Injection head assembly for cartridge of needleless injector, cartridge and needleless injector

Abstract

The present invention relates to an injection head assembly for a cartridge of a needleless injector. The injection head assembly is a two-piece composite structure and comprises a sealing base on theoutside and an injection head body accommodated in the sealing base, wherein an inner contour of the sealing base is matched with an outer contour of the injection head body, and an inner cavity of the sealing base for accommodating the injection head body is formed in a two-section or three-section manner. The invention further relates to a cartridge comprising the injection head assembly and aneedleless injector comprising the cartridge. By the adoption of the injection head assembly for the cartridge of the needleless injector, the cartridge and the needleless injector, a whole functionalperformance structure can be divided into split parts which can be produced by processing technology, and the split parts can be integrated by an assembly mode, so that the functionality is ensured,the processing technology is easy to achieve during production, and a controllable production cost is achieved.

Description

technical field [0001] The present invention relates to medical devices for injecting liquid medicines. More particularly, the present invention relates to an injection head assembly for a drug storage tube of a needle-free injector, a drug storage tube having the injection head assembly, and a needle-free injector having the drug storage tube, especially for pre- Fillable needle-free syringe. Background technique [0002] Needle-free injectors do not require the use of needles, but are a medical device that applies high pressure to liquid medicines to inject them into the patient's subcutaneous skin through micropores at the end, thereby saving patients from the pain of needle sticks. Needle-free injectors typically include a cartridge and a pusher. The function of the medicine tube is to hold the liquid medicine. The medicine tube casing and the piston inside the medicine tube seal the medicine liquid. When the pusher pushes the piston to move, the medicine liquid is pre...

AI Technical Summary

Problems solved by technology

[0007] Difficulty 2: The cost of equipment transformation in pharmaceutical factories is high

The canning production line of the pharmaceutical factory is designed and customized for products with standard specifications. If the form and specification of the pre-filled drug tubes in the pre-filling of the drug solution are greatly different from those of the standard products, the initial equipment cost of production will be incurred. higher

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