zldmЗаводская лаборатория. Диагностика материаловIndustrial laboratory. Diagnostics of materials1028-68612588-0187ООО «Издательство «ТЕСТ-ЗЛ»10.26896/1028-6861-2019-85-11-62-68zldm-1106Research ArticleИССЛЕДОВАНИЕ СТРУКТУРЫ И СВОЙСТВ. МЕХАНИКА МАТЕРИАЛОВ: ПРОЧНОСТЬ, РЕСУРС, БЕЗОПАСНОСТЬTESTING OF STRUCTURE AND PARAMETERS. MECHANICAL TESTING METHODSУстановка для определения усталостной долговечности внутрисосудистых стентовDevice for determination of the fatigue durability of intravascular stentsКашинО. А.KashinO. A.

Олег Александрович Кашин

634055, Томск, просп. Академический, 2/4

Oleg A. Kashin

Pr. Akagemichesky, 2/4, Tomsk, 634055

КруковскийК. В.KrukovskiiK. V.

Константин Витальевич Круковский

634055, Томск, просп. Академический, 2/4

Konstantin V. Krukovskii

Pr. Akagemichesky, 2/4, Tomsk, 634055

kvk@ispms.tsc.ruБобровД. И.BobrovD. I.

Дмитрий Иванович Бобров

634055, Томск, просп. Академический, 2/4

Dmitrij I. Bobrov

Pr. Akagemichesky, 2/4, Tomsk, 634055

ЛотковА. И.LotkovA. I.

Александр Иванович Лотков

634055, Томск, просп. Академический, 2/4

Aleksandr I. Lotkov

Pr. Akagemichesky, 2/4, Tomsk, 634055

Институт физики прочности и материаловедения, СО РАНРоссияInstitute of Strength Physics and Materials Science, SB RASRussian Federation20192811201985116268Copyright © Кашин О.А., Круковский К.В., Бобров Д.И., Лотков А.И., 20192019Кашин О.А., Круковский К.В., Бобров Д.И., Лотков А.И.Kashin O.A., Krukovskii K.V., Bobrov D.I., Lotkov A.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.zldm.ru/jour/article/view/1106

Для восстановления просвета стенозированных кровеносных сосудов используют металлические стенты, которые после имплантации пожизненно остаются в организме человека. Необходимые условия успешного использования таких имплантатов — высокие значения их усталостной прочности и долговечности. Устройства по определению усталостной долговечности стентов чаще всего основаны на использовании изменения диаметра полимерной трубки, имитирующей кровеносный сосуд, в которую помещен стент соответствующего диаметра. Установки по определению усталостной долговечности стентов в основном представлены зарубежными фирмами и имеют высокую стоимость. Авторами разработана сравнительно простая и недорогая исследовательская установка, в которой циклическое нагружение реализуется по схеме «изгиб с вращением». Для проведения испытаний стент помещают внутрь силиконовой трубки, диаметр которой соответствует диаметру кровеносного сосуда, в котором будет установлен данный стент. Концы трубки закрепляют на вращающихся валах, расположенных в подшипниках. Перемещая один из подшипников, можно менять радиус изгиба трубки R и, соответственно, степень деформации элементов стента. Платформу со стентом размещают в резервуаре, заполненном физиологическим раствором. Внутри резервуара посредством радиатора поддерживают постоянную температуру. Частоту вращения варьируют до 60 Гц, одновременно можно испытывать пять стентов. В процессе испытаний реализуется циклическое нагружение с коэффициентом асимметрии цикла, равным –1. На изготовленной установке проведены контрольные испытания саморасширяющихся стентов из сплава на основе никелида титана двух типоразмеров: первый — диаметром 8 и длиной 60 мм, второй — диаметром 4 мм и длиной 30 мм. Температура физиологического раствора — (37 ± 2) °C, частота вращения вала — 50 Гц. Радиус изгиба R » 250 мм. Испытания показали, что разработанное устройство может быть эффективно использовано для проведения ускоренных усталостных испытаний стентов.

Metal stents used to restore the lumen of stenotic blood vessels remain in the human body for life after their implantation. Their high fatigue strength and durability are necessary conditions for the successful use of the implants. Devices intended for testing the fatigue durability of stents are most often based on using a polymer tube of changeable diameter which imitates the blood vessel into which the stent of the corresponding size is placed. The devices are often foreign made and rather expensive. The authors developed a relatively simple and not expensive research facility in which cyclic loading is realized by «rotating bending» scheme. A stent is placed inside the silicone tube having the diameter corresponding to that of the blood vessel in which the stent will be installed. The ends of the tube are fixed on the rotating shafts, which in turn are located in the bearings. Moving one of the bearings changes the bending radius of the tube R and, accordingly, the degree of deformation of the stent elements. The platform with the stent is located in the tank filled with saline solution. A radiator maintains a constant temperature inside the tank. The rotation frequency can be varied up to 60 Hz, five stents can be tested simultaneously. Cyclic loading is realized with a stress ratio equal to 1. We have tested two typical sizes of self-expanding stents made of the alloy based on titanium nickelide: the first being 8 mm in diameter and 60 mm in length, and the second one — 4 mm in diameter and 30 mm in length. The temperature of the saline solution was (37 ± 2)°C, the rotation frequency of the shaft — 50 Hz. The bending radius was R » 250 mm. Tests showed that the developed device can be effectively used for accelerated fatigue tests of stents.

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