

Abstract

The invention provides a reusable syringe and its working method. The syringe uses the thrust of a potential energy spring to automatically inject medicinal liquid, which includes a push rod, a potential energy spring, a metering adjustment threaded tube, a metering adjustment ratchet connecting rod, a metering adjustment Coil, coil, positioning block, nut tube, fixed tube, screw, needle, injection tube pre-loaded with medicine, injection cannula, the needle touches the skin, the medicine liquid flows out, the resistance at the front end of the pressure head becomes smaller, and the potential energy spring Push the push rod forward, the metering adjustment ratchet connecting rod rotates counterclockwise, driving the coil tube and the positioning block to rotate counterclockwise together, and then the positioning block drives the screw to rotate, the screw moves forward, and the piston in the injection tube is pushed forward by the pressure head Move, the liquid medicine is squeezed out from the needle. The invention utilizes the thrust of the potential energy spring to push the liquid medicine forward for automatic injection. The porous needle of the present invention is provided with a plurality of pinholes, which can realize a single porous injection and relieve the single-point pain of the patient when injecting the medicinal liquid.

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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