EVALUATION OF STRENGTH CHARACTERISTICS OF CORONARY STENTS IN THE CREATED MODEL OF “MYOCARDIAL BRIDGE”

Abstract

Introduction. Presently there is no unified tactics to treat patients with aberrantly localized coronary arteries of “muscular bridge” type. There are controversial data regarding the benefit of coronary artery stenting due to often stent breakage or perforation of tunneled vessel. There are no major randomized studies regarding this issue. In this regard the goal of this research was to assess strength characteristics of stents in the model of muscular growth that we restored.Materials and methods. The originally developed model enabled to determine the strength limit of coronary stents under conditions that are maximum close to the physiological ones. The stents were placed into a polytetrafluoroethylene tube, the bridge-imitating oscillation frequency was configured to 250 beats per minute. The results of the experiment were recorded on USB-camera each 30 minutes in order to register mechanical defects of the stent.Results and discussion. The stent consisting of cells that are joined with V-shaped connections, showed first signs of strut deformity on the 10th day. Complete breakage happened on the 17th day after implantation. After 2 months observation the stent preserved mechanical firmness without V-shaped connections.Conclusion. Thus, it is not quite correct to support the hypothesis on infeasibility of stent implantation into the coronary artery with a muscular bridge. Taking into consideration the findings it is possible to suppose that the structure, design, form and content of stents predetermine the possibility to implant it into coronary artery with muscular bridge, but require individual approach to every particular patient.

Keywords

• мышечные мосты
• ишемическая болезнь сердца
• коронарные стенты
• биологические модели