Pneumatic needleless injector

Abstract

The invention provides a pneumatic needleless injector. The pneumatic needleless injector comprises a dosage adjustment assembly, a shell assembly, a piston assembly, a medicine bottle assembly, a control valve assembly and a needle cylinder assembly, wherein the needle cylinder assembly is positioned at one end of an inner shell, and is fixedly connected with the inner shell through a tightening nut; a plunger piston in the piston assembly is positioned inside a needle cylinder, the small end of a piston is positioned in a piston rod cavity of the inner shell, the large end of the piston is positioned in a piston cavity of the inner shell, and a dosage adjustment tube in the dosage adjustment assembly is positioned inside the piston cavity and is adjacent to the large end of the piston. An end cover in the dosage adjustment assembly is fixedly connected with the inner shell through threads; the dosage adjustment tube is connected with the end cover through threads, so that the effect of adjusting the dosage is achieved. A valve tube in the control valve assembly is positioned in a valve cavity of the inner shell, and operates by coordinating with a control valve, and thus the effect of controlling the movement of the piston is achieved. The medicine bottle assembly is fixedly connected with the shell assembly through screws, and one end of an infusion tube in the medicine bottle assembly is inserted on a water inlet valve cover, so that liquid medicine is conveyed into the needle cylinder.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to a pneumatic needle-free injector. Background technique [0002] Syringes have been used in medicine for more than 300 years. Traditional syringes have brought a lot of convenience to human beings, but with the improvement of human's own living standards, there are some problems of its own, such as easy to cause the spread of infectious diseases, needle infection, shared needles, pain, long-term injection will produce subcutaneous nodules and other unfavorable factors. According to foreign reports, among the 4.4 million medical staff in the United States, 800,000 people are stabbed by needles or medical sharps every year, and 800,000 to 1 million needlestick injuries occur to nurses every year; the situation in my country is not optimistic: due to Infection cases caused by unsafe injections are increasing day by day, causing countless direct economic losses, and 87.5%...

AI Technical Summary

Problems solved by technology

[0003] The existing pneumatic needle-free injectors on the market are complicated in structure and expensive, which limits the popularization of pneumatic needle-free injectors

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