Signifikanz des biomechanischen zustandes der menschlichen ureterwände

During the last decade, the extensive use of endoscopic surgery (laparoscopy and endoscopy) has lead to the increase in the number of iatrogene ureter damages. For achievement of better result, especially, when conducting reconstructive surgery on ureter and choosing a substitute material, it is relevant to have more information about ureter wall stiffness and deformity. To investigate topographic, ate and gender differences in properties of ureter biomechanics and to test biomechanical investigation methods of ureter we examined ureter wall's biomechanical and structural morphology and its properties applying strain on the isolated samples of ureter. The examined material was obtained during surgeries while resecting ureter's segments, which were subjected to nephrectomy, nephroureterectomy or cystectomy, and had no signs of ureter pathology. Research of soft tissue biomechanics proved that the most dangerous biological load is strain, which greatly affects structural element interaction of the tissues. The following ureter wall biomechanical parameters were set, which showed tissue stiffness and deformation conditions: ultimate tension level, ultimate specific deformation energy, ultimate specific deformation energy, material elasticity module and tangential elasticity modules. The highest degree of ureter's wall stiffness and deformity is in its upper anatomical section, and lowest in the lower section. Wall rigidity, on the other hand, is of a higher degree in ureter's lower section. Ureter wall biomechanical conditions are affected by individual's age. As the organism ages, ultimate tensity and ultimate relative deformation decrease, while elasticity modules increase.