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https://www.readbyqxmd.com/read/29908488/effect-of-dissolution-of-magnesium-alloy-az31-on-the-rheological-properties-of-phosphate-buffer-saline
#1
Usman Riaz, Leela Rakesh, Ishraq Shabib, Waseem Haider
The issue of long-term incompatible interactions associated with the permanent implants can be eliminated by using various biodegradable metal implants. The recent research is focusing on the use of degradable stents to restore most of the hindrances of capillaries, and coronary arteries by supplying instant blood flow with constant mechanical and structural support. However, internal endothelialization and infection due to the corrosion of implanted stents are not easy to diagnose in the long run. In the recent past, magnesium (Mg) has been widely investigated for the cardiovascular stent applications...
June 5, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29812907/modified-magnesium-hydroxide-nanoparticles-inhibits-the-inflammatory-response-to-biodegradable-poly-lactide-co-glycolide-plga-implants
#2
Eugene Lih, Chang Hun Kum, Wooram Park, So Young Chun, Youngjin Cho, Yoon Ki Joung, Kwang-Sook Park, Young Joon Hong, Dong June Ahn, Byung-Soo Kim, Tae Gyun Kwon, Myung Ho Jeong, Jeffrey A Hubbell, Dong Keun Han
Biodegradable polymers have been extensively used in biomedical applications, ranging from regenerative medicine to medical devices. However, the acidic byproducts resulting from degradation can generate vigorous inflammatory reactions, often leading to clinical failure. Here we present an approach to prevent acid-induced inflammatory responses associated with biodegradable polymers, here poly(lactide-co-glycolide), by using oligo(lactide)-grafted magnesium hydroxide (Mg(OH)2) nanoparticles, which neutralize the acidic environment...
May 29, 2018: ACS Nano
https://www.readbyqxmd.com/read/29789824/layered-double-hydroxide-poly-dopamine-composite-coating-with-surface-heparinization-on-mg-alloys-improved-anticorrosion-endothelialization-and-hemocompatibility
#3
Hua Li, Feng Peng, Donghui Wang, Yuqin Qiao, Demin Xu, Xuanyong Liu
Magnesium (Mg) and its alloys are promising cardiovascular stent materials due to their favourable physical properties and complete degradation in vivo. However, rapid degradation and poor cytocompatibility hinder their clinical applications. To enhance the corrosion resistance and endothelialization of the AZ31 alloy, a layered double hydroxide (LDH)/poly-dopamine (PDA) composite coating (LDH/PDA) was successfully fabricated. Polarization curves and the electrochemical impedance spectroscopy Nyquist spectrum test proved that the corrosion resistance of the LDH/PDA sample was significantly improved in vitro...
May 23, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29741484/comparison-of-acute-thrombogenicity-for-magnesium-versus-stainless-steel-stents-in-a-porcine-arteriovenous-shunt-model
#4
Michael J Lipinski, Eduardo Acampado, Qi Cheng, Lila Adams, Sho Torii, Jiaxiang Gai, Rebecca Torguson, David G Hellinga, Michael Joner, Claus Harder, Philine Zumstein, Aloke V Finn, Frank D Kolodgie, Renu Virmani, Ron Waksman
Aims The aetiology for reduced thrombogenicity of the Magmaris resorbable magnesium scaffold (RMS) when compared with the Absorb bioresorbable vascular scaffold remains unclear. We therefore investigated whether the Magmaris RMS has platelet-repelling properties by comparing its acute thrombogenicity with an equivalent stainless steel stent in an arteriovenous shunt model. Methods and Results An ex vivo porcine carotid jugular arteriovenous shunt was established and connected to Sylgard tubing containing the Magmaris RMS with sirolimus-eluting PLLA coating and an equivalent 316L stainless steel stent with sirolimus-eluting PLLA coating...
May 8, 2018: EuroIntervention
https://www.readbyqxmd.com/read/29735265/a-quantitative-study-on-magnesium-alloy-stent-biodegradation
#5
Yuanming Gao, Lizhen Wang, Xuenan Gu, Zhaowei Chu, Meng Guo, Yubo Fan
Insufficient scaffolding time in the process of rapid corrosion is the main problem of magnesium alloy stent (MAS). Finite element method had been used to investigate corrosion of MAS. However, related researches mostly described all elements suffered corrosion in view of one-dimensional corrosion. Multi-dimensional corrosions significantly influence mechanical integrity of MAS structures such as edges and corners. In this study, the effects of multi-dimensional corrosion were studied using experiment quantitatively, then a phenomenological corrosion model was developed to consider these effects...
April 25, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29573134/magnetoelastic-galfenol-as-a-stent-material-for-wirelessly-controlled-degradation-rates
#6
Andrew DeRouin, Roger Guillory, Weilue He, Megan Frost, Jeremy Goldman, Keat Ghee Ong
The gold standard of care for coronary artery disease, a leading cause of death for in the world, is balloon angioplasty in conjunction with stent deployment. However, implantation injuries and long-term presence of foreign material often promotes significant luminal tissue growth, leading to a narrowing of the artery and severely restricted blood flow. A promising method to mitigate this process is the use of biodegradable metallic stents, but thus far they have either degraded too slowly (iron) or disappeared prematurely (magnesium)...
March 23, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29562658/association-between-dietary-intake-and-coronary-artery-calcification-in-non-dialysis-chronic-kidney-disease-the-progredir-study
#7
Alisson Diego Machado, Luz Marina Gómez, Dirce Maria Lobo Marchioni, Fernanda Silva Nogueira Dos Anjos, Maria Del Carmen Bisi Molina, Paulo Andrade Lotufo, Isabela Judith Martins Benseñor, Silvia Maria de Oliveira Titan
Coronary artery calcification (CAC) is a widespread condition in chronic kidney disease (CKD). Diet may play an important role in CAC, but this role is not clear. This study evaluated the association between macro-and micronutrient intakes and CAC in non-dialysis CKD patients. We analyzed the baseline data from 454 participants of the PROGREDIR study. Dietary intake was evaluated by a food frequency questionnaire. CAC was measured by computed tomography. After exclusion of participants with a coronary stent, 373 people remained for the analyses...
March 19, 2018: Nutrients
https://www.readbyqxmd.com/read/29538391/in-vitro-study-of-the-inflammatory-cells-response-to-biodegradable-mg-based-alloy-extract
#8
Liang Jin, Jing Wu, Guangyin Yuan, Tongxin Chen
Biodegradable Mg-based alloys have shown great potential as bone fixation devices or vascular stents. As implant biomaterials, the foreign body reaction (FBR) is an important issue to be studied, where the inflammatory cells play a key role. Here, we used two inflammatory cell lines i.e. THP-1 cells and THP-1 macrophages, to evaluate the effect of Mg-Nd-Zn-Zr alloy (denoted as JDBM) extracts on cell viability, death modes, cell cycle, phagocytosis, differentiation, migration and inflammatory response. The results showed that high-concentration extract induced necrosis and complete damage of cell function...
2018: PloS One
https://www.readbyqxmd.com/read/29530821/zinc-based-alloys-for-degradable-vascular-stent-applications
#9
REVIEW
Ehsan Mostaed, Malgorzata Sikora-Jasinska, Jaroslaw W Drelich, Maurizio Vedani
The search for biodegradable metals with mechanical properties equal or higher to those of currently used permanent biomaterials, such as stainless steels, cobalt chromium and titanium alloys, desirable in vivo degradation rate and uniform corrosion is still an open challenge. Magnesium (Mg), iron (Fe) and zinc (Zn)-based alloys have been proposed as biodegradable metals for medical applications. Over the last two decades, extensive research has been done on Mg and Fe. Fe-based alloys show appropriate mechanical properties, but their degradation rate is an order of magnitude below the benchmark value...
April 15, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29519438/degradation-mechanism-of-magnesium-alloy-stent-under-simulated-human-micro-stress-environment
#10
Dexue Liu, Shiwen Hu, Xunyan Yin, Jianjun Liu, Zhi Jia, Qinglin Li
In this study, a vascular stent made of WE43 magnesium alloy was used as a research object and placed in a special physical simulation device constructed independently. This device provided a platform for the study of the degradation of the stent in a dynamic environment. The simulated body fluid of Hank's buffered salt solution flowing inside it would not only make the stent corroded but also apply cyclic shear stress to it, which get closer to the micro-stress environment in human blood vessels. In addition, by means of computer numerical simulation software, ANSYS Fluent 15...
March 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29473378/ureteroscopy-in-pregnant-women-with-complicated-colic-pain-is-there-any-risk-of-premature-labor
#11
Salvatore Butticè, Antonio Simone Laganà, Salvatore Giovanni Vitale, Christopher Netsch, Yiloren Tanidir, Francesco Cantiello, Laurian Dragos, Michele Talso, Esteban Emiliani, Rosa Pappalardo, Tarik Emre Sener
OBJECTIVE: Clinical presentation of ureteral stones during pregnancy is generally with renal colic pain. The aim of this study is to present our experience in the management of renal colic during pregnancy in emergency settings. MATERIALS AND METHODS: 208 pregnant patients who presented to emergency department with renal colic pain and underwent ureteroscopy (URS) due to failed conservative therapy were enrolled in the study. Urinary tract stones were diagnosed either with ultrasound (US) examination or during URS...
December 31, 2017: Archivio Italiano di Urologia, Andrologia
https://www.readbyqxmd.com/read/29376002/a-feasibility-study-of-using-biodegradable-magnesium-alloy-in-glaucoma-drainage-device
#12
REVIEW
Xiang-Ji Li, Lin Xie, Fu-Sheng Pan, Yong Wang, Hong Liu, Yu-Rong Tang, Cindy Ml Hutnik
Technological advances in glaucoma have challenged the traditional treatment paradigm. Historically incisional surgery has been used in cases of advanced disease and/or uncontrolled intraocular pressures resistant to medical or laser interventions. More recently, perhaps due to advancements in imaging, surgery has been suggested to be beneficial earlier in the treatment paradigm. Despite these trends, surgical manipulation of the tissues and unpredictability of wound healing continue to result in surgical failure...
2018: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29284158/optimized-polymer-coating-for-magnesium-alloy-based-bioresorbable-scaffolds-for-long-lasting-drug-release-and-corrosion-resistance
#13
Wei Xu, Kai Yagoshi, Yuki Koga, Makoto Sasaki, Takuro Niidome
Magnesium (Mg) alloy-based bioresorbable scaffolds (BRSs) are attracting interest as next-generation stents. However, because medical Mg alloy materials degrade relatively quickly in physiological media, surface corrosion protection via biodegradable polymer coatings is important for clinical applications. Herein, the influence of biodegradable polymer coatings on the BRS corrosion was investigated. First, elution of the drug sirolimus (SRL) from various biodegradable polymers was estimated, including poly(d,l-lactic acid) (PDLLA), poly(d,l-lactic acid-co-ε-caprolactone) (PLCL) and poly(ε-caprolactone) (PCL)...
March 1, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29081013/emerging-technologies-in-flow-diverters-and-stents-for-cerebrovascular-diseases
#14
REVIEW
Michael Karsy, Jian Guan, Andrea A Brock, Anubhav Amin, Min S Park
PURPOSE OF REVIEW: Stents and flow diverters have revolutionized the treatment of cerebrovascular disease. Guglielmi coils, flexible microcatheters, and first-generation intracranial stents, such as Neuroform (Stryker Neurovascular) and Enterprise stents (Codman/DePuy-Synthes), have paved the way for the development of the Pipeline Embolization Device (PED) (ev3/Covidien/Medtronic) and other endovascular approaches. RECENT FINDINGS: This review discusses the historical development of flow diverter technologies from the PED to similar devices, such as the Surpass stent (Stryker Neurovascular), the Flow-Redirection Endoluminal Device (FRED; MicroVention, Inc...
October 28, 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/29060303/improve-blood-compatibility-of-bioresorbable-magnesium-stents-coated-with-functionalized-anti-cd34-antibody-and-heparin-collagen-multiplayers
#15
Yi-Ping Lai, Chung-Dann Kan
Instentrestenosis and late stent thrombosis continue to be the greatest limitations of drug-eluting stents. In this study, an anti-CD34 antibody functionalized multilayer of heparin/collagen type I is developed by layer-by-layer assemble to enhance biocompatibility and recruit endothelial progenitor cells. The SEM results demonstrate that (Hep/Col)5-coated samples have a rougher surface compared to (Hep/Col)2-coated samples and untreated samples. The EDX and FTIR results both confirmed the presence of heparin and collagen onto the modified samples...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28994804/biodegradable-magnesium-stent-treatment-of-saccular-aneurysms-in-a-rat-model-introduction-of-the-surgical-technique
#16
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
#17
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
#18
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
#19
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
#20
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
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