Continuously-adjustable pneumatic needle-free injection apparatus

Abstract

The invention relates to a medical apparatus, in particular to an injection tool and discloses a continuously-adjustable pneumatic needle-free injection apparatus. The injection apparatus comprises anampoule needle tubing, an ampoule needle tubing hoop, an ampoule barrel, an ampoule push rod, a shell, a piston handle, a piston rod, a spring, an air cylinder, a handle, an air pump, a two-positionthree-way valve and a switch. The injection apparatus is characterized in that an air inlet hole of the two-position three-way valve in the handle is communicated with the air pump through an air tubeand connected with the air cylinder through an inflation hole. The rear portion of the ampoule needle tubing mounted at the front end of the shell is provided with an external thread, matched with aninternal thread of the ampoule barrel, of the ampoule needle tubing hoop. The spring externally sleeves the piston rod mounted in the air cylinder and is in slide fit with the piston rod. The continuously-adjustable pneumatic needle-free injection apparatus is simple in structure, convenient to operate and available for continuous operation and injection dosage adjustment.

Description

technical field [0001] The invention relates to a medical device, especially an injection tool. Background technique [0002] The existing "High Pressure Needle-Free Painless Syringe" is a relatively advanced hypodermic injection tool in modern times, and it has the advantages of painlessness, safety and no infection compared with traditional needle-equipped syringes. To use it, it must be installed in a special reset box first, and then moved by hand, compress the spring, and use the impact force generated by the release spring to inject the medicinal liquid in the ampoule bottle into the skin. Apparently, using the syringe is time-consuming, labor-intensive, cumbersome to operate, and cannot work continuously. [0003] Although the "Electric Needle-Free Injector" with the patent number ZL2007201131986.4 partially overcomes the defects of the "High-pressure Needle-Free and Painless Injector" and can work continuously, its structure is complicated, especially the connection...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a pneumatic needle-free injection device that can not only work continuously but also adjust the dose, has a simple structure and is easy to operate, aiming at the defects of the existing "high-pressure needle-free and pain-free injector" and "electric needle-free injector".

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