Биомедицинская инженерия и электроника
Электронный научный журнал

Технические науки
MODEL OF STRENGTH OF WELDED ANASTOMOSIS OF THE SMALL INTESTINE
Berestuk K.P. 1, Lebedev A.V. 2

1. National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
2. National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

Abstract:

Experience in the use of welding of living tissues in clinical settings indicates the possibility of preventing the development of such serious consequences of the use of sutures, staples, glue, as the development of inflammatory reactions in response to the presence of foreign materials in the wound, the risk of infection of hollow organs tissues in the remote postoperative period. In the postoperative period, the welds are under heavy load from the human body. That is why it is important to assess the margin of safety that an electrowelded joint may have under load, and to characterize the allowable non-uniformity of morphological transformations to provide clinically necessary indicators of strength and tightness of the welded anastomosis. When studying the process of formation of a welded anastomosis and its further functioning, it is necessary to know the exact geometric characteristics of the seam, mechanical stresses, displacements, deformations, tissues. These values are difficult or impossible to determine experimentally due to the small volume of tissue. Therefore, the best way is computer simulation. One of the important factors in the analysis of the strength of the gut with a weld is its thickness. To determine it, the simulation of the pressure on the intestinal tissue was performed, as in welding. To simulate welding, two identical gut elements were selected, 50 mm long each, 25 mm in diameter, and 0.2 mm thick. These elements were modeled as in real circular one-step welding, with two round electrodes 3 mm thick. The wall material of the small intestine was assumed to be linear, homogeneous, isotropic and perfectly elastic (Young´s modulus for wall tissues E = 3.27 МPA, tensile strength σm = 0.9 MPa, Poisson´s ratio ν = 0.405 and density ρ = 1036 kg/ m3). Next, deformed bodies were imported from the performed welding simulations, and the geometrical characteristics of the deformed seam were measured. For models with the specified geometrical characteristics of a seam, the pressure of radial tension from 0 to 100 mm Hg with step 10. In the study of the strength of anastomoses in radial tension, it was noted that the change in the diameter of the intestine directly depends on the value of the pressure acting on it, and does not depend on the thickness of the weld.

Keywords: SolidWorks, modeling, welding of living tissues, radial tension, circular welding, small intestine

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