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Needle-free injection is the use of a high velocity jet of liquid is injected into the body , thus completing the process of the injection technique . With the clinical need to promote the development of science and technology , showing a needleless syringe technology booming trend , the United States and Europe have different types of merchandise available, our studies on needle-free injection has just started , there is no demand for the domestic products to market . This paper studies the content is as follows : 1. Introduces the existing domestic and needle- syringe technique , summarizes the existing needleless syringe technical indicators and research and development directions ; 2 . Needleless syringe overall program for the design, according to function , the needleless syringe into mechanical parts , hydraulic parts and electrical control circuit section , for each part of the analysis and determine the eventual adoption of the program ; 3 . according to refine the structure and requirements analysis , theoretical calculations of critical parameters , three-dimensional design to give the product model and simplify the design prototype , verify the feasibility of the principle of a needleless syringe ; 4 . based on the previous design model and the fluid ejection orifice impact model to simulate the design of the machine , to obtain for each injection characteristic of the air spring pressure distribution ; 5 . carry out stability tests , high-speed camera experiment , injection biomimetic Materials pork injection experiments and in vitro experiments , four experimental progressive layers , gradually confirmed the needleless syringe stability of the prototype , the model simulation data with experimental data matching degree , and injecting shape stability , and validated with the injected power increases, the depth of injection increases conclusions. This paper designed mechanical system , electrical control, theoretical analysis on the injection process , process debugging prototype and conducted a variety of experiments to verify the feasibility and reliability of the prototype , completed the preparatory work for the development of new products for the subsequent new improve product development has laid a solid foundation.
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