Air-pressure type needleless injector power head

Abstract

The invention discloses an air-pressure type needleless injector power head comprising a barrel. A nut cap is sealedly screwed on the upper part of the barrel, and the lower part of the barrel is connected with a medicine injection head; a set of piston assembly with a resetting device is arranged in a barrel bore, the barrel is provided with a movable stop pin which controls the piston to move downwards, a sliding sleeve which controls the movable stop pin is arranged outside the barrel, and the sliding sleeve is connected with a return spring. The air-pressure type needleless injector power head is characterized in that high-pressure air serving as a power source is packaged in a metal thin-wall globule which is arranged in a cavity between the upper part of the piston assembly in the barrel bore and the nut cap; and a pointed drill with a groove, which is fixed in the nut cap, is arranged above the metal thin-wall globule. The power head can ensure that the air-pressure type needleless injector can be stored for a long term.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a pneumatic needle-free injector power head. Background technique [0002] At present, there are basically two types of power sources for needle-free injectors. One is to use a powerful spring as a power source. We call it a spring-type needle-free syringe. Air pressure, the latter we call it a pneumatic needle-free syringe. Due to the complex structure of the spring-type needle-free syringe, the high price, and the large force of the reset operation, it is not generally accepted by the market; the needle-free syringe with detonation air pressure as the power source needs temporary impact ignition, which will generate high temperature and affect Therefore, it is also difficult to popularize; although the pneumatic needle-free syringe packaged with air pressure as the power source has a simple structure and a low price, it can be accepted by the public, but th...

AI Technical Summary

Problems solved by technology

Due to the complex structure of the spring-type needle-free syringe, the high price, and the large force of the reset operation, it is not generally accepted by the market; the needle-free syringe with detonation air pressure as the power source needs temporary impact ignition, which will generate high temperature and affect Therefore, it is also difficult to popularize; although the pneumatic needle-free syringe packaged with air pressure as the power source has a simple structure and a low price, it can be accepted by the public, but there is a technical problem in product development at present, that is, the needle-free syringe is still in storage. The high-pressure gas will leak slowly during the discharge process, and it is difficult to store the product for a long time, and the needle-free syringe packaged with air pressure as the power source can only be used once, and the cost of each injection for consumers is relatively high; Needle-free syringes can be stored for a long time and the power head of the syringe itself can be used repeatedly, which is what manufacturers and consumers want

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