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https://www.readbyqxmd.com/read/28994804/biodegradable-magnesium-stent-treatment-of-saccular-aneurysms-in-a-rat-model-introduction-of-the-surgical-technique
#1
Edin Nevzati, Jeannine Rey, Daniel Coluccia, Donato D'Alonzo, Basil Grüter, Luca Remonda, Javier Fandino, Serge Marbacher
The steady progess in the armamentarium of techniques available for endovascular treatment of intracranial aneurysms requires affordable and reproducable experimental animal models to test novel embolization materials such as stents and flow diverters. The aim of the present project was to design a safe, fast, and standardized surgical technique for stent assisted embolization of saccular aneurysms in a rat animal model. Saccular aneurysms were created from an arterial graft from the descending aorta.The aneurysms were microsurgically transplanted through end-to-side anastomosis to the infrarenal abdominal aorta of a syngenic male Wistar rat weighing >500 g...
October 1, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28894598/mechanical-behavior-of-polymer-based-vs-metallic-based-bioresorbable-stents
#2
REVIEW
Hui Ying Ang, Ying Ying Huang, Soo Teik Lim, Philip Wong, Michael Joner, Nicolas Foin
Bioresorbable scaffolds (BRS) were developed to overcome the drawbacks of current metallic drug-eluting stents (DES), such as late in-stent restenosis and caging of the vessel permanently. The concept of the BRS is to provide transient support to the vessel during healing before being degraded and resorbed by the body, freeing the vessel and restoring vasomotion. The mechanical properties of the BRS are influenced by the choice of the material and processing methods. Due to insufficient radial strength of the bioresorbable material, BRS often required large strut profile as compared to conventional metallic DES...
August 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28894596/magmaris-a-new-generation-metallic-sirolimus-eluting-fully-bioresorbable-scaffold-present-status-and-future-perspectives
#3
REVIEW
Claudio Rapetto, Massimo Leoncini
Drug-eluting stents (DES) have reached a high safety and efficacy profile, becoming the best option for percutaneous coronary interventions (PCI) based revascularization. However, despite their optimal performance, a few concerns remain regarding their use, mainly due to permanent caging of the vessels and its consequences, first of all late stent thrombosis (ST). Bioresorbable scaffolds (BRS) aim to overcome these issues. The results achieved in randomized controlled trials (RCT) by the first generation of poly-L-lactic acid (PLLA) based scaffolds were promising at 1 year, but the first long term reports (albeit flawed by non-optimal implantation technique) have been disappointing, showing, for instance, an increased risk of ST and target vessel myocardial infarction (TV-MI)...
August 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28866142/in-vitro-and-in-vivo-degradation-of-rapamycin-eluting-mg-nd-zn-zr-alloy-stents-in-porcine-coronary-arteries
#4
Yongjuan Shi, Lei Zhang, Jiahui Chen, Jian Zhang, Feng Yuan, Li Shen, Chenxin Chen, Jia Pei, Zhonghua Li, Jinyun Tan, Guangyin Yuan
In this work, rapamycin-eluting poly (d, l-lactic acid) coating (PDLLA/RAPA) was prepared on biodegradable Mg-Nd-Zn-Zr alloy (JDBM) for both in vitro and in vivo investigation of the degradation behaviors of the magnesium alloy stent platform. Electrochemical tests and hydrogen evolution test demonstrated significant in vitro protection of the polymeric coating against magnesium degradation both in short and long term. The 3-month in vivo study on the RAPA-eluting JDBM stent implanted into porcine coronary arteries confirmed its favorable safety, and in the meanwhile revealed similar neointima proliferation compared to the second generation DES Firebird 2 with no occurrence of adverse complications...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28838256/comparative-study-of-different-polymeric-coatings-for-the-next-generation-magnesium-based-biodegradable-stents
#5
Gholamreza Ahmadi Lakalayeh, Mostafa Rahvar, Esmaeil Haririan, Roya Karimi, Hossein Ghanbari
Development of next-generation bioabsorbable stents based on magnesium alloys is gaining lots of attention. However, finding an appropriate coating in order to enhance its corrosion resistance along with preserving other requirements is still a challenge. In this study, three FDA-approved polymers, namely poly(lactic acid), polycaprolactone and poly(lactic-co-glycolic acid), have been investigated as potential coatings for magnesium-based stents to enhance their corrosion resistance, biocompatibility and haemocompatibility...
August 24, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28835063/-process-of-the-degradation-in-vivo-and-biosafety-of-biodegradable-magnesium-alloy-stent
#6
D Yang, Y G Li, L Wang, J Y Lü, D Yu, S J Xin
Objective: To observe the degradation process of biodegradable magnesium alloy stent (BMAS) in vivo in order to evaluate its degradation time and biological safety. Methods: Twenty-four male New Zealand white rabbits were divided into two groups: group A (n=12) and group B (n=12). The BMAS (a total of 12) was implanted in the infrarenal aorta of each rabbit in group A, while group B was the control group, without treatment. Color Doppler ultrasound was used at the 1, 2, 3, 4 months postoperatively to observe the degradation process of stents in group A...
August 22, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28801538/comparison-of-acute-thrombogenicity-for-metallic-and-polymeric-bioabsorbable-scaffolds-magmaris-versus-absorb-in-a-porcine-arteriovenous-shunt-model
#7
Ron Waksman, Michael J Lipinski, Eduardo Acampado, Qi Cheng, Lila Adams, Sho Torii, Jiaxiang Gai, Rebecca Torguson, David M Hellinga, Peter C Westman, Michael Joner, Philine Zumstein, Frank D Kolodgie, Renu Virmani
BACKGROUND: A comparison in acute thrombogenicity between the Magmaris sirolimus-eluting bioabsorbable magnesium scaffold and the Absorb bioresorbable vascular scaffold has not been performed. This study assessed acute thrombogenicity of Magmaris compared with Absorb and the Orsiro hybrid drug-eluting stent in a porcine arteriovenous shunt model. METHODS AND RESULTS: An ex vivo porcine carotid jugular arteriovenous shunt was established and connected to SYLGARD tubing containing the Magmaris, Absorb, and Orsiro scaffolds/stents and allowed to run in the shunt for a maximum of 1 hour...
August 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28797069/biodegradability-and-platelets-adhesion-assessment-of-magnesium-based-alloys-using-a-microfluidic-system
#8
Lumei Liu, Youngmi Koo, Boyce Collins, Zhigang Xu, Jagannathan Sankar, Yeoheung Yun
Magnesium (Mg)-based stents are extensively explored to alleviate atherosclerosis due to their biodegradability and relative hemocompatibility. To ensure the quality, safety and cost-efficacy of bioresorbable scaffolds and full utilization of the material tunability afforded by alloying, it is critical to access degradability and thrombosis potential of Mg-based alloys using improved in vitro models that mimic as closely as possible the in vivo microenvironment. In this study, we investigated biodegradation and initial thrombogenic behavior of Mg-based alloys at the interface between Mg alloys' surface and simulated physiological environment using a microfluidic system...
2017: PloS One
https://www.readbyqxmd.com/read/28780463/arginine-leucine-based-poly-ester-urea-urethane-coating-for-mg-zn-y-nd-alloy-in-cardiovascular-stent-applications
#9
Jing Liu, Pei Wang, Chih-Chang Chu, Tingfei Xi
Selected from the family of self-designed biodegradable amino acid-based poly (ester urea urethane) (AA-PEUU) pseudo-protein biomaterials, arginine-leucine based poly (ester urea urethane)s (Arg-Leu-PEUUs) were used as protective and bio-functional coatings for bio-absorbable magnesium alloy MgZnYNd in cardiovascular stent applications. Comparing with poly (glycolide-co-lactide) (PLGA) coating, the Arg-Leu-PEUU coating had stronger bonding strength with the substrate; in vitro electrochemical and long-term immersion results verified a significantly better corrosion resistance...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28741575/the-drug-eluting-absorbable-magnesium-vascular-scaffold-in-complex-coronary-bifurcations-insights-from-an-in-vivo-multimodality-imaging-study
#10
Johan Bennett, Maarten Vanhaverbeke, Nina Vanden Driessche, Nick Hiltrop, Tom Adriaenssens, Walter Desmet, Peter Sinnaeve, Christophe Dubois
AIMS: This acute in-vivo study sought to provide insights regarding the feasibility of performing complex bifurcation stenting with Magmaris magnesium-alloy bioresorbable scaffolds (Biotronik,Bulach, Switzerland). METHODS AND RESULTS: Twenty-five New-Zealand-White rabbits underwent stenting of non-diseased aorto-iliac bifurcations with Magmaris using provisional (PS,n=5), culotte (n=6), modified-T (n=6), or T-and-protrusion (TAP,n=8) stenting techniques. Angiography, optical coherence tomography and micro-computed tomography were performed...
July 25, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28644215/treatment-of-coronary-stent-restenosis-with-drug-eluting-bioabsorbable-magnesium-scaffolds
#11
Fernando Alfonso, Javier Cuesta, Marcos García-Guimaraes, Teresa Bastante, Ramón Maruri, Fernando Rivero
No abstract text is available yet for this article.
November 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/28446750/expandable-mg-based-helical-stent-assessment-using-static-dynamic-and-porcine-ex-vivo-models
#12
Youngmi Koo, Tarannum Tiasha, Vesselin N Shanov, Yeoheung Yun
A bioresorbable metallic helical stent was explored as a new device opportunity (magnesium scaffold), which can be absorbed by the body without leaving a trace and simultaneously allowing restoration of vasoreactivity with the potential for vessel remodeling. In this study, developed Mg-based helical stent was inserted and expanded in vessels with subsequent degradation in various environments including static, dynamic, and porcine ex vivo models. By assessing stent degradation in three different environments, we observed: (1) stress- and flow-induced degradation; (2) a high degradation rate in the dynamic reactor; (3) production of intermediate products (MgO/Mg(OH)2 and Ca/P) during degradation; and (4) intermediate micro-gas pocket formation in the neighboring tissue ex vivo model...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28433790/a-strain-mediated-corrosion-model-for-bioabsorbable-metallic-stents
#13
E Galvin, D O'Brien, C Cummins, B J Mac Donald, C Lally
This paper presents a strain-mediated phenomenological corrosion model, based on the discrete finite element modelling method which was developed for use with the ANSYS Implicit finite element code. The corrosion model was calibrated from experimental data and used to simulate the corrosion performance of a WE43 magnesium alloy stent. The model was found to be capable of predicting the experimentally observed plastic strain-mediated mass loss profile. The non-linear plastic strain model, extrapolated from the experimental data, was also found to adequately capture the corrosion-induced reduction in the radial stiffness of the stent over time...
April 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28397881/a-promising-biodegradable-magnesium-alloy-suitable-for-clinical-vascular-stent-application
#14
Lin Mao, Li Shen, Jiahui Chen, Xiaobo Zhang, Minsuk Kwak, Yu Wu, Rong Fan, Lei Zhang, Jia Pei, Guangyin Yuan, Chengli Song, Junbo Ge, Wenjiang Ding
We report a Mg alloy Mg-2.2Nd-0.1Zn-0.4Zr (wt.%, denoted as JDBM-2) showing great potential in clinical vascular stent application by integrating the advantages of traditional medical stainless steel and polymer. This alloy exhibits high yield strength and elongation of 276 ± 6 MPa and 34.3 ± 3.4% respectively. The JDBM-2 with a stable degradation surface results in a highly homogeneous degradation mechanism and long-term structural and mechanical durability. In vitro cytotoxicity test of the Mg extract via human vascular endothelial cells (HUVECs) indicates that the corrosion products are well tolerated by the tested cells and potentially negligible toxic effect on arterial vessel walls...
April 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28290901/-ability-to-overcome-the-thrombocyte-resistance-to-acetylsalicylic-acid-in-patients-with-coronary-artery-disease-after-myocardial-revascularization-with-coronary-stenting
#15
I V Pershukov, S L Ostaschenko, T N Kuznetsova, S N Scherbo, Z A Karben, E V Sokryukina, A A Omarov, D M Ramazanov, N V Bosak, L V Shulzhenko, R K Kalmatov, T A Batyraliev, B A Sidorenko
Resistance to acetylsalicylic acid (ASA) in patients with coronary artery disease is a poor predictor for the development of atherothrombotic complications. In 277 patients with coronary artery disease suffered uncomplicated coronary angioplasty with stent implantation, we was estimated arachidon-induced platelet aggregation during treatment with acetylsalicylic acid by bedside VerifyNow Assay test at 28-90 days after the intervention. It was found that 18.9% of the 144 patients receiving a combination of ASA 75 mg with 15...
July 2016: Kardiologiia
https://www.readbyqxmd.com/read/28286555/silicone-covered-biodegradable-magnesium-stent-insertion-in-the-esophagus-a-comparison-with-plastic-stents
#16
Yue-Qi Zhu, Kai Yang, Laura Edmonds, Li-Ming Wei, Reila Zheng, Ruo-Yu Cheng, Wen-Guo Cui, Ying-Sheng Cheng
BACKGROUND: We determined the feasibility of, and tissue response to silicone-covered biodegradable magnesium- and plastic-stent insertion into the esophagus in rabbits. METHODS: The mechanical compression-recovery characteristics and degradation behaviors of the magnesium stent were investigated in vitro. A total of 45 rabbits were randomly divided into a magnesium- (n = 15) and a plastic- (n = 15) stent group, and underwent stent insertion into the lower third of the esophagus under fluoroscopic guidance; a control group (n = 15) did not undergo the intervention...
January 2017: Therapeutic Advances in Gastroenterology
https://www.readbyqxmd.com/read/28262623/second-generation-magnesium-scaffold-magmaris-device-design-and-preclinical-evaluation-in-a-porcine-coronary-artery-model
#17
Ron Waksman, Philine Zumstein, Martin Pritsch, Eric Wittchow, Michael Haude, Capucine Lapointe-Corriveau, Guy Leclerc, Michael Joner
AIMS: The second-generation drug-eluting absorbable magnesium scaffold Magmaris, recently introduced for the treatment of obstructive coronary atherosclerotic lesions, suggests a good safety profile, but preclinical assessment is important for predicting clinical performance. The aim of the present study was to assess subacute and long-term safety as well as pharmacokinetic properties of the Magmaris compared with a current-generation metallic DES and an approved BRS in porcine and rabbit animal models...
July 20, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28124747/intermediate-analysis-of-magnesium-alloy-covered-stent-for-a-lateral-aneurysm-model-in-the-rabbit-common-carotid-artery
#18
Hong-Kai Cui, Fen-Bao Li, Ying-Chang Guo, Yong-Li Zhao, Rui-Fang Yan, Wu Wang, Yong-Dong Li, Yong-Li Wang, Guang-Yin Yuan
OBJECTIVE: To analyze the outcomes of a magnesium alloy covered stent (MACS) for a lateral aneurysm model in common carotid artery (CCA). METHODS: In 32 rabbits, a MACS (group A, n = 17) or a Willis covered stent (WCS; group B, n = 15) was inserted and the rabbits were sacrificed 1, 3, 6, or 12 months after stenting. Angiography and intravascular ultrasound (IVUS) were performed at 3, 6, and 12 months. Scanning electron microscopy was performed for six stents in each group at 1, 3, and 6 months, and histopathology and histomorphology were conducted at 3 (n = 4), 6 (n = 4), and 12 (n = 12) months...
September 2017: European Radiology
https://www.readbyqxmd.com/read/28013101/ex-vivo-blood-vessel-bioreactor-for-analysis-of-the-biodegradation-of-magnesium-stent-models-with-and-without-vessel-wall-integration
#19
Juan Wang, Lumei Liu, Yifan Wu, Manfred F Maitz, Zhihong Wang, Youngmi Koo, Ansha Zhao, Jagannathan Sankar, Deling Kong, Nan Huang, Yeoheung Yun
Current in vitro models fail in predicting the degradation rate and mode of magnesium (Mg) stents in vivo. To overcome this, the microenvironment of the stent is simulated here in an ex vivo bioreactor with porcine aorta and circulating medium, and compared with standard static in vitro immersion and with in vivo rat aorta models. In ex vivo and in vivo conditions, pure Mg wires were exposed to the aortic lumen and inserted into the aortic wall to mimic early- and long-term implantation, respectively. Results showed that: 1) Degradation rates of Mg were similar for all the fluid diffusion conditions (in vitro static, aortic wall ex vivo and in vivo); however, Mg degradation under flow condition (i...
December 21, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27869217/magnesium-alloy-covered-stent-for-treatment-of-a-lateral-aneurysm-model-in-rabbit-common-carotid-artery-an-in-vivo-study
#20
Wu Wang, Yong-Li Wang, Mo Chen, Liang Chen, Jian Zhang, Yong-Dong Li, Ming-Hua Li, Guang-Yin Yuan
Magnesium alloy covered stents have rarely been used in the common carotid artery (CCA). We evaluated the long-term efficacy of magnesium alloy covered stents in a lateral aneurysm model in rabbit CCA. Magnesium alloy covered stents (group A, n = 7) or Willis covered stents (group B, n = 5) were inserted in 12 New Zealand White rabbits and they were followed up for 12 months. The long-term feasibility for aneurysm occlusion was studied through angiograms; the changes in vessel area and lumen area were assessed with IVUS...
November 21, 2016: Scientific Reports
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