Three-dimensional printed 316L stainless steel cardiovascular stent's electrolytic polishing and its mechanical properties / 生物医学工程学杂志

The interventional therapy of vascular stent implantation is a popular treatment method for cardiovascular stenosis and blockage. However, traditional stent manufacturing methods such as laser cutting are complex and cannot easily manufacture complex structures such as bifurcated stents, while three-dimensional (3D) printing technology provides a new method for manufacturing stents with complex structure and personalized designs. In this paper, a cardiovascular stent was designed, and printed using selective laser melting technology and 316L stainless steel powder of 0-10 µm size. Electrolytic polishing was performed to improve the surface quality of the printed vascular stent, and the expansion behavior of the polished stent was assessed by balloon inflation. The results showed that the newly designed cardiovascular stent could be manufactured by 3D printing technology. Electrolytic polishing removed the attached powder and reduced the surface roughness Ra from 1.36 µm to 0.82 µm. The axial shortening rate of the polished bracket was 4.23% when the outside diameter was expanded from 2.42 mm to 3.63 mm under the pressure of the balloon, and the radial rebound rate was 2.48% after unloading. The radial force of polished stent was 8.32 N. The 3D printed vascular stent can remove the surface powder through electrolytic polishing to improve the surface quality, and show good dilatation performance and radial support performance, which provides a reference for the practical application of 3D printed vascular stent.

Clinical study of gangliosides combined with hyperbaric oxygen therapy on neonatal ischemic encephalopathy / 中国基层医药

Objective To investigate the therapeutic effect of gangliosides combined with hyperbaric oxygen therapy( HBO) in treatment of neonatal ischemic encephalopathy ( HIE) .Methods 68 patients with HIE were ran-domly divided into 4 groups(n=17):the control group,gangliosides group,HBO group and combined group .The con-trol group received conventional therapy ,gangliosides and HBO group received gangliosides and HBO therapy respec-tively and combined group received both gangliosides and HBO therapy .The therapeutic effects were evaluated 10d and 20d after treatment.Results Compared with the control group ,the total efficiency was significantly increased in the combined group(χ2 =5.885,P<0.05),but not in gangliosides and HBO group .Moreover,all treatment groups significantly elevated the neonatal behavioral neurological assessment (NBNA)in day 10 and 20,and there were signif-icant differences between the combined group and gangliosides or HBO group ( t=3.755,P<0.05;t=3.533,P<0.05).Conclusion The use of gangliosides combined with HBO has synergistic interaction in treatment of HIE , which is worthy of clinical application .

Study on the vatimin intakes in diets of type Ⅱ diabitic patients / 中国康复理论与实践

@#ObjectiveTo evaluate the daily vitamin intakes in diets of diabetic patients.MethodsUsing a food questionnaire,the contents of 63 type Ⅱ diabetics(group A) and 64 non diabetics(group B) were recorded and analysised by computer.The daily vitamin intakes were assessed and compared with the Recommend Dietary Allowance(RDA).ResultsThe daily intakes of vitamin B1 and vitamin B2 were both obviously deficient,less than 50% of the RDA.The daily intakes of vitamin E and A were significantly different between group A and group B.ConclusionsThe vitamin intakes of the senile diabetics in diets were inadequate.