vestiftИзвестия Национальной академии наук Беларуси. Серия физико-технических наукProceedings of the National Academy of Sciences of Belarus. Physical-technical series1561-83582524-244XThe Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8358-2021-66-2-161-168vestift-663Research ArticleМАТЕРИАЛОВЕДЕНИЕ, МЕТАЛЛУРГИЯMATERIALS SCIENCES AND ENGINEERING, METALLURGYЭлектрохимическое полирование матричных стентов из стали 316LVM с использованием микросекундных импульсовElectrochemical polishing of matrix stents of the 316LVM steel using microsecond pulseshttps://orcid.org/0000-0002-1582-004XАлексеевЮ. Г.AliakseyeuY. G.

Алексеев Юрий Геннадьевич – кандидат технических наук, доцент, генеральный директор – проректор по производственной деятельности

ул. Я. Коласа, 24, 220013, Минск, Республика Беларусь

Yury G. Aliakseyeu – Ph. D. (Engineering), Assistant Professor, General Manager – Vice-Rector on Production Activity

24, Ya. Kolas Str., 220013, Minsk, Republic of Belarus

y.aliakseyeu@bntu.byhttps://orcid.org/0000-0002-0841-1272КоролевА. Ю.KorolyovA. Yu.

Королев Александр Юрьевич – кандидат технических наук, доцент, заведующий научно-исследовательским сектором перспективных технологий

ул. Я. Коласа, 24, 220013, Минск, Республика Беларусь

Aleksandr Yu. Korolyov – Ph. D. (Engineering), Assistant Professor, Head of Prospective Technologies Department

24, Ya. Kolas Str., 220013, Minsk, Republic of Belarus

korolyov@park.bntu.byhttps://orcid.org/0000-0003-2773-0110НиссВ. С.NissV. S.

Нисс Владимир Семенович – кандидат технических наук, доцент, заведующий инновационно-производственным центром медицинского оборудования и изделий

пр. Независимости, 65, 220013, Минск, Республика Беларусь

Vladimir S. Niss – Ph. D. (Engineering), Assistant Professor, Head of the Innovation and Production Center of Medical Equipment and Products

65, Nezavisimosti Ave., 220013, Minsk, Republic of Belarus

niss@park.bntu.byhttps://orcid.org/0000-0002-6022-7448БудницкийА. С.BudnitskyA. S.

Будницкий Алексей Сергеевич – младший научный сотрудник

ул. Я. Коласа, 24, 220013, Минск, Республика Беларусь

Alexey S. Budnitskiy – Junior Researcher

24, Ya. Kolas Str., 220013, Minsk, Republic of Belarus

budnitskiy@park.bntu.byНаучно-технологический парк БНТУ «Политехник»Scientific and Technological Park BNTU “Polytechnic”Белорусский национальный технический университетBelarusian National Technical University202116072021662161168Copyright © Алексеев Ю.Г., Королев А.Ю., Нисс В.С., Будницкий А.С., 20212021Алексеев Ю.Г., Королев А.Ю., Нисс В.С., Будницкий А.С.Aliakseyeu Y.G., Korolyov A.Y., Niss V.S., Budnitsky A.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestift.belnauka.by/jour/article/view/663

С развитием технологии малоинвазивного лечения коронарные стенты из коррозионностойких сталей получили широкое распространение при восстановлении проходимости кровеносных сосудов. Эффективность стентирования коронарных сосудов зависит от различных факторов, однако основным фактором является качество поверхности стентов. Чем выше качество поверхности стента, тем меньше негативное влияние оказывается на кровеносную систему, стенки артерий и тем выше биологическая совместимость стента. Сложная форма, малое сечение, размеры и низкая жесткость коронарных стентов являются основными причинами невозможности обеспечения высокого качества поверхности с использованием механических способов финишной обработки. Поэтому для полирования стентов применяются электрохимические методы. Для электрохимического полирования (ЭХП) стентов традиционно используется электрический режим, основанный на постоянном токе. Недостатками ЭХП на постоянном токе являются чрезмерный съем металла и необходимость использования электролитов сложных составов, часто содержащих токсичные компоненты. В качестве альтернативы традиционному ЭХП с применением постоянного тока нами для полирования стентов предложен метод импульсного ЭХП с использованием импульсов микросекундной длительности. Применение импульсного тока позволяет добиться существенного повышения эффективности процесса ЭХП, когда за счет локализации анодного растворения скорость сглаживания микронеровностей обрабатываемой поверхности, отнесенная к общему съему металла, значительно возрастает. Представлен сравнительный анализ режимов ЭХП с применением постоянного и импульсного тока на изменение шероховатости поверхности, съема, радиуса закругления кромок и коррозионной стойкости на примере стентов из коррозионностойкой стали 316LVM. По результатам выполненных исследований установлены технологические режимы импульсного ЭХП, обеспечивающие наиболее качественное полирование поверхности стентов при малом съеме металла с незначительным скруглением кромок.

With the development of minimally invasive treatment technology, coronary stents made of corrosion-resistant steel are in demand for restoring the patency of blood vessels. The effectiveness of coronary stenting depends on various factors, but the quality of the surface of the stents is a major factor. The higher the quality of the surface of the stent is, the less negative the effect on the circulatory system, arterial walls, and the higher the biocompatibility of the stent is. The complex shape, small cross-section, size, and low rigidity of coronary stents are the main reasons for the inability to ensure high surface quality using mechanical finishing methods. Therefore, electrochemical methods are used to polish stents. For electrochemical polishing (ECP) of stents, an electric mode based on direct current is traditionally used. The disadvantages of direct current ECP are excessive metal removal and the need to use electrolytes of complex compositions, often containing toxic components. As an alternative to the traditional ECP with the use of direct current, we have proposed a method of pulsed ECP using pulses of microsecond duration for polishing stents. The use of pulsed current allows one to achieve a significant increase in the efficiency of the SEC process, when, due to the localization of the anodic dissolution, the smoothing speed of the microroughness of the treated surface, referred to the total metal removal, increases significantly. The paper presents a comparative analysis of ECP modes using direct and pulse current to change the surface roughness, removal, radius of curvature of the edges, and corrosion resistance on the example of stents made of the 316LVM stainless steel. Based on the results of the studies, technological regimes of pulsed ECP were established that provide the highest quality polishing of the stent surface with a small metal removal with a slight rounding of the edges.

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The authors declare that there are no conflicts of interest present.