The Research On The Characteristics Of Bionic Needle's Puncture Resistance Diversification

In the various kinds of medical devices, the most widely used one is the syringe, whose purpose is subcutaneous injection. But for ordinary people, It is painful and frightening. From the perspective of reducing the pain in patients during injection process, Key Laboratory of Bionic Engineering, Ministry of Education, JiLin University has developed a painless syringe.To meet the natural living environment, biological surfaces have evolved a variety of shapes of non-smooth structure after millions of years of survival of the fittest. Studies have shown that non-smooth structure has an excellent function of drag reduction and wear-resistant, It was adapted to the living environment of biological. I extract and optimize the biological non-smooth morphology in this paper, and apply them to the wall surface of the needle, in order to create undee, serrated, concave, groovy needle. Through a large number of tests to optimize the non-smooth structure of bionic needle, exert myself to find out one bionic needle whose effect of drag reduction is eximious.This article is divided into five parts:1. The designing of undee, serrated, concave, groovy needle. Using a variety of processing methods to machining non-smooth structure on the surface of bionic needle. Testing the needle during its piercing process by silicone body. Determining the puncture rate of needle among the clinical by three-dimensional motion capture device.2. Dealing with the experimental data of the different needle in order to get the optimal test plan and the drag reduction rate. Groovy needle has the best drag reduction rate.3. Using ANSYS/LS-DYNA 12.0 to simulate the process of the bionic needle piercing the muscle soft tissue model, getting the curve of kinetic energy, internal energy and the displacement. The results prove that the bionic needle has drag reduction effect.4. Mechanism of bionic needles'drag reduction: the air stored in the non-smooth structure of the bionic needle change to the secondary vortex during the high-speed movement of the bionic needle. It can change sliding friction into rolling friction between the needle and the skin, reduce the resistance. The decreasing of the contact area between bionic needle and muscle soft tissue can affect the friction during the process of the needle piercing the muscle soft tissue; it is another reason of drag reduction.5. According to GB18457-2001 to apply 20N on the surface of the needle, then measure the deflection. The result shows that all the needles'deflection data is within the specified scope. It account for that, after machining the surface into non-smooth structure, although the rigid strength changed, but it still under the most dangerous level. So the bionic needle is possible to apply to clinical.In this paper, the author have studied the drag reduction of the bionic needle by experimentation and numerical simulation, and researched the processing method, drag reduction mechanism, rigid strength and so on. The research offers a new approach for the development of Medical device.