Biomedical metal materials have always been a major biomedical material with a large and wide range of clinical use due to their excellent properties such as high strength and toughness, fatigue resistance, easy forming, and corrosion resistance. They are also the preferred implant material for hard tissues (bones and teeth that need to withstand higher loads) and interventional stents. And nano-medical metal materials have better corrosion resistance and biocompatibility. This article focuses on the changes and improvements in the properties of several typical medical metal materials surfaces after nanocrystallization, and discusses the current problems and development prospects of nano-medical metal materials.
【摘要】 目的 探讨经脐单孔腹腔镜胆囊切除术的临床可行性及其优缺点。 方法 回顾分析2010年7-9月行经脐单孔腹腔镜胆囊切除术34例患者临床资料。 结果 患者均顺利完成单孔腹腔镜胆囊切除术，手术平均时间为65 min，术后平均住院时间为3 d，术后未发生出血、感染、胆瘘等并发症。 结论 单孔腹腔镜胆囊切除术是安全可行的，术后腹部无明显瘢痕，美容效果明显。【Abstract】 Objective To evaluate the feasibility and value of the trans-umbilical single-port laparoscopic cholecystectomy. Methods The clinical data of 34 patients who underwent trans-umbilical single-port laparoscopic cholecystectomy from July to September 2010 were retrospectively analyzed. Results The operations of 34 patients were successfully performed. The mean operative duration was 65 minutes, and the mean duration in hospital after the operation was 3 days. No infection, postoperative bleeding, and biliary leakage occurred postoperatively. Conclusion Trans-umbilical single-port laparoscopic cholecystectomy is safe and feasible with good cosmetic effect.
Objective To determine the safety and efficacy of surgical biliary bypass on the elderly patients with unresectable pancreatic head cancer. Methods The clinical data of 55 cases with unresectable pancreatic head cancer treated with palliation methods from July 2002 to June 2009 in our hospital were retrospectively analyzed. The patients were divided into three groups according to different age and therapeutic program: Nineteen patients, 65 years of age or older, were managed with surgical biliary bypass (group A), 19 patients under 65 years of age were treated by surgical biliary bypass (group B) and 17 patients with the age of 65 years or older received percutaneous transhepatic biliary drainage (group C). Then the therapeutic results were compared.Results With respect to the postoperative level of serum bilirubin, the incidence of early complications, postoperative hospitalization and mean survival time, no statistically significant difference was found between group A and B (Pgt;0.05). There was one case of recurrent jaundice and one case of gastric output obstruction in group B, while no one suffered postoperative complication in group A, and the difference was statistically significant (Plt;0.01). Compared with group A, the postoperative level of serum bilirubin, the number of patient readmitted, the rate of recurrent jaundice and gastric output obstruction were higher in group C (Plt;0.05 or Plt;0.01). The mean postoperative hospitalization and overall survival time were significantly shorter in group C than group A (Plt;0.05 or Plt;0.01, respectively). Conclusion Surgical palliation does not increase the morbidity rate, but it does improve the quality of life in elderly patients with unresectable pancreatic head cancer.