Research Of Micro Piezoelectric Jet Technology Towards The3D Bio-print

As a new technology with rapid development in recent years, Three Dimension (3D)printing technology has been widely used in the manufacturing and other fields becauseof its advantages, for instance, high forming speed and needless for mold. With morerequirements puting forward to the cells in vitro assembly technology andmanufacturing technology in the modern biological tissue engineering techniques, theappearance that cells are used as raw materials for3D printing has become thedevelopment trend of high aspirations. In support of the Thousand Talents program, theresearch on the piezoelectric injection technology for biological3D printing is presentedto lay foundation for the3D printing of biological cells in this paper.Based on the extrusion nozzle structure of the piezoelectric ink jet printer and theone-dimensional wave conduction model from the finite length cylindrical pipe, ainjection device with piezoelectric ceramic, which is driver in the device, is designedand manufactured in this paper. The device solves the problem that large viscosity fluidcannot be used for commercial inkjet printers with direct injection and proposes amethod to tensile glass tube via heating. The stepper motor, linear bearings, controlpanel, signal generator and high voltage amplifier are chosen infer to the piezoelectricnozzle and the three axis injection experiment platform is established.As the only power output component in the injection device, piezoelectric ceramicring affects the effect of the jet directly. According to the characteristics of the radialvibration mode of the piezoelectric ceramic materials and the idea of mason’s equivalentcircuit, the equivalent circuit of the network model is established, to help determine thework frequency of the transducer.With the aid of finite element analysis software named ANSYS, the driving signalswith different parameters are produced using step by step loading method and thesimulation analysis is made to research the influence of different parameters in thedriving signals and the size of the piezoelectric ceramic ring to the drive ability ofpiezoelectric transducer. Driving under the best working state of the input voltagefrequency, holding time and rising and falling edge, provide theoretical basis forinjection experiment.Finally, according to the theoretical results, injection experiments are respectivelydone using water and cell suspension carrier on the injection experiment platform toverify the effectiveness of the device capabilities and to provide a reference forsubsequent3D printing method of cells.