医学
新生内膜
支架
管腔(解剖学)
冠状动脉支架
镁
血管内超声
植入
心脏病学
外科
内科学
冶金
再狭窄
材料科学
作者
B Heublein,R. Rohde,V. Kaese,M. Niemeyer,Wolfgang Hartung,Axel Haverich
出处
期刊:British heart journal
[BMJ]
日期:2003-06-01
卷期号:89 (6): 651-656
被引量:727
标识
DOI:10.1136/heart.89.6.651
摘要
To develop and test a new concept of the degradation kinetics of newly developed coronary stents consisting of magnesium alloys.Design of a coronary stent prototype consisting of the non-commercial magnesium based alloy AE21 (containing 2% aluminium and 1% rare earths) with an expected 50% loss of mass within six months. Eleven domestic pigs underwent coronary implantation of 20 stents (overstretch injury).No stent caused major problems during implantation or showed signs of initial breakage in the histological evaluation. There were no thromboembolic events. Quantitative angiography at follow up showed a significant (p < 0.01) 40% loss of perfused lumen diameter between days 10 and 35, corresponding to neointima formation seen on histological analysis, and a 25% re-enlargement (p < 0.05) between days 35 and 56 caused by vascular remodelling (based on intravascular ultrasound) resulting from the loss of mechanical integrity of the stent. Inflammation (p < 0.001) and neointimal plaque area (p < 0.05) depended significantly on injury score. Planimetric degradation correlated with time (r = 0.67, p < 0.01).Vascular implants consisting of magnesium alloy degradable by biocorrosion seem to be a realistic alternative to permanent implants.
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