scholarly journals Titanium Oxynitride Coatings Deposited By Magnetron Sputtering For Improvement Of Cardiovascular Stent Design

2018 ◽  
Author(s):  
Oana Cristina Duta ◽  
Denisa Ficai ◽  
Anton Ficai ◽  
Ecaterina Andronescu ◽  
Nataliia Beshchasna ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Stent Design ◽  
Cardiovascular Stent ◽  
Oxynitride Coatings

Effects of Cardiovascular Stent Design on Wall Shear Stress Distribution in Straight and Curved Arteries

2013 ◽  
Vol 284-287 ◽  
pp. 1642-1646
Author(s):  
Hao Ming Hsiao ◽  
Ying Chih Liao ◽  
Chien Han Lin ◽  
Fang Yu Liu ◽  
Yu Ming Tsuei
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Wall Shear Stress ◽  
Shear Stress Distribution ◽  
Stent Design ◽  
Wall Shear Stress Distribution ◽  
Cardiovascular Stent ◽  
Low Shear Stress ◽  
Wall Shear ◽  
Low Shear

he stent is a major breakthrough in the treatment of coronary artery diseases. The permanent vascular implant of a stent, however, changes the intra-stent blood hemodynamics. There is a growing consensus that the stent implant may change the artery wall shear stress distribution and therefore trigger the restenosis process. Several studies have suggested that low shear stress, particularly the shear stress less than 5 dyne/cm2, may lead to endothelial proliferation of smooth muscle cells. Computational fluid dynamics (CFD) has been widely used to analyze hemodynamics in stented arteries. In this paper, CFD models were developed to investigate the effects of cardiovascular stent design on the wall shear stress distribution in straight and curved arteries. Results show that the stent design pattern alone did not have a significant impact on the stent hemodynamics; however, stenting in curved arteries increased the low shear stress area which may lead to higher restenosis rate. The low shear stress area was almost doubled when the degree of artery curvature increased from 0o to 90o. The proposed methodology and findings will provide great insight for future optimization of stent design to reduce the risk of restenosis.

Surface Morphology of Titanium Oxide and Oxynitride Coatings Deposited by Reactive Magnetron Sputtering

2015 ◽  
Vol 1085 ◽  
pp. 134-138 ◽  
Author(s):  
Galina V. Arysheva ◽  
Nina M. Ivanova ◽  
Alla A. Pustovalova ◽  
Maksim E. Konischev
Keyword(s):  
Stainless Steel ◽  
Surface Morphology ◽  
Magnetron Sputtering ◽  
Titanium Oxide ◽  
Reactive Magnetron Sputtering ◽  
Reactive Magnetron ◽  
Vascular Stents ◽  
Coating Surface ◽  
Oxynitride Coatings ◽  
Biocompatible Coatings

This paper presents the results of study of the surface morphology of thin (~ 200 nm) biocompatible coatings based on titanium oxide and oxynitride deposited by reactive magnetron sputtering for vascular stents made from stainless steel. The analysis of the roughness of the coating surface was performed for describe qualitatively their topography.

A Study on Fatigue Test for Cardiovascular Stent

2012 ◽  
Vol 157-158 ◽  
pp. 197-201 ◽  
Author(s):  
Zong Min Ma ◽  
He Yan Dong ◽  
Min Qi
Keyword(s):  
Fatigue Test ◽  
Stent Design ◽  
Cardiovascular Stent ◽  
Fatigue Durability ◽  
Test Instrument ◽  
Test Result

Fatigue durability is an important attributes of cardiovascular stent. This paper develops a stent fatigue test instrument. And then a fatigue test for cardiovascular stent is carried out successfully with this stent fatigue test instrument. The test result shows that the stents tested still maintain integrity after 400 mio fatigue cycles --corresponding to about 10 years. This paper can provide the guidance for the stent design.

Laser structured nitride and oxynitride coatings deposited by middle frequency magnetron sputtering

2019 ◽  
Vol 50 (9) ◽  
pp. 1057-1069
Author(s):  
K. Bobzin ◽  
T. Brögelmann ◽  
N.C. Kruppe ◽  
M. Naderi
Keyword(s):  
Magnetron Sputtering ◽  
Oxynitride Coatings
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