First Prize: Evaluation of the Tensile Strength of the Human Ureter—Preliminary Results

Abstract

The circumferential tensile strength of the ureter was found to be significantly lower than the longitudinal strength. Circumferential tensile strength was also lower with more proximal parts of the ureter. This information may be important for the design of "intelligent" devices and simulators to prevent complications.

Ureteroscopy in proximal ureteral stones after shock wave lithotripsy failure: Is it safe and efficient or dangerous?

“…13,14 The reasons for this difference may be an increased need for manipulation and auxiliary equipment, and working in a relatively weaker and narrower segment of the ureter. In addition, in recent experimental study, Shilo and colleagues 22 reported that the proximal ureter had less tensile strength, and complications tended to occur more in this part of ureter.…”

Case report series: management of complete ureteral avulsion with review of the relevant literature

“…But observance of intense inflammation in the ureter during ureteroscopy is among the important factors [15]. The presence of inflammatory tissue in proximal or distal ureter or the region where the stone was impacted forms a potential for ureteral wall rupture [16]. Added to this factor, the delicate tensile strength of the region was stated as 457.52-3374 N cm −2 in circumferential direction and as 902.43-122.08 N cm −2 in the longitudinal direction [16].…”

“…The presence of inflammatory tissue in proximal or distal ureter or the region where the stone was impacted forms a potential for ureteral wall rupture [16]. Added to this factor, the delicate tensile strength of the region was stated as 457.52-3374 N cm −2 in circumferential direction and as 902.43-122.08 N cm −2 in the longitudinal direction [16]. In our cases, the ureter, especially its distal end, was observed to be inflamed.…”

A three‐dimensional (3D) two‐way coupled fluid‐structure interaction (FSI) study of peristaltic flow in obstructed ureters

“…As seen from Figure , the rate of deformation in the ureter wall, which is an anisotropic hyperelastic material, is transferred to the fluid domain due to the FSI coupling and generates a complex flow pattern in the bolus, which could not be generated if only the fluid domain were considered or the ureter wall was modeled as a rigid surface. Also, the values of von Mises stress plotted in Figures and showed that the maximum value of the von Mises stresses was found to be around 2.5 MPa, which is well below the maximum stress of 4.1 MPa, a human ureter can withstand before failure, as reported by Shilo et al For improving convergence, the initial bulk modulus was chosen to be very high, thereby modeling it as a nearly incompressible material, a common practice for these kinds of nonlinear FSI simulations. …”