Study On Corrosion Resistance And Antibacterial Resistance Of Hydrophobic Surface Of Magnesium Alloy Staples Imitating Cicada Wing

Gastrointestinal anastomosis is a crucial operation in gastrointestinal surgery.The wide application of staplers has brought great convenience to gastrointestinal surgery.After gastrointestinal surgery,due to the non-degradable material of the staples,a part of the staples will remain permanently in the anastomosis as a foreign body and accompanied by foreign body reactions after the healing of the gastrointestinal tissue.At the same time,many bacteria in the gastrointestinal tract are prone to lead to bacterial infection and anastomotic complications.The degradability,mechanical properties and biocompatibility of biomedical magnesium alloy make it a potential substitute material for gastrointestinal tissue anastomosis surgery,but it still has the problem of too fast degradation rate and no antibacterial property.Based on this,the cicada-like hydrophobic surface of magnesium alloy was obtained by laser processing and low surface energy modification in this paper.The changes of surface morphology and elements were analyzed by various characterization and test methods,and the influence of texture size parameters on hydrophobicity as well as the influence of hydrophobicity on corrosion resistance and antibacterial properties were studied.The detailed research contents are as follows:(1)Based on the surface structure of cicada wing,a three-dimensional model of cicada wing texture was established.By using ANSYS Fluent,the droplet spreading simulation analysis was carried out on the imitation cicada wing texture surface with different size parameters.It was found that the smaller the side length and spacing of texture,the smaller the contact angle value of the imitation cicada wing texture surface.(2)The imitation cicada wing texture surfaces with different size parameters were obtained by laser processing on the magnesium alloy surface.The results of scanning electron microscopy and energy spectrum analysis showed that the texture quality of the imitation cicadas met the requirements and oxidation reaction occurred during laser processing.The accuracy of the simulation results of wettability was verified through contact angle experiment.(3)Hydrophobic treatment was carried out on the texture surface of the imitation cicadas by modifying with low surface energy materials.The surface morphology and element content of the imitation cicadas were analyzed by scanning electron microscopy and energy spectrum analysis.The contact angle test results show that the smaller the texture dimension parameter,the larger the contact angle value and the better hydrophobicity of the hydrophobic surface of the imitated cicada wing are obtained after hydrophobic treatment,and the hydrophobic surface of the imitated cicada wing has good stability.(4)The results of dilute hydrochloric acid and PBS immersion experiments in vitro showed that hydrophobicity affected the corrosion resistance.The higher the hydrophobicity of the hydrophobic surface,the lower the degradation rate.The results of Escherichia coli adhesion test showed that the hydrophobic surface of the imitation cicada wing had obvious anti-bacterial adhesion effect.