METHOD OF SIMULATING PRODUCT INSTALLED INTO LUMEN OF HOLLOW ORGANS TO EXPAND AREA NARROWED BY PATHOLOGICAL PROCESS Russian patent published in 2023 - IPC A61F2/00 G06F30/10 G06F30/17 G06F30/23 

FIELD: medical equipment.

SUBSTANCE: invention relates to a method of modeling a product installed in the lumen of hollow organs to expand an area narrowed by a pathological process. The method includes selecting a product design for further modeling. The method includes determining the characteristics of the product material by performing load tests on the workpieces. The method includes two-dimensional modeling of the component elements of a product using the finite element method to obtain the geometric configuration of the component elements of the product, in which stress concentrators are created in the internal corners of the component elements. The corners of the component elements are made with elliptical rounding. The method includes constructing a three-dimensional model of the product, using two-dimensional models of the component elements of the product with a geometric configuration, for the spatial arrangement of these elements and obtaining the geometric parameters of the product while maintaining the stress-strain characteristics of the component elements. The method includes modeling of the stages of the product throughout the entire operating cycle, obtained as a result of modeling at the previous stages. The method involves obtaining a model of a product installed in the lumen of hollow organs to expand the area narrowed by the pathological process. The method includes solid modeling of a product for its further manufacture. Stages of the product throughout the operating cycle include the product without load in the manufactured state, the product installed on the delivery system balloon, the product expanded to its nominal size, the deployment of the product intended to expand the area narrowed by the pathological process using a balloon larger than the balloon nominal size, product opened until the component elements of the product are destroyed. Modeling of the stage of a product installed on a delivery system balloon includes compression of the product onto a catheter model, taking into account the elastic radial rebound of the product after compression on the balloon catheter and the accumulation of stresses in the component elements of the product as a result of their deformation.

EFFECT: obtaining an optimal design of a product installed in the lumen of hollow organs to expand the area narrowed by the pathological process, obtain an optimal geometric configuration of stress concentrators in the internal corners, eliminate bulging in the radial direction during expansion and use of the stent in a vessel, and increase the ability of the stent to resist expansion additional load from the vessel on the distal part of the stent with minimal shortening of the stent during expansion.

10 cl, 8 dwg, 6 tbl